江苏省植被覆盖动态变化及影响因素分析

Dynamics of Vegetation Cover and Influencing Factors of Jiangsu Province

以江苏省为研究区,对该区域1998-2008年以及2000-2010年SPOT遥感影像和13个气象站点观测的气候数据(温度、降水)进行分析,探究NDVI的变化及其与主要气候因子的关系,采用MVC最大值合成法、趋势分析以及相关分析等方法对相应数据分别进行时间、空间尺度的分析。结果表明:(1)近十多年来,江苏省NDVI总体呈缓慢波动上升趋势,变化幅度在±0.04;(2)江苏省大部分地区夏季ND-VI值达到最大,冬季降到最小,全年表现出较强的季节变化特征;(3)苏北地区多年平均NDVI值明显偏高,而苏南地区NDVI值则显著偏低,并且苏北地区NDVI的变化幅度较苏南地区的小;(4)江苏省NDVI值与气温呈正相关性,在春、夏和秋季表现明显,而NDVI与降水具有弱正相关性,仅在秋季显著相关,降水量不超过阈值,对NDVI产生驱动作用。

Remote sensing images of costal area of Jiangsu province between1998(2000)and2008(2010)from SPOT and climatic data from thirteen meteorological stations were used to explore the relationshipbetween change of NDVI and climate,making temporal and spatial analysis with the method of MVC,tendency linear analysis,correlation analysis.The result shows:1)In the last ten years,NDVI has a slowascent within the scope of±0.040.2)Most vegetation cover shows strong seasonality:average NDVIreaches its maximum value in summer and minimum one in winter.3)NDVI is on the increase in NorthJiangsu,while on the decrease in the south.NDVI of North Jiangsu is higher than that of South Jiangsu,while variation is the reverse.4)A significant positive correlation is observed between NDVI andtemperature,especially remarkable in spring,summer and the fall.The correlation between NDVI andprecipitation is relatively weaker.It is only significant in the fall:on the condition that precipitation is nomore than the threshold value,it can exert an influence on NDVI.