中文摘要：

本研究利用Terra/MODIS植被指数产品MOD13A3以及2005-2006年青海省草地调查资料,建立了草地地上生物量和植被盖度遥感反演模型,模拟分析了青海省鼠害发生区域、危害区域和正常区域草地资源在2001-2010年期间的各月及年际生物量及植被盖度变化动态。结果表明,1）EVI指数函数模型为模拟生物量鲜重最优模型,而对数函数模型为植被盖度模拟最优模型,拟合精度分别为70.18%和77.43%;2）研究区不同草地类型鼠害发生区域、危害区域的地上生物量和植被盖度随着鼠害危害状况的加重而呈下降趋势,在盛草季表现最明显,这种趋势近10年基本保持不变。

英文摘要：

Combining Terra/MODIS vegetation index products MOD13A3 and field surveying data from 2005-2006, remote sensing inversion models of grassland aboveground biomass （GAB） and vegetation coverage （VC） in Qinghai Province were established. They were used to separately simulate and analyze the monthly and annual dynamic changes of biomass and vegetation coverage during 2001-2010 in rodent infested regions, harmful regions and rodent-free regions in the study area. Rodents had a significant influence on grassland pro- ductivity in the study area. 1） An exponential model of MODIS-EVI （enhanced vegetation index） and a loga- rithmic model were the optimal models to estimate the green yield of GAB and VC, respectively and had a precision of 70.18% and 77.43%, respectively. 2） The area decreased with the aggravation of rodent pests, ency remained stable during the whole study period. GAB and VC for different types of grasslands in the study especially in July and August of each year, and this tendency remained stable during the whole study period.