Indicating variation of surface vegetation cover using SPOT NDVI in the northern part of North China
Received date: 2007-12-10
Revised date: 2008-04-16
Online 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
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
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 . DOI: 10.11821/yj2008040003
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