基于CASA模型的三江源地区植被净初级生产力遥感估算研究

Estimation of net primary production in the Three-River headwater region using CASA model

以改进后的CASA模型为基础,利用MODIS数据、气象数据和植被类型数据,估算了2010年三江源地区植被净初级生产力(NPP)。结果表明:三江源地区NPP的总值为52.146×1012gC·a-1,平均值为146.66g C·m-2·a-1,呈现由东南向西北逐渐递减的空间分布趋势,并随着海拔和坡度的增高,NPP先升高后降低。

Based on the remote sensing technology, MODIS data, meteorological data and other related data , the net primary production of the terrestrial vegetation in the Three - River headwater region, and its spatiotemporal distribution in 2010 were estimated based on the CASA（ Carnegie -Ames- Stanford Approach） model. The results indicated that the main spatial pattern of NPP was that the total terrestrial NPP was 52. 146 × 10^12gC, the average NPP was 146.66 g C · m-2 · a-1, and NPP gradually decreased from southeast to northwest in the study area . With the increase of the altitude and slope, NPP firstly increased and then decreased.