人口与经济发展对植被的影响研究

植被是陆地表面主要的覆盖物，也是许多地球系统过程的重要变量。人类活动对植被的影响在区域尺度上是显著的。以重庆市为例，使用滑动平均和SG滤波对SPOT/VGT NDVI时间序列数据进行了平滑处理，结合GDP和人口栅格化数据，从时间序列和空间相关场两个方面分析了植被与人类活动因子之间的时空相关性。结果表明，从1998到2005年，植被的分布和生长状况并没有随GDP和人口的持续增加而增加。在时间序列上，植被覆盖与GDP和人口之间总体上呈显著的负相关关系；在空间上，这种相关关系表现出了较强的异质性。空间相关场表明：较强的负相关主要发生在相对发达的主城区周围，反映了快速的经济发展和城市化使得植被面积和生产力降低；然而在偏远的山区，由于经济落后同时植被覆盖较少，出现了正相关。

INFLUENCE OF POPULATION AND ECONOMIC DEVELOPMENT ON VEGETATION

Vegetation is an important variable in earth system.Influence of human activities on vegetation is obvious on certain scales.This paper，taking Chongqing City as an example，analyzed the correlation between artificial factors and vegetation spatio temporal distribution based on time series NDVI data.It is shown that vegetation distribution and growth does not increase steadily nor rapidly like GDP and population with sustainable increasing trends from 1998 to 2005.There is always negative correlation between vegetation and GDP and population in terms of time series.However，the correlation appears significantly heterogeneous in space.The obvious negative correlation is observed in relatively developed areas nearby the center of the city where rapid economic development and urbanization make vegetation decrease both in distribution and productivity；whereas positive correlation is observed in those areas away from the city especially in underdeveloped areas.