近25年山西植被指数时空变化特征分析

Analyses on spatial-temporal change characteristics of NDVI during the past 25 years in Shanxi

在遥感及地理信息系统技术支持下,利用1982—2006年8km×8km的NASA/GIMMS植被指数(NDVI)数据,采用多种方法分析了山西高原近25a来植被指数的时空动态变化规律。结果表明:①25a来,山西省年均NDVI基本在0.33上下呈波动中上升趋势,表明山西高原植被活动在增强;②从季节变化来看,山西省春季和秋季的植被都在增加,冬季上升趋势较弱,夏季变化很小,呈现极弱的递减趋势;③空间上,植被指数南部好于北部,山区好于平原;④从植被变化趋势图中也可以看出植被呈现总体变好趋势,其中北部变好趋势明显,其次是南部;⑤植被年际变化表现出较为一致的变化趋势以及较为明显中部和南北反相的局地变化特征。

The vegetation spatial-temporal change characters were analyzed in Shanxi, using the NASA/GIMMS（Global Inventory Modeling and Mapping Studies） NDVI data set, which was collected at a spatial resolution of 8 km and 15 clays interval, for the period from 1982 to 2006.The result showed that： in the past 25 years, the annual average NDVI were around 0.33, and it follows a fluctuating ascending trend. The NDVI variation trends of spring and autumn were increased, the trends of winter were increased infirmness, the trends of summer were decreased infirmness. The NDVI in south was better than in north, and mountainous were better than plain. The characteristic of NDVI in the whole area was increasing, the change trends of north were obviously than of south. The annual change of NDVI displayed the same change tendency as well as obvious opposition local characteristic between middle and the north and south.