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    Earth Surface Processes
  • Earth Surface Processes
    HUANG Jin-chuan, SUN Gui-yan, YAN Mei, LIU Tao, XIAO Lei
    2012, 31(8): 1355-1364. https://doi.org/10.11821/yj2012080001
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    According to GDP(without agriculture) data of all the 661 cities in China,this paper integrates the methods of spatial autocorrelation and urban field strength,and analyzes the space-time evolution of urban field strength and spatial autocorrelation.It is concluded that huge cities such as Beijing and Shanghai,have formed the circle structure of urban influence on the whole country.More mega cities have regional-wide influence,such as Wuhan,Zhengzhou,Chongqing and Chengdu.Many big cities only have local-wide influence,and are forming a multi-center structure.Cities in coastal areas have much greater influences than those in inland areas.Besides,there are significant connections and interactions among cities in large megalopolises.The largest three megalopolises or urban agglomerations,i.e.,Pearl River Delta,Yangtze River Delta and Beijing-Tianjin-Hebei region,have developed rapidly.The regional patterns of urban agglomerations,such as southern Liaoning and Shandong Peninsula,have already emerged.However,there are weaker correlations among the cities in inland areas which are in independent status.Although the patterns of influence of cities in China varied slowly,great changes have taken place.With the booming economy,the regions affected by urban expansion have accelerated the development of related urban agglomerations.
  • Earth Surface Processes
    LIU Sheng-he, LAN Xiao-xiong, FAN Jie
    2012, 31(8): 1365-1374. https://doi.org/10.11821/yj2012080002
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    China has been rapidly constructing its major transportation infrastructure such as high-speed railway and highway,waterway,which have great impacts on regional city development and urban system planning,so it is urgently needed to explore the impact evaluation method and to conduct empirical case studies.By taking Xijiang waterway development as a case study with AHP method,this paper firstly puts forward an impact evaluation index system consisting of 13 indexes in 4 aspects such as the improvement of regional economic location,the improvement of water transport capacity,the improvement of regional comprehensive transportation conditions and the potential of industrial development.Then,the differential impacts of Xijiang waterway exploitation on city development in sub-areas have been evaluated by using this index system.The results are shown as follows.(1) The impacts of Xijiang waterway development on city development are strongly concentrated on the axis of Xijiang riverside and are also different in different sub-areas.Thus,different sub-areas within Xijiang economic region should adopt different urbanization development strategies.The eastern sub-area should rapidly develop the city corridor along the Xijiang mainstream,the central sun-area should actively develop the metropolitan areas such as Nanning Metropolis,and the upstream sub-area should mainly develop characteristic cities.(2) Xijiang waterway development also has strong impacts on the regional urban system and its spatial structure planning.By conducting comprehensive comparison among the three spatial models such as the "Central Radiation" model,the "Golden Triangle" model and the "Reverse-T" model pattern,this paper concludes that the "Central Radiation" model,which is proposed by the "Guangxi Urban System Planning(2006-2020) ",is no long suitable,and the latter two models or their combination are more suitable.
  • Earth Surface Processes
    WANG Chen, George C. S. LIN, DAI Shi-xu
    2012, 31(8): 1375-1386. https://doi.org/10.11821/yj2012080003
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    In recognition of the heated theoretical debate over the relationship between industrial cluster and technological innovation,this paper examines the growth,spatial distribution and innovative performance of China's electronics and information industry to understand the cluster-innovation relationship.The data analysis at the provincial level has found that there is no positive relationship between industrial cluster and technological innovation in the electronics and information industry.A survey in the Shenzhen-Dongguan area—one of the most clustering area of the electronics and information industry in China reveals that geographical proximity failed to induce the sense of trust among firms,stimulate knowledge spillover and facilitate the innovative acitivities,despite the existence of intensified local production linkages among co-located firms.Most of surveyed firms have engaged in "periphery innovation" that does not involve complicated technologies and thus they have no desire to seek external cooperation and collaboration based on R&D activities.This paper concluded with a plea that we should place much emphasis on the nature and characteristics of individual firms and clusters under special political,social and institutional contexts rather than on the "relations" among the firms.
