【摘要】 高寒草原是青藏高原广泛分布的植被类型。本文以贡嘎南山-拉轨岗日山南坡高寒草原生态系统为对象,采用野外调查与室内分析相结合的试验方法,对高寒草原生态系统植被碳密度的分布特征及其影响因素进行了研究。结果表明:贡嘎南山-拉轨岗日山南坡高寒草原生态系统植被碳密度平均为0.8435±0.6048 kg/m2,变异系数71.69%。在海拔44244~804 m范围内,随着海拔升高,植被碳密度表现出先增加后减少的分布特征。影响植被碳密度的关键环境因子是:植被高度、0—10 cm地下生物量、10—20 cm地下生物量、0—40 cm土壤含水量、0—20 cm土壤容重2、0—40 cm土壤容重、土壤有机质、土壤速效钾含量和土壤速效氮含量。更多还原

【Abstract】 Alpine grasslands are one of the most widely distributed vegetation types on the Qinghai-Tibet Plateau.In this paper,alpine grassland ecosystem of Gongga South Mountain-Lhagoi Kangri mountain southern slopes as targeted field, alpine grassland ecosystem carbon density distribution of vegetation characteristics and influencing factors were studied with a combinative test methods of field investigation and laboratory analysis.The results showed that the average vegetation carbon density was 0.8435 ± 0.6048 kg/m2 and coefficient variation was 71.69% in Gongga South Mountain-Lhagoi Kangri mountains southern slopes of alpine grassland ecosystems.With the elevation increasing,vegetation carbon density showed increase to decrease in distribution characters in the altitude scope of 4424-4804 m.The key environmental factors which effected vegetation carbon density were vegetation height,biomass 010 cm below-ground,10-20 cm below-ground biomass,0-40 cm soil moisture,0-20 cm soil bulk density,20-40 cm soil bulk density,soil organic matter,soil available potassium and soil available nitrogen.更多还原