香格里拉县植被净初级生产力遥感估算

Estimation of net primary productivity based on remote sensing and geographic information system in Shangrila county

采用2009年MODIS数据作为遥感信息源,结合香格里拉基础地理数据和云南省119个气象站点的气象数据,构建了一个NPP估算模型。利用遥感技术和地理信息系统技术,在ArcEngine二次开发技术的支持下,实现了香格里拉县2009年植被净初级生产力的估算研究。结果表明：（1）设计的NPP估算模型简单,参数少,易于理解和计算;（2）比较发现：2009年香格里拉县NPP估算结果可信。（3）分析香格里拉县2009年NPP的变化情况可得到以下结论：（a）香格里拉县2009年植被净初级生产力为413 g/m2,总体分布趋势是：建塘镇北部和格咱乡西部NPP基本在400～600 g/m2之间;香格里拉县中部、东南部、东北部、北部基本上在200～400 g/m2之间;东旺乡的上游村、跃进村、中心村、胜利村的NPP在0～200 g/m2之间。（b）从3月至10月的时间段里,香格里拉植被NPP可占全年的净初级生产力的82%,因此,可判定香格里拉县植被生长季为3月～10月。

By taking MODIS remote sensing data measured in 2009 as the sources of information, combined with the basic geographic data of Shangrila and the meteorological data collected from 119 meteorological stations in Yunnan province, the model for estimating Shangrila County＇s plant net primary productivity（NPP） in 2009 was built. With the remote sensing and GIS technology, by support of the ArcEngine secondary development technology, the estimation of vegetation net primary productivity of Shangrila County in 2009 was carried out. The results show that（1） The designed NPP estimation model is simple, fewer parameters, easy to understand and calculate;（2） Comparison with other NPP study in the same area, the result of Shangrila County NPP estimation in 2009 is credible;（3） Shangrila County NPP of carbon in 2009 was 413 g/m2, but the carbon distributions in different villages and towns were uneven, the NPP values in the north of Jiantang town and the west of Geza town were between 400 ～ 600 g/m2; that in the central and southeast and northeast and north of Shangrila were 200 ～ 400 g/m2, 0 ～ 200 g/m2 in northern part of Dongwang town; From March to October, the vegetation NPP in Shangrila county accounted for 82% of annual net primary productivity in the current year; Therefore, March to October can be determined as the Shangrila county＇s vegetation growing season.