  • Earth Surface Processes
    WANG Zhen-bo, FANG Chuang-lin, XU Jian-gang, WU Xi-wei
    2012, 31(8): 1387-1398. https://doi.org/10.11821/yj2012080004
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    Sustained and intensive human activities have significant impacts on the health and security of ecosystems.Although the main functional zoning has been integrated into the national strategy and the ecological direction of China's regional planning has been clear,the classification method,which divides areas based on administrative function,does not obey the laws of ecosystem integrity.Given the understanding of the relationship between natural laws and human activities,this paper,which takes the 30m DEM of the basin-wide Huaihe River as data basis,introduces the laws of watershed ecosystem integrity into the theory of main functional zoning,and takes four sub-basins of the Huaihe River Basin as research units.Division of basin space development is conducted on condition of evaluation index system and 3D discriminate matrix in spatial development constraints,spatial development intensity and spatial development guidance.The results are shown as follows.(1) Introducing watershed ecosystem integrity law into ideological system of main function division has great theoretical value,and taking Huaihe River Basin as a case to explore space development division has great practical significance.(2) Based on digital topographic map(30 m) and hydrological model,the Huaihe River basin was classified as the fourth stage sub-watershed with scientific codes successfully.(3) The evaluation index system of river basin spatial development division is constructed by integrating various models and operation methods of ArcGIS platform.(4) The Grid Based Method used in this paper can not only reflect the cover features of basin more accurately and scientifically but also remove the administrative data limits,moreover the integrity of the basin ecosystem will be reflected more clearly.(5) The Huaihe River Basin is divided into five types based on the three-dimensional quadrant analysis,namely the important exploitation area,the optimum exploitation area,the agricultural development area,the limited exploitation area and the prohibited exploitation area.Finally,this paper presents the scheme of industrial restructuring.It also provides a scientific basis for making different industrial policies as well as harmonizing the industrial development and the bearing capacity of watershed ecosystem.
  • Earth Surface Processes
    SONG Zhi-jun, LIU Li-ming
    2012, 31(8): 1399-1410. https://doi.org/10.11821/yj2012080005
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    The spatial structures of five types of cultivated land with various economic attributes in Beijing are analyzed in this paper based on natural attributes in the context of harmonious development of urban and rural functions.The spectrum analysis shows that the layout of different types cultivated land has different periodicity,and that they together form the spatial structure of macroscopic suburban agriculture,about 23-44 km(suburban plain),44-66 km(exurb plain),66-126 km(mountain) from Tian'anmen.Based on this analysis,the paper calculates the spatial dimension and Hurst index of four cultivated land types,and argues that the cultivated lands of landscape greening area,beautified farmland area and the 22-47 km circle of suburban mountainous areas do not have fractal characteristics.The development of scale farmland area is affected by distance,and landscape corridor belt is impacted by urban development,and the 48-126 km circle of central suburbs and mountainous areas is affected by natural conditions.The fractal characteristics of the cultivated lands of the three are obvious.On the whole,cultivated land in Beijing is in a discrete-continuous and commensurability-incommensurability integration status.
  • Earth Surface Processes
    DONG Cheng-wei, RUI Xiao-ping, DENG Yu, GUAN Xing-liang
    2012, 31(8): 1411-1421. https://doi.org/10.11821/yj2012080006
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    There are more than three attributes in economic statistical data generally.When studying the inherent structural characteristics of these data such as clustering and distribution,researchers need to reduce multi-dimensional information to three-dimensional space or less to achieve multi-dimensional visualization.There are multi-dimensional reduction methods,whose results are different from each other because of different mathematics theories and application ranges,and the visualization results of these methods will vary.So evaluation of different methods can provide important references for the selection of methods in different areas.In the paper,the authors analyze economic statistical data of Sichuan province in 2007 based on county-unit by implementing four commonly used algorithms: the linear method PCA,nonlinear method NLM and SOFM,and a supervised classification method SVM,then obtain a series of classification results.Considering the status of economic development in Sichuan,the authors analyze the differences between the results of these methods,and draw some conclusions as follows.Although PCA can reveal the overall development trend,the result is not consistent with the real condition in Sichuan;NLM can well show the regional trend and core areas of economic development in Sichuan,and account for the development status;SOFM can also show the development status,but there are several classification errors in the northeastern part of the region.It is impossible for comparison within each cluster;as a supervised method,SVM needs a known sample set to train the classification process,which makes the sample selection subjective,and the search process for optimal parameters is complicated.The comparison of these methods and their application in economic statistics fields can provide a reference for the future relevant spatial dimension-reduction research.
