羊草草原主要凋落物分解及土壤动物的作用

对羊草草原主要植物凋落物的分解及分解过程中土壤动物群落作用的研究结果表明,不同凋落物以及在不同网孔网袋中的分解速率存在差异,不同凋落物以虎尾草分解速率最快, 在4和2 mm网袋中分解速率明显快于0.01 mm网袋。凋落物分解过程中土壤动物群落组成以革螨亚目,辐螨亚目和甲螨亚目为优势类群;长蝽科、啮虫科、土蝽科、山跳虫科、驼蝽科、等节跳虫科和管尾亚目为常见类群。 土壤动物促进了凋落物的分解,不同类型土壤动物在凋落物分解中的贡献不同,中小型土壤动物起到最为显著的促进作用。凋落物重量损失率同土壤动物群落特征的相关分析结果显示,羊草草原凋落物的重量损失率与土壤动物群落的多样性指数、丰富度指数间存在显著的负相关关系,而凋落物重量损失与土壤动物群落其他特征无明显相关关系。

Main species litter decomposition and function of soil fauna in Leymus chinensis grassland

This study is on the decomposition of main species litter and the function of soil fauna in Leymus chinensis grassland.The results show that there are differences in decomposition rate both among litter species and mesh bags.Chloris virgata litter decomposes fastest,meanwhile litter in 4 and 2 mm mesh bags have higher decomposition rates than those in 0.01 mm mesh bags.For the composition of soil fauna community in litter decomposition process,Gamasida,Actinedida and Oribatida are dominant groups,while Lygaeidae,Psocidae,Cydnidae,Pseudachorutidae,Microphysidae,Isotomidae and Tubalifera are common groups.Soil fauna community has generally accelerated the rates of litter decomposition,but the contributions of macro and mesh-micro soil fauna are different.Mesh-micro soil fauna has a stronger role of promoting the litter decomposition.The pearson correlation analysis indicates there is a significant negative relationship between litter mass loss percent and diversity index of soil fauna community,while the relationship does not exist between other soil fauna community characters and litter mass loss percent.