小兴安岭森林落叶分解与土壤动物的作用

在小兴安岭地区对 12种落叶分解过程和土壤动物作用进行了研究。采用不同网孔分解样袋 ,排出不同类别土壤动物作用的方法。结果表明 ,落叶分解消耗率 :大孔 >小孔 >对照 ,即大型、中小型土壤动物和微生物的共同作用 >中小型土壤动物和微生物的共同作用 >只微生物的作用。三年平均分解消耗率分别是 2 8.9% (大孔 )、 2 8.2 % (小孔 )和 2 6.2 % (对照 ) ,到第三年末 ,三种样袋 12种落叶平均分解程度分别达到 86.7% (大孔 )、 84 .6% (小孔 )和 78.7% (对照 )。分解初期土壤动物的作用逐渐增大 ,到第二年 10月土壤动物的作用达到了最大值 ,随后土壤动物的作用逐渐降低 ,大型土壤动物的作用小于中小型土壤动物的作用。落叶种类不同 ,分解时间不同 ,土壤动物作用也不同。

Decomposition of forest defoliation and role of soil animals in Xiao Hinggan Mountains

Study on the decomposition of 12 kinds of forest defoliation and the role of soil animals in Pinus koraiensisbroad-leaved mixed forest and spruce-fir of Xiao Hinggan Mountains.The method of eliminating the role of soil animals of different groups from different mesh decomposition bags was adopted.The results show that the decomposition efficiency of the defoliation is large mesh > small mesh >check, that is to say the role of large-type and middle-small-type soil animals and microorganism > the role of middle-small-type soil animals and microorganism > the role of microorganism only.The average decomposition efficiency of three years is 28.9%(large mesh), 28.2%(small mesh) and 26.2%(check mesh).By the end of the third year, the degree of decomposition of three kinds of mesh bags is 86.7%(large mesh), 84.6%(small mesh) and 78.7% (check mesh). The decomposition of latifoliate defoliation is entirely higher than conifer defoliation in three kinds of mesh bags.In latifoliate defoliation, the decomposition degree of Phellodondron amuriensis,Fraxinus mandshurica,Ulmus laciniata,Juglans mandshurica andAcer mono is the highest.But in conifer defoliation, the decomposition degree of Pinus koraiensis is the highest.From the decomposition of 12 kinds of defoliations in 3 years, the decomposition of defoliation is effected not only by large-size soil animals but also by middle-small-size soil animals, but the degree of function is different.In the prophase of decomposition, the role of soil animals was gradually increasing and the biggest value appeared in October of the second year.Subsequently, the sole of soil animals was decreasing, and the role of large-type soil animals > the role of middle-small-type soil animals.The role of soil animals is different when the kind of defoliation and the time of decomposition are different.