THE INFLUENCES OF WINTER-SPRING'S AIR TEMPERATURE CHANGE ON GRASSLAND PRODUCTIVITY IN HAIBEI AT QILIAN MOUNTAIN
LI Ying-nian;ZHANG Jing-hua
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1 Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining, Qinghai 810001;2 Meteorological Observatory of Qinghai Province, Xining, Qinghai 810001
Grass production of Alpine Meadow is highly negatively correlated with winter-spring air temperature of Haibei at Qilian mountain. The rising of winter-spring air temperature leads to the decrease of grassland production, and this is maily because that the rising of winter-spring air temperature makes winter frozen layer thinning and soil water lossing seriously. At the beginning of nutritional growing period,faced with the most severe "drought" pressure and deficient natural precipitation in North China, the requisite water for grass growing and developing are limited, and the rise of grassland production is ultimately limited. analysing the winter-spring air temperature by EOF, a regression model is set for the effects of air temperature on grass production. The regression results show that the fitting rate is relatively high, the results of prediction for 1995 show the model's erros is small,and the effect is very good.
李英年;张景华.
THE INFLUENCES OF WINTER-SPRING'S AIR TEMPERATURE CHANGE ON GRASSLAND PRODUCTIVITY IN HAIBEI AT QILIAN MOUNTAIN. Plateau Meteorology. 1998, 17(4): 443-446