中文摘要：

基于2003～2012年的遥感数据及DEM高程模型校准后的气候数据,利用CASA模型估算了祁连山地区植被净初级生产力（NPP）,并对NPP的年内、年际变化以及时空分布规律和变化趋势进行分析.结果表明：（1）祁连山地区年内NPP集中在6～8月,占全年NPP总量的86.39％;2003～2007年,NPP年均值在165.28～192.75g·m 2·a -1之间小幅波动;2007～2009年呈现出较明显的下降趋势,由168.63 g·m 2·a -1下降到153.17 g·m 2·a -1;2009～2012年表现出明显的上升趋势,最大值达207.13 g·m 2·a -1.（2）祁连山地区的NPP东西部分布差异大,东部地区大多在200～400 g·m 2·a -1之间,部分地区可达500 g·m 2·a -1之上;中部地区存在较明显的南北差异,南部大多地区在100～300 g·m 2·a -1之间,北部大多地区在100～400 g·m 2·a -1之间;西部广大地区大多在0～100 g·m 2·a -1之间,荒漠和高山冰雪覆盖区域生物量最低.（3）近十年来,祁连山地区的NPP呈波动增加趋势,增加面积约9 867 km2,约占植被总面积的21.19％,减少面积约8 173 km2,约占植被总面积的17.52％,表明祁连山的生态健康水平总体在改善但局部在恶化.

英文摘要：

By using the remote sensing data and the climate data of DEM elevation model calibrated in 2003 --2012,we estimated the net primary productivity（NPP） of Qilian Mountains vegetation based on CASA model. The years, annual variation of NPP, the temporal-spatial distribution and change trend were also analyzed. The results reveal that.（1）The NPP in Qilian Mountains is mainly concentrated during the summer （June to August） ,it accounts for 86.39% of the total NPP;From 2003 to 2007,Minor fluctuations between 165.28 g · m-2 · a-land 192.75 g · m-1 · a-1 in the annual average of NPP;NPP showed a significant downward trend from 2007 to 2009,by 168. 63 g · m-2 · a-1 down to 153. 17 g · m-2 · a-1 while,NPP showed a clear upward trend from 2009 to 2012,the maximum value can reach 207.13 g · m-2 · a- 1 （2） The spatial distribution of NPP in Qilian Mountains showed a rising tendency from west to east. NPP in most of the eastern reions varied from 200 to 400 · m-1 · a-1 ,in some areas to 500 · m-1 · a-1.There were obviously differences between the north and the south in the central region;NPP in most of the southern regions varied from 100 to 300 g · m-2 · a-1 ,but it varied from 100 to 400 g · m-2 · a-lin most northern regions. NPP in most of the western regions was between 0 and 100 g · m-2 · a-1 ,especially the desert and alpine ice snow covered area had the lowest biomass. （3）NPP in the Qilian Mountains has been increased volatility in the recent ten years;the area of NPP increased about 9 867 km2 and it accounts for about 21.19· of the total area;the reduced account for 17.52% of the total area about 8 173 km2. The re sults showed that the ecological health of Qilian Mountains is improving in the overall, although it deteriorated in the local.