【摘要】 为了解高寒沙化草地土壤团聚体组成及其有机碳含量变化特征,对若尔盖四种不同沙化程度的高寒草地土壤团聚体有机碳进行了比较分析。结果表明:在川西北高寒草地中,随着草地沙化程度加剧,土壤中团聚体组成变化明显。当高寒草地从中度沙化向重度沙化转变阶段,≤0.25mm粒级团聚体的增加及0.5-2mm粒级团聚体的减少都较为显著。随着草地沙化程度的增加,土壤各粒级团聚体有机碳含量总体呈下降趋势,并且土壤团聚体有机碳含量的显著下降发生在草地从中度沙化向重度沙化转变阶段。更多还原

【Abstract】 Tounderstand the composition and organic carbon characteristics of soil aggregates in alpine desertification grassland,the soil aggregate organic carbon of four desertificationgrasslands in Zoigewas compared.The results showed that the composition of soil aggregates changed significantly with the increase of grassland desertification in the alpine grassland of northwestern Sichuan.When the alpine grassland change from moderate to severe desertification level,the increase of≤0.25 mm aggregates and the decrease of 0.5-2 mm aggregates werequite significant.Theorganic carbon content ofsoil aggregates showed a decreasing trendwith the aggravation of grassland desertification level,and theorganic carbon content of soil aggregatesdecreased significantlyat the stage oftransition from moderate to severe desertification.更多还原