Abstract

The detail variations of precipitation, potential evapotranspiration (PET) impacts the terrestrial ecosystem.The grassland water deficit or surplus status (GWDS) from 1961 to 2010 were systemically studied for the Qinghai-Tibetan Plateau (QTP) using daily data of all meteorological stations. The results indicated that the temporal variations of precipitation were not corresponding to those of PET in a year. The maximum monthly precipitation occurred in July, while the maximum monthly PET appeared in June, the spring precipitation was ranked the second, but its PET was ranked the first in a year. The total water deficit (PET-precipitation) from March to June was more, 51.4 % of the total annual value. Therefore, the drought more frequently occurred in Spring and June in the QTP. The grassland can be protected in a year, especially in Spring and June.

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