广东省植被NPP时空特征变化分析

Analysis of Temporal-spatial Characteristics of Vegetation NPP in Guangdong Province

利用EOS/MODIS卫星遥感资料,对2000-2005年广东省农田、林地和草地3种植被类型的植被净初级生产力(NPP)的时空变化特征进行了分析。结果表明,广东省农田、林地和草地的年均NPP分别集中在480～590gC/(m2·a),590～760gC/(m2·a),540～690gC/(m2·a)之间,林地最高,草地次之,农田最低。NPP变化趋势检测显示,广东省大部分地区这3类植被NPP均呈增长趋势,生长态势良好,NPP呈显著增长的面积占这3类植被总面积的61.29%。珠三角城市群和汕头等经济工业发达地区的局部NPP表现出显著减少的趋势,表明这些地区城市扩张和新增工业用地等人类活动在较大程度上破坏了当地植被,或影响了其正常生长,导致NPP的降低。

Using EOS/Modis satellite remote sensing data, this article analyses the temporal and spatial characters of vegetation NPP of farmland, woodland and lawn in Guangdong, between 2000 and 2005. The result shows that the average NPP of woodland is superior, with the NPP of 590-760 gC/（m^2· a）, and that of lawn （540 -690 gC/（m^2· a）） is second, and that of farmland （480 -590 gC/（ m^2·a） ） is lowest. The trend of NPP displays that NPP of the three kinds of vegetation is increasing in most area of Guangdong, and the areas increasing clearly take up 61.29%. However, in the well - develop areas, such as Pearl River Delta cities and Shantou, the NPP reveals the decreasing trend of vegetation, it shows that human activities, such as cities expansion and industry - use land, affect the growth of vegetation, leading to NPP falling.