Climate Change On The Impact Of Hulunber Grassland Pasture Growth

The Hulunbeier grassland is middle temperate zone, continental monsoon climate. In recent years,90% of natural grass have shown various degrees of degeneration against exceptional weather word-wide and exceeding fast increase of population in pasturing areas. The climatic change is one important factor of inducing grassland deterioration, and it is vitally important to analyze the effect that distributional characteristics and variable rule in time-space of meteorological elements on growing development of pasture.In this paper, according as variation character of meteorological elements (temperature , precipitation etc) of Hulunbeier grassland, making use of the weather records (1951-2004 years) and monitoring data of pasture, analyzed the constitutional character and variable rule of temperature and precipitation of this area, and quantificational searched the relation between meteorological factor and growing development of pasture by the means of correlation system and integral regression. The results indicated:When the temperature heads up , the grass turns green ahead of the time before the premise of the climate warming .The information indicated that the grass turned green ahead of 10-12 days average in recent 10 years. In the term of the grass growth, when the temperature rise, the grass growled quickly, the high of the grass increased, the growth day of the grass shorted and the after-grass growth extended.Through statistic of the precipitation change rate, spring precipitation changed decisively and summer precipitation changed weakly within a year. The results indicated that the frequency of drought occurred in spring, which is disadvantaged to the grass growth. Under the conditions of Etesian wind, the precipitation gathered in mild season, which is favorite to the grass growth. But the precipitation of season dived in homogeneity , the grass growled slowly and the grass didn't mature before autumn frost.The grass growth in nature grassland is effect seriously by environment .The development and dry matter accumulated of herbage have big different between yearsand growing seasons. Utility the monitor data of grass to analysis the effluences of climate to the grass development and to build the model of grass development and dry matter accumulation.