【摘要】 利用祁连山北坡5类天然草地地上/地下生物量和同期的气象资料,分析5类草地的根冠比(R/S)与气候因子的关系。结果表明:5类草地生物量为山地草甸>山地草原>山地草甸草原>高寒草原>山地荒漠草原,除高寒草原、山地草甸草原和山地草原的生物量之间无显著差异外,其余各类之间差异显著(P<0.05);高寒草原、山地草甸、山地草甸草原、山地草原和山地荒漠草原的R/S分别为9.3,8.7,5.1,7.0和7.1;5类草地R/S的季节变化均呈反抛物线型,但变化不尽相同;高寒草原的月R/S随上月土壤含水量的增加而显著降低,山地草甸草原和山地草原的月R/S随上月潜在蒸散量的增加也呈显著降低趋势,而山地草甸和山地荒漠草原的月R/S与前期的水热因子无显著相关关系。更多还原

【Abstract】 In this paper,the relationships between the root-shoot ratios and meteorological factors were analyzed using the data of aboveground and underground biomasses of five types of natural grasslands and the synchronous meteorological data in northern slope of the Qilian Mountains.The results indicated that the biomass of five types of natural grasslands was in an order of mountain meadow > mountain steppe > mountain meadow steppe > alpine steppe > mountain-desert grasslands;difference of the biomass among the five types of natural grasslands was significantly except that among alpine steppe,mountain meadow steppe and mountain steppe(P<0.05);root-shoot ratios of alpine steppe,mountain meadow,mountain meadow steppe,mountain steppe and mountain-desert grasslands were 9.3,8.7,5.1,7.0 and 7.1 respectively;there was a reverse-parabola-shaped seasonal variation in curves of root-shoot ratios of the five types of natural grasslands,but the seasonal variation of their root-shoot ratios was different;root-shoot ratio of alpine steppe was significantly decreased with the increase of soil moisture content in previous month,the root-shoot ratios of mountain meadow steppe and mountain steppe were significantly decreased with the increase of potential evapotranspiration in previous month,but there was no significant correlation between the root-shoot ratios of mountain meadow and mountain-desert grasslands and the hydrological and sunshine factors in previous month.更多还原