基于SPOTNDVI的华北北部地表植被覆盖变化趋势

doi:10.11821/yj2008040003

地理研究 ›› 2008, Vol. 27 ›› Issue (4): 745-755.doi: 10.11821/yj2008040003

基于SPOTNDVI的华北北部地表植被覆盖变化趋势

张月丛^1,2, 赵志强¹, 李双成¹, 孟宪锋²

1. 北京大学城市与环境学院,北京 100871;
2. 承德民族师专,承德 067000

收稿日期:2007-12-10 修回日期:2008-04-16 出版日期:2008-07-25 发布日期:2008-07-25
作者简介:张月丛(1964-),女,河北省无极县人,副教授。主要从事自然地理学教学和科研工作。 E-mail:zirandili2006@163.com
基金资助:
教育部科学研究重大项目(306019)和国家自然科学基金项目(40771001)资助

Indicating variation of surface vegetation cover using SPOT NDVI in the northern part of North China

ZHANG Yue-cong^1,2, ZHAO Zhi-qiang¹, LI Shuang-cheng¹, MENG Xian-feng²

1. College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;
2. Chengde Teachers College for Nationalities,Chengde 067000, China

Received:2007-12-10 Revised:2008-04-16 Online:2008-07-25 Published:2008-07-25
Supported by:
教育部科学研究重大项目(306019)和国家自然科学基金项目(40771001)资助

摘要/Abstract

摘要：

为分析华北北部地表植被覆盖变化趋势,探寻合理土地利用方式,基于1999年1月至2006年12月的SPOT-VEGETATION逐旬NDVI数据,采用国际通用的MVC(最大合成法)获得月NDVI值,用均值法求出年均NDVI数值。在此基础上,用一元线性回归斜率定量描述地表覆盖动态变化,以Hurst指数表示其时间依存性,利用GIS工具表征其空间格局并进行空间统计分析。研究结果表明:近8年来华北北部地表植被覆盖整体得到改善的区域比植被覆盖退化的区域面积大,得到改善的区域约占总面积的66.04%,基本不变的区域约占14.39%,退化区域约占19.57%。各种土地利用类型Hurst指数平均值均为0.5

关键词: NDVI, Hurst指数, 地表植被覆盖, 变化趋势, 华北北部

Abstract:

To investigate dynamics of surface vegetation, and optimize regional land use structure and pattern, monthly and annual NDVI were computed respectively by using maximum value composites and average method with 10-day NDVI of SPOT-VEGETATION from Jan. 1999 to Dec. 2006, and then variation of surface vegetation cover and its temporal dependence were indicated by the slope of one-variable linear regression and Hurst exponent. The results show that the greening area is larger than the degraded area in the northern part of North China as an indicator of positive or negative slope of NDVI series. The greening area, stable area, and degraded area account for 66.04%, 14.39% and 19.57% of the total area respectively. The dynamics of surface vegetation cover shows significant regional differentiation. For example, vegetation cover would show the decrease trends in transitional zones among Hebei Province, Shanxi Province and Inner Mongolia Autonomous Region, while persistent increase of vegetation cover appears in the Taihang Mountain, Yanshan Mountain and Luliang Mountain. The fact that Hurst exponents of the NDVI time series greater than 0.5 suggests NDVI series are generally persistent and a rising tendency in the past will cause possible increase in the future. So, the variation of surface vegetation cover in cropland, woodland, and built-up area would show the increasing tendency, while grassland would appear a possible decrease. Moreover, dynamics of surface vegetation exhibits obvious difference in different land cover types. The stability of coniferous forest ecosystem is larger than the deciduous broadleaf forest and shrub vegetation, while the stability of grassland vegetation is lower than the forestland system. Influencing factors of vegetation cover such as temperature, precipitation and evaporation differ in different elevations, and so the stability of ecosystem variation presents altitude differences. To increase the sustainability of regional agro-forestry ecosystems, more natural factors should be considered above 1000 m, while much more attentions have to be paid to the anthropic factors below 1000 m in landuse planning according to the research results.

Key words: NDVI, Hurst index, surface vegetation cover, Variation, Northern Part of North China

张月丛, 赵志强, 李双成, 孟宪锋. 基于SPOTNDVI的华北北部地表植被覆盖变化趋势[J]. 地理研究, 2008, 27(4): 745-755.

ZHANG Yue-cong, ZHAO Zhi-qiang, LI Shuang-cheng, MENG Xian-feng. Indicating variation of surface vegetation cover using SPOT NDVI in the northern part of North China[J]. GEOGRAPHICAL RESEARCH, 2008, 27(4): 745-755.

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基于SPOTNDVI的华北北部地表植被覆盖变化趋势

Indicating variation of surface vegetation cover using SPOT NDVI in the northern part of North China

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