【摘要】 本研究以高山草原鼠兔(Ochotona curzoniae)为研究对象,对5个不同鼠洞密度梯度的草地生境、植物群落组成、土壤养分以及地上生物量研究分析。结果表明:1)草地生境土壤温度、容重与鼠兔洞口数量呈显著负相关关系(P <0.05),而植物群落中高山豆(Tibetia himalaica)数量的变化与鼠兔洞口数量变化相一致;2)随着鼠兔洞口数量的增多,土壤养分(土壤全碳、全氮、全磷、有机碳、速效氮和速效磷)含量增加,但未通过显著性水平检验(P>0.05),地上生物量显著增多(P <0.05),但是地上植物多样性却显著降低(P <0.05)。研究结果揭示了高原鼠兔更偏好于保暖性好和干燥的土壤,以及棘豆类植物主要分布的草地;此外,高原鼠兔洞口数量的增加,在一定范围内,能够改善高寒草原的土壤营养环境,促进地上生物量的增长。更多还原

【Abstract】 We investigated the relationship between plateau pika(Ochotona curzoniae) burrow entrance densities and soil physical properties, soil chemical properties, species composition and aboveground biomass(AGB) in an alpine grassland in Xianza County. The results indicated that: 1) soil physical properties(soil temperature and soil bulk density) declined as the number of pika burrow entrances increased(P < 0.05), while the number of pika burrow entrances increased as the density of Tibetia himalaica increased; and 2) as burrow entrance density increased, the concentration of soil nutrients(soil total carbon, total nitrogen, total phosphorus, organic carbon, available nitrogen and available phosphorus) increased(although the correlation was not significant at P > 0.05), the diversity of plants decreased(P < 0.05), and the aboveground biomass increased(P < 0.05). Plateau pika preferred warm and dry soils, and grassland where Oxytropis glacialis was present. The increase in the number of plateau pika, up to a certain point, improves the soil nutrient status and increases the aboveground biomass of alpine grasslands.更多还原