利用CASA模型估算我国植被净第一性生产力

APPLICATION OF CASA MODEL TO THE ESTIMATION OF CHINESE TERRESTRIAL NET PRIMARY PRODUCTIVITY

基于地理信息系统和卫星遥感应用技术 ,利用 CASA模型估算了我国 1997年植被净第一性生产力及其分布。结果表明 :1997年我国植被净第一性生产量为 1.95 Pg C,约是世界陆地植被年净第一性生产力的 4.0 % ;我国植被净第一性生产力的主要分布趋势是从东南沿海向西北逐渐减小 ;其中海南岛南部、云南西南部、青藏高原东南部的热带雨林和季雨林地区植被年净第一性生产力最大 ,达 90 0 g C· m- 2· a- 1以上 ,而西部塔克拉玛干沙漠地区植被年净第一性生产力最小 ,不足 10 g C· m- 2· a- 1。

The net primary production (NPP) of Chinese terrestrial vegetation in 1997 was estimated based on the CASA model. The geographic distribution of NPP was explored using GIS and remote sensing imagery (NOAA/AVHRR),together with spatial data on vegetation, climate, soil type and solar radiation. The model estimates China's terrestrial NPP in 1997 as 195 PgC, or about 40% of the worlds terrestrial total. NPP decreased from southeast China toward the northwest. Southern Hainan Island, Southwestern Yunnan and Southeastern Tibet showed large NPP values, with the value exceding 900 gC·m -2·a -1, whereas the Takelamagan desert located in western China had very small values-less than 10 gC·m -2·a -1.