【摘要】 利用祁连山北坡2004年5类草地生物量的调查数据和同期的气象资料,估算了草地生物量的大小,并探讨了草地生物量与气象因子的关系。结果表明,总体上,祁连山北坡草地生物量为490.4 g/m2,其中地上、地下生物量分别为42.14、48.3 g/m2,地下生物量约为地上生物量的10倍;植被盖度与生物量、0~20 cm土层土壤含水量均呈显著的正指数关系(P<0.05),说明生物量和表层土壤含水量随盖度的增加而增大;生物量与降水量、相对湿度呈正相关,与大气温度、土壤温度和干燥度呈负相关,但均没达到显著水平(P>0.05),而与土壤含水量呈显著正相关(P<0.05),表明土壤含水量是影响祁连山北坡草地生物量的重要因素。更多还原

【Abstract】 Based on grassland biomass field investigation and synchronous meteorological data in 2004;we estimated grassland biomass and evaluated the relationships between grassland biomass and meteorological factors in the northern slopes of the Mountains Qilian.The results indicated that the total grassland biomass was estimated to be 490.4 g/m2.The average above ground and below ground biomass were estimated as 42.1 and 448.3 g/m2 respectively.The vegetation coverage had a prominently positive exponent correlation with biomass and soil moisture content of 0~20 cm(P<0.05).It implied that biomass and soil moisture content of 0~20 cm significantly increased with the increase of vegetation coverage.Biomass was positively correlated with precipitation and relative humidity and negatively correlated with air temperature,soil temperature and aridity index.However,the relationships among all of them did not reach the level of significance(P>0.05).The biomass was significantly positively correlated with soil moisture content(P<0.05).Soil moisture content is the key factor influencing biomass in the northern slopes of the Mountains Qilian.更多还原