  • Earth Surface Processes
    LIANG Liu-tao, YANG Jian-tao
    2012, 31(8): 1422-1430. https://doi.org/10.11821/yj2012080007
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    This article calculated tourism industry efficiency of China in 1999-2008 using the method of data envelopment analysis(DEA),which could set multi input and output indexes,avoiding inadequacy of using only one input and output index.Then it classified the tourism industry efficiency into two categories,pure technological efficiency and scale efficiency for seeking the cause of diverse land production efficiency.The results suggest the following.(1) The tourism industry efficiency fluctuated in 1999-2008,with the average being 0.330,indicating that tourism industry efficiency was low.(2) Tourism industry efficiency was different among 31 provinces in China.A few provinces in eastern China had high tourism efficiency,while some provinces in central China and western China had lower efficiency.(3) Tourism industry efficiency and pure technological efficiency had the same changing trend,which showed that the changes of tourism industry efficiency were mainly due to pure technological efficiency.(4) Almost all the provinces had an increasing trend.
  • Earth Surface Processes
    CAO Fang-dong, HUANG Zhen-fang, WU Jiang, XU Min
    2012, 31(8): 1431-1444. https://doi.org/10.11821/yj2012080008
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    With the help of DEA model and ArcGIS spatial analysis module,the paper systematically analyzes the evolution of temporal and spatial pattern of urban tourism development of Pan-Yangtze River Delta from 1998 to 2008.According to the change decomposition model of total factor productivity(Malmquist index),it comprehensively discusses the evolutionary process of overall trend of TFP change,structure and the temporal and spatial pattern.The results show that the urban tourism development efficiency of Pan-Yangtze River Delta has presented an increasing trend and characteristics of urban difference display a distinct fluctuation.Formation and evolution of the spatial pattern of tourism development efficiency have the spatial relationship.Overall efficiency,pure technical efficiency and scale efficiency have a significant spatial autocorrelation,at the same time overall efficiency and scale efficiency have formed a similar changing pattern.However,the change of total factor productivity displays weak clustering and the correlation of adjacent geographical units is not good.Autocorrelation and its change of tourism development efficiency cause the spatial unbalance of tourism development efficiency to a large extent.Therefore,the spatial cost effect made by location in the process of tourism development is more distinct and the characteristic of geographical space plays a crucial role in the process of tourism development efficiency.The analytical result of the driving mechanism of temporal and spatial pattern evolution of tourism development efficiency shows that the three driving aspects of economic policy orientation,tourism production unit value and tourism consumption demand stimulus lead to the spatial pattern replacement of tourism development efficiency.
  • Earth Surface Processes
    SUN Cai-zhi, TANG Wei-jia, ZOU Wei
    2012, 31(8): 1445-1455. https://doi.org/10.11821/yj2012080009
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    The assessment indicator system for water poverty conditions measure in rural areas of China was constructed firstly.Each index of the system was given a weight by the subjective and objective comprehensive weighting method.Then the water poverty index model(WPI model) was applied to measure the rural water poverty conditions of 31 provincial administrative units in China from 2004 to 2009,and the results can basically reflect the spatial distribution pattern of rural water poverty in recent years.The provinces with high rural water poverty are Ningxia,Hainan,Tianjin,Gansu,Shanxi,Jilin,Chongqing,Xinjiang,Guizhou,and Inner Mongolia;the provinces with moderate rural water poverty are Shaanxi,Qinghai,Shanghai,Liaoning,Fujian,Heilongjiang,Anhui,Beijing,Jiangxi,Hubei,and Hebei;the provinces with low rural water poverty are Guangxi,Yunnan,Henan,Zhejiang,Hunan,Shandong,Jiangsu,Guangdong,Sichuan and Tibet.Finally,this paper studied the forming mechanism of spatial distribution pattern of rural water poverty,and some relevant countermeasures and suggestions were put forward for solving the water poverty problems in rural areas of China,which is helpful for providing strategic basis for decision making and policy enlightenment for achieving the coordinated growth of issues related to agriculture,farmers and rural areas.
