不同退化程度高寒灌丛草甸植物量及土壤养分的变化

Changes of Biomass and Soil Nutrients in the Differently Degraded Alpine Salix paraqplesia Shrub Meadows

以高寒高山柳(Salix paraqplesia)灌丛草甸为研究对象,分析不同退化程度高寒灌丛草甸的植物量、土壤养分和土壤微生物。结果表明:随着高寒灌丛草甸退化程度的加剧,地下植物量、地上植物量、优良牧草植物量、土壤有机质、全氮及全磷都显著降低(P<0.05),但土壤微生物数量则是轻度退化灌丛草甸最高(P<0.05)。植物量、土壤有机质及全氮、土壤微生物数量与土壤含水量呈显著正相关(P<0.05);植物量、土壤全氮、土壤有机质与土壤微生物数量呈显著正相关(P<0.05)。说明,灌丛草甸的退化表现出植被、土壤的协同退化。

This paper studied quantities of microbes, soil nutrients and biomass at differently degraded alpine Salix paraqplesia shrubs meadow. The results showed that aboveground biomass, below- ground biomass, dominant herbs biomass, soil organic matter, soil total nitrogen and soil total phos- phorus significantly decreased with the increase of alpine shrub meadow degradation （P〈0.05）, but the highest number of soil microbes was detected in lightly degraded shrub site （P〈0.05）. Plant bio mass, soil organic matter and soil total nitrogen had significantly correlation with soil water content （P〈0.05）. Plant biomass, soil total nitrogen and soil organic matter were significantly positive cor- relation to soil microbes （P〈0.05）. These findings suggested degradation of plants were cooperated with soil degradation in shrub meadow.