中文摘要：

净第一性生产力是表现陆地生态过程的关键参数，土地利用变化深刻影响区域的净第一性生产力。选取关中一天水经济区为研究区域，尝试对30m精度的1980-2011年4期9月份左右Landsat7的遥感影像以及CASA模型来估算关中一天水经济区的净第一性生产力，并用2011年遥感图像解译获得该年的土地利用数据，以及土地利用变化情况。在此基础上分析土地利用变化对净第一性生产力的影响，并且对关天经济区各县市净初级生产力进行了对比和分析。结果表明：1980-2011年，关中一天水经济区土地利用耕地、林地、居民建筑用地变化明显，南部秦岭山区多为林地-9草地，净第一性生产力高达625．37gC·m^-2·a^-1，而关中平原-9天水地区人口居住区与开垦区净第一性生产力明显下降，最低达47．78gC·m^-2·a^-1，人为的开发与利用土地降低了区域的净第一性生产力。所以，要继续施行落实退耕还林政策，控制城镇用地较大速度的扩增，以保持好区域的生态服务功能。

英文摘要：

Net primary productivity is the key parameter of terrestrial ecological processes, and an important indi cator of estimating the Earth＇s support and sustainable development evaluation of land ecological system. Net prima ry productivity is influenced by LUCC. Changing land uses and cover types influences the vegetation composition and health, so it is an important tool for monitoring ecosystem responses to environmental change with understanding the effects of these changes on net primary production （ NPP ）. Guanzhong-Tianshui economic region is one of key construction of economic zone which is proposed in the ＂Eleven-Five＂ Plan of development of the western part of the country. Using remote-sensing images and precipitation, temperature, and total solar radiation data from 1980,2000, 2005 and 2011, and a light utilization efficiency model, we studied the effects of changes in these parameters and land use and cover types on NPP in China＇ Guanzhong-Tianshui region. We determined the NDVI of vegetation in the basin, and used these results to estimate the NPP of vegetation in the basin and the influence of land use and cov- er type changes on NPP under two climate scenarios. Using CASA model to estimate the NPP and get LUCC in Guanzhong-Tianshui Economic region for four years. Based on the analysis, get the effect of land use change which impact on net primary productivity. At last, give a solution for Guanzhong-Tianshui Economic region make the area developing sustainable. Results indicate as follows： （ 1 ） the net primary productivity is 2.3 × 10^7 gC.m^-2.a^-1 in 1980, 1.7 x 107 gC.m^-2.a^-1 in 2000; 2.4 x 107 gC.m^-2.a^-1 in 2005 ; 2.1 x 107 gC.m^-2.a^-1 in 2011. returning farmland to re- gional net primary productivity growth has significant effects, form 2000 to 2005 years, the net primary productivity of forest increased 3.15 x 107 gC.m^-2.a^-1, accounting for 41.2%. （2） It is obvious that the relationship with spatial distribution of the net primary productivity and land use types, e