  • Earth Surface Processes
    QIN Li-jie, JIN Ying-hua, CHANG Yong-zhi, ZHANG Hui
    2012, 31(8): 1456-1464. https://doi.org/10.11821/yj2012080010
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    Virtual water is an important research field of food security and water security,and the current research is mainly concentrated on the calculating methods of virtual water content,national or regional virtual water flow and the practicing significance of virtual water strategy,in other words,they mainly focus on macro and middle scales,seldom on micro level.In order to discuss the micro study of virtual water,we developed the field experiments of maize virtual water under different tillage methods in the west of Jilin Province during 2005-2007.There are 6 tillage methods which are 65-cm ridge stage,65-cm ridge furrow,43-cm ridge stage,43-cm ridge furrow,98-cm double-row ridge stage and 130-cm triple-row ridge stage.The optimal tillage method for maize can be confirmed by comparing the maize virtual water content per unit weight and its stability under the 6 kinds of tillage methods.Thereby,high efficient utilization of water resources can be realized and a new idea can be provided for solving the problem of water shortage.Through three years of field experiments,98-cm double-row ridge stage is considered to be the best tillage method,in which the maize virtual water content per unit weight was lower with small fluctuation,especially the least virtual water in extreme drought year.Therefore,it is suggested that maize tillage method should be changed from 65-cm ridge stage to 98-cm double-row ridge stage in the study region.
  • Earth Surface Processes
    GONG Tian-yu, SHAO Quan-qin, LIU Ji-yuan, SUN Chao-yang, CAO Wei
    2012, 31(8): 1465-1478. https://doi.org/10.11821/yj2012080011
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    In this article we have analyzed the impact of land cover types on climate warming in southern China based on observation data of 136 reference meteorological stations from China Meteorological Bureau in Southern China,the 1:100000 national land cover data from the 1980s to 2005 and NCEP/DOE AMIP-ⅡReanalysis.We extracted the underlying surface of 3-km radius buffer zones around the meteorological stations in different historical periods,and distinguished the observational environment of the meteorological stations.Then,annual,seasonal and monthly changes of air temperature are analyzed.We compared the difference of temperature change at meteorological stations with different observational environments which are respectively cropland,built-up land and woodland,and drew some conclusions about the impact of land cover types on climate warming in southern China.The result shows that,in southern China,among the three main types of land cover in the study area,the changing trends of the annual average,annual average maximum and the annual average minimum temperature in built-up areas are most significant,while those in cropland area are moderate,and those in forest area are least significant.By analysis of OMR values which are observed minus data of NCEP/DOE AMIP-ⅡReanalysis,we found that the changing trend of annual average temperature in built-up land is still most significant(0.105℃/10a),followed by cropland area(0.056℃/10a),and forest area(-0.025℃/10a).So,it is concluded that forest plays an inhibitory effect in climate warming,while built-up land and cropland play an enhanced effect,and urban areas enhance the climate warming more than cropland.We also conclude that the changing trends of average seasonal and monthly temperature in woodland are less significant than those of any other land cover types.
  • Earth Surface Processes
    ZHU Xin-yu, LIU Jie, SHI Ben-lin, ZHANG Yi
    2012, 31(8): 1479-1489. https://doi.org/10.11821/yj2012080012
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    Global climate change has significant impacts on agricultural production.Climate variability adversely impacts crop production and imposes a key constraint on agricultural production,mostly on how to enhance the yields of winter wheat,across the world.Owing to the fundamental importance of food to human welfare,crop and livestock production,we used the data of winter wheat experimental field and meteorological data of eight agrometeorological experiment stations and agrometeorological observation stations from 1991 to 2010 to establish the models of climate suitability.The variation of climate suitability in the whole growth period from 1971 to 2010 was analyzed.The results showed that the suitability degrees of temperature,sunshine,precipitation and integrated index were 0.54,0.64,0.37 and 0.50 respectively during the whole growth period of winter wheat.The sunshine suitability degree was the best,temperature suitability degree took the second place and the precipitation suitability degree was the worst.It is indicated that precipitation is the major limiting factor affecting winter wheat growth and development.It was shown that the temperature and precipitation suitability degrees decreased by 0.001 every year and sunshine suitability degree decreased by 0.002 every year from 1971 to 2010.The weaken combination effects of temperature,sunshine and precipitation were unfavorable for the growth of winter wheat.The temperature,sunshine and precipitation suitability degrees were weaker and these factors had poor combination effects in sowing to emergence period from 1971 to 2010.The precipitation suitability degree was good,sunshine and temperature suitability degrees were weaker in emergence to jointing period of winter wheat.In jointing to milk period of winter wheat,temperature and sunshine suitability degrees were good,and precipitation suitability degree was weak;and the combination of climate factors tended to be better.The sunshine and precipitation suitability degrees were good,temperature suitability degree was weaker in milk to maturity period of winter wheat;and the integrated climate suitability degree began to deteriorate.Per unit yield of winter wheat had a significant correlation with sunshine,temperature and precipitation suitability degrees in the middle-late growth period of winter wheat.
