植被净第一性生产力 (NPP)研究方法很多 ,运用NOAAAVHRR的可见光、近红外和热红外波段来提取和反演地面参数 ,进而准确估算陆地植被净第一性生产力 ,是一种全新的研究手段。利用遥感数据进行生物量和净第一性生产力的估算 ,主要是采用光能利用率模型 ,即通过NPP与植物吸收的光合有效辐射 (A PAR)和植被将所吸收的光合有效辐射转化为有机物的转化率 (ε)的关系来实现的。用数学公式可表达为 :NPP =(FPAR×PAR)× [ε ×σT×σE×σS× (1-Ym)× (1-Yg) ]在遥感和地理信息系统技术的支持下 ,以 1990年每旬的 8km分辨率的NOAAAVHRR 1— 5通道的影像为数据源 ,对中国每旬的陆地植被净第一性生产力进行估算 ,然后累加得出全年的NPP值。估算结果 :1990年我国陆地植被NPP总量为6.13×10 9t/a ,NPP最高值为 1812 9gC/m2 。就计算结果 ,对中国大陆植被NPP的分布规律进行了分析。遥感模型能够以面代点 ,比较真实地反映陆地植被NPP的时空分布状况 ,与我国植被分布的地理规律性相符 ,这是其它统计模型所无法比拟的

By means of Remote Sensing,the estimation of biomass and NPP mainly is on the basis of the models of solar energy efficiency,The biomass and NPP can be calculated through the relation among NPP,APAR and the rate(ε)of which transform APAR to the organic matter.The model is::NPP =(FPAR×PAR)× [ε ×σT×σE×σS× (1-Ym)× (1-Yg) ] On the basisof RS and GIS,the net primary production of terrestrial vegetation of China in every ten days using the NOAA AVHRR data with five channels and 8km*8km resolution cell was calculated.And then the annual NPP was accumulated.The result shows the total NPP of terrestrial vegetation of China is 6.13×10 9t/a in 1990 and the maximum NPP is 1812 9gC/m2. According to this result,the spatial distribution of NPP show a decreasing trend from soucheas China to north-west China.The distribution may have close relationship with the distribution of vegetation. The NPP varies with the different vegetation.It is indicated theat the NPP of conifer,broadleaf,shrubbry,grassland,meadow/morass,desert,and corn are 1031.92gC/m2,1023.60gC/m2,822.99gC/m2,502.10gC/m2,690.86gC/m2,132.21gC/m2 and 891.18gC/m2respectively.According to the yearly NPP,the NPP of shrubbery is 1621.07*10 6tCaˉｔ accounting for the largest part of China (16.4%)。The sequences of the other vegetation types are forest and com,grassland,meadow and desert.The yearky NPP of them are 1490.28*10 6tCaˉ1（24.3%）,1485.54*10 6tCaˉ1（24.2%），722.83*10 6tCaˉ1（11.8%），566.13*10 6tCaˉ1（9.2%）and 216.13*10 6tCaˉ1（3.52%）respectively.The NPP of differernt land use typed shows that the NPP of forest,agriculture land,grassland,water area,inhabitant aera,wasteland and hard-using land are 966.08gC/m2,897.15gC/m2,545.92gC/m2，656.28gC/m2,550.46gC/m2,299.74gC/m2 and 106.56gC/m2.According to the yearly NPP,the NPP of forest is 2096.87*10 6tCaˉ1 accounting for the largest part of China (34.2%).The sequences of the other vegetation types are grassland,agriculture land,wasteland,hard-using land,water area and inhabitant area,The yearly NPP of them are 1911.41*10 6tCaˉ1（31.2%),1760.57*10 6tCaˉ1（28.7%）,193.96*10 6tCaˉ1,125.92*10 6tCaˉ1,51.62*10 6tCaˉ1 and 3.84*10 6tCaˉ1 respectively.