Evaluation models of meteorological conditions for vegetation growth on natural grasslands in China
中国天然草地植被生长气象条件评价模型

By using fuzzy mathematics,the functions of sunlight,temperature and precipitation about the vegetation growth on natural grasslands in China were established.Through "and" collection,a comprehensive evaluation model of the meteorological factors was built,and their accumulated effects on the grassland vegetation in any period of time could be known by using integral methods.After comparing the meteorological indices among years,the meteorological conditions for our natural grassland vegetation growth were evaluated.The established models were applied to calculate the meteorological indices by month,season,and main growth periods in 2005 and 2006,and to evaluate the meteorological conditions in these two years for the grassland vegetation growth.The differences of meteorological indices in different time scales reflected the good or bad of the meteorological conditions in 2005 and 2006 for our natural grassland vegetation growth,which was in accordance with the measured differences of grass yield and height.