  • Earth Surface Processes
    SHAO Jing-an, SHAO Quan-qin, LU Qing-shui, HUANG Lin, KUANG Wen-hui
    2012, 31(8): 1490-1502. https://doi.org/10.11821/yj2012080013
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    This paper emphatically analyzed the significance of ecological adaptation of the preferences of farmers and herdsmen to government leading ecological construction projects in Mountain-River-Lake of Jiangxi Province and Three-River Headwaters of Qinghai Province,using the methods of participatory rural appraisal,existing literatures and ecological time.The results indicated that the preferences of farmers and herdsmen involved maximum economic benefit,continuous production means,and sustainable belief and custom.They were the stable forces to determine whether government leading ecological construction was carried out successfully and obtained expected effects or not.Some of them could provide new ideas and directions for the arrangements or further appropriate adjustment of ecological adaptation strategies.And some of them could be used to restore or reconstruct impaired ecological basement,as they were sound practices and actions for ecological construction themselves.However,in Mountain-River-Lake,farmers' preferences finally presented the pursuit of maximum economic benefit.They were easily used for the adaptive policy arrangement of mountainous ecological reconstruction.In Three-River Headwaters,herdsmen's preferences were still in the framework of belief and custom.They were difficultly changed for the adaptive measure design of pasture restoration.Moreover,the former can be converted to more active adaptive participation,while the latter is still more passive,when appropriate guidance measures are taken.
  • Earth Surface Processes
    XU Li-rong, LUO Kun-li
    2012, 31(8): 1503-1511. https://doi.org/10.11821/yj2012080014
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    Fluorine is widely distributed in rocks,which are the ultimate sources of fluorine in the environment.So it is necessary to study fluorine distribution in rocks especially in fluorine poisoning areas.The Daba mountainous region has severe endemic fluorosis.Most of outcropping bedrocks have high F content,about several times to tens of times greater than the average in the earth crust.Furthermore,strong weathering in the Daba region,which has a typical subtropical monsoon climate with rich heat and rainfall and landform characterized by mountains and hills,resulted in close relations between weathered bedrock and human health. In this paper,the F content and distribution in the strata of the Daba region are studied,particularly F-rich strata.The results show that the Early Paleozoic strata in this region are all rich in fluorine at large.Fluorine content is mostly more than 800 mg/kg in carbonaceous slate,black shale and phosphate rock of Lower Cambrian Lujiaping Formation.Fluorine content is also high in carbonaceous slate of Lower Silurian Daguiping Formation(more than 1500 mg/kg),and the forementioned strata are classified into the high-fluorine zones in the Daba region.Fluorine contents of Ordovician and other formations of Mid-Lower Silurian strata are also higher than the average in the earth crust(550 mg/kg) but lower than 800 mg/kg.Fluorine contents of Neoproterozoic,Lower Cambrian Jianzhuba Formation and Mid-Upper Cambrian strata are generally lower than 500 mg/kg,which are classified into the low-fluorine zones in the Daba region. The fluorine content of stone coal of Early Paleozoic in the Daba region is generally much higher than the average fluorine content of Chinese coals.The highest fluorine content of stone coal occurs in Lower Silurian Daguiping Formation,the next in Lower Cambrian,and the lowest in Mid-Upper Cambrian and Ordovician stone coal.Most Chinese stone coals are high-fluorine coals(>800 mg/kg),which are widely distributed in southern China short of ordinary coal resource,where stone coal is used as a local household fuel easily to be exploited,so the usage of stone coal with high F concentration has brought severe fluorosis for local people.
  • Earth Surface Processes
    LIN Yi-gang, LIU Zhi-wei
    2012, 31(8): 1512-1522. https://doi.org/10.11821/yj2012080015
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    The activities of folks greatly influenced the environmental changes,and the folk environmental awareness plays important roles in the changes as well.Thus,the studies on people's cognitions on environment will contribute to the further research on the process of environmental changes.However,the folk environmental consciousness of the current academic research is the weak part. Many articles are focused on protecting environment in stone carvings of folk conventions of Yunnan Province,including people's cognition on the relation between environment and aesthetic appreciation,people's cognition on the relation between environment and geomantic omen,people's cognition on which forests conserve water sources and soil.The authors collect and analyze 84 stone carvings of folk conventions.The development process of Yunnan folk environmental awareness is divided into six stages: germination stage,development stage,peak stage,trough stage,recovery stage and decent stage.The distribution from the perspective of time of stone carvings of folk conventions and the changes of folk environmental conventions are synchronized.Before the Qing Dynasty,Yunnan had high vegetation coverage,sound natural environment and relatively low population density.Moreover,people in this area hardly did anything to damage the natural environment.So the problems of environmental protection did not attract people's attention.Then after the Qing Dynasty,with the greater pressure of population,the gradual damage of vegetation caused by economic development and the disorder of the society,production and life suffering from wars,the folk environmental conventions of Yunnan has been growing gradually.Seen from the spatial perspective,the environmental-protecting stone carvings of folk conventions of Yunnan are characterized by wide-spreading and relative centralizing.They are mainly distributed in areas such as Yuxi,Dali,Chuxiong,Wenshan and Kunming.These areas have a long history of economic development,dense population,high-developed industry and agriculture.Meanwhile,their forests have been degraded seriously.
