河南省陆地植被净第一性生产力估算及其时空分布

基于地理信息系统和卫星遥感技术，利用地面气象数据和MODIS数据，同时考虑河南省自身实际地理和植被覆盖情况，在对最大光利用率和水分胁迫系数的获取进行改进的基础上，利用CASA模型对河南省植被净第一性生产力（NPP）进行了估算，并分析了其时空分布。结果表明，2008年河南省NPP生产量为34.87 Mt C，NPP空间分布和植被类型有密切关系，森林植被最大，然后依次是灌丛、草地、农田等。12、1和2月NPP最小，植物基本停止生长，植被的NPP只占全年的1.38％；5、7和8月的NPP最大，占全年总量的56.84％。与Miami、Montreal、Chinkugo模型相比，本研究结果和Miami模型结果最为接近，植被类型NPP均值排序和Chinkugo模型相似；与实测数据对比结果显示，模拟值接近于实测值，说明模型适用于河南省NPP的模拟。

Estimation of terrestrial net primary production and its temporal-spatial distribution in Henan Province based on GIS and RS

On the basis on data from the ground meteorological station and remote sensing,and differences in maximum light utilization efficiency,the CASA mode was used to estimate the net primary production(NPP) by the ARCGIS 9.2 and ENVI 4.5 in Henan Province,China.The results of this study showed that NPP in Henan Province was 34.87 Mt C,and its spatial distribution was closely related to vegetation type,indicating that NPP of forest was the biggest,NPP of shrub came to the second,and NPP of grassland and cropland was the third and the fourth.NPP in December,January,and February was the lowest,accounting for 1.38% of annual NPP,and those in May,July,and August were was the biggest,which was 56.84% of annual NPP.Compared to Miami,Montreal,Chinkugo model,this study was similar to results from Miami,and order of vegetation types was similar to order from Chinkugo.This study suggested that the CASA mode predicted well the NPP in Henan Province,and was suitable for simulating the NPP.