Drought Monitoring and Evaluating for Qinghai-Tibet Plateau Grassland

摘要

The grassland is the main part of the Qinghai-Tibet Plateau which consists of 30% of grassland in China. The method of grassland drought monitoring and evaluating was studied on base of Penman-Monteith equation (Allen et al. 1998) and AVIM-GPvASS model (Qian et al. 2012 ) using daily meteorological data in Qinghai-Tibet Plateau from 1961 to 2007. Temperature, precipitation, sunshine hours, evapotranspiration, water surplus and deficit of a year and four seasons, in the growing season from April to September were systemically calculated and analysed. The grassland drought index was developed according to climate suitability of grassland vegetation, water surplus and deficit, net primary productivity (NPP). The grassland drought index and indicators of drought monitoring and evaluating were validated using data in 2006 and 2007, applied in 2012 for Qinghai-Tibet Plateau grassland. Results showed the index and indicators reflected the water surplus and deficit, drought conditions and its influence ongrassland productivity.