江苏省植被净初级生产力时空分布格局研究

Analysis of spatio-temporal distribution characteristics of vegetation NPP in Jiangsu province

基于MODIS植被净初级生产力(NPP)数据产品,利用ArcGIS地理信息系统软件和ENVI遥感软件空间分析工具,分析了2000—2006年间江苏省NPP的时空分布.研究结果表明:江苏省NPP值空间分布由东南部向西北部递减,在时间变化上,研究时段内2004年NPP值相对较高,2003年相对较低;通过对各个地级市及距海岸不同距离的NPP值分析,发现随着距离海岸线的距离不断加大,NPP值先增加后降低.最后对江苏省NPP时空分布影响因素做了简要分析.

Net Primary Productivity （NPP） is the accumulation of organic matter by green plants per unit of space and time. Using Geographic Information System and Remote Sensing spatial analysis software, this paper analyzes the spatio-temporal distribution characteristics of vegetation NPP in Jiangsu province from 2000 to 2006 based on NPP data from EOS/MODIS. Results show a decreasing spatial trend from southeast to northwest and a temporal trend with higher NPP in 2004. The average annual NPP in Jiangsu province （ 569.28 gC/（ m^2 · a） ） was higher than the national average NPP during the same period （345.91gC/（ m^2·a）） and a little lower than the average NPP in Guangdoug（595.51 gC/（ m^2·a） ）. Analyzing NPP of different city and different buffer of shoreline shows that the NPP increases firstly and then decreases with the increasing distance to shoreline. NPP of Nantong （ a city in the Southeast of Jiangsu） was highest （693.57 gC/（m2 ＂a））,while NPP of Xuzhou （a city in the Northwest of Jiangsu） was lowest （478.72 gC/（ m^2. a） ）. NPP grows to the highest when the distance to the Ring Buffer increases to 30 km, and land cover change is an influential factor affecting changes in vegetation NPP based on Ring Buffer. Analysis of vegetation NPP shows that climate factors were the key factors controlling the NPP in Jiangsu, and the human influence is becoming more and more important.