  • Earth Surface Processes
    CAI Qing, ZENG Guang-ming, SHI Lin, LIANG Jie, HUANG Lu, WEI An-lei
    2012, 31(8): 1523-1534. https://doi.org/10.11821/yj2012080016
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    Ecological corridor,which plays an important role in biodiversity protection,is defined as a stretch of nature mosaic that facilitates the migration of animals.Many GIS software packages use raster cost surface to identify the path of least resistance between source and destination.Limitation of these methods is that only a single path can be identified.However,ecological corridors should be more complicated and more redundant.Many alternative paths with less cost might exist in fact for animals may not choose the optimum path when moving between different habitats.In this paper,a new approach based on Spatial Analyst Tools of ArcGIS using raster data is proposed to identify the redundant routes.Firstly,the resistance cost surface moving from source to adjacent raster was defined.Secondly,the accumulated least-cost raster from both source and destination habitat to any other raster on the cost surface was evaluated.Two accumulated least-cost raster were added by raster calculation module.The value of the added raster is the accumulated least-cost which passed the current raster.Thirdly,the corridor was obtained by extracting the added raster with a certain value.Corridors of six simulated landscape patterns with different spatial autocorrelations were used to assess this procedure.The results showed that the corridors obtained by the procedure include not only the optimum path,but also some sub-optimum paths.The corridor is redundant and fit for describing the migration behavior of animals.Lastly,the identification of the ecological corridors in West Bank Pilot Planning Area of Changsha was taken as an example.The results showed that eleven key habitats existed in the study area.Corridors of twenty adjacent habitat pairs were analyzed.The results showed that all the corridors were of certain width and some of the corridors had furcation or even bypath.However,there are some bottlenecks in some corridors,which become the key zone for the ecological restoration.
  • Earth Surface Processes
    LIU Zhen-huan, WANG Yang-lin, PENG Jian
    2012, 31(8): 1535-1545. https://doi.org/10.11821/yj2012080017
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    Rapid urbanization has changed urban land cover characteristics.Impervious surface has been the main land cover categories in urban landscape.How to quantify the spatial pattern of impervious surface and its temporal change are necessary for us to understand the dynamics of processes and patterns of urban landscape and their relationship between impervious surface and other heterogeneous landscapes.Remote sensing technology has been widely applied in urban impervious surface monitoring and change detection,but the spatial pattern and temporal change of impervious surface is rarely concerned.Taking Shenzhen as a case study area,we quatify the spatiotemporal patterns dynamics of impervious surface from 1990 to 2005.In order to analyze the spatial temporal change of impervious surface,we used an index of impervious surface area to show the heterogonous of impervious surface by linear spectral mixture method,which can be divided into six cover degrees.We use the matrix change method to explain the changes among four time periods and 3 stages and landscape pattern metrics to indicate the pattern change at three different levels.Results show that there were three changing types in the 15 years,namely,high and full density impervious surface area(HDISA,FDISA respectively)-continued increasing,and medium density(MDISA) and low density(LDISA)—first increased and then decreased,while natural surface(NOISA) and very low density(VLISA) are contrary to MDISA and LDISA.However,the pattern of impervious surface indicates that cover degrees had a high landscape diversity and the value changed from low to high then decreased and reached a new high level.The landscape aggregation was very low overall in the four time periods,but had a significant fluctuation in classes level.The patches shape shows that natural surface had a high dominant position in 1990,but after that changed to medium density impervious surface and high density overtook the second position after 2005.Our research can provide a basis for the orderly development for planning urban impervious surface extension and aggregation;however,we also believe that mitigating the expansion of impervious surface is benefit to the improvement of the urban ecological and environmental quality.