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OALib Journal期刊
ISSN: 2333-9721
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土壤线虫群落对大连城市森林凋落物分解的影响
DOI: 10.3724/SP.J.1145.2015.05039, PP. 933-939
Keywords: 土壤线虫群落,凋落物分解,分解袋,相对密度,释放率,贡献率
Abstract:
以大连国家森林公园凋落物作为分解基质，采用不同网孔的分解袋法，开展土壤线虫群落对城市森林凋落物分解和主要养分元素释放的影响研究.研究期间共鉴定出4418条土壤线虫，分别隶属于39个属.0.1mm网袋土壤线虫类群相对密度年均值为7.34目/g凋落物干重，个体相对密度年均值为1.55个/g凋落物干重，显著高于0.02mm网袋（0.49目/g凋落物干重、0.21个/g凋落物干重），并且0.1mm网袋中的线虫数量远远大于0.02mm网袋中的线虫数量，由此视0.1mm网袋凋落物分解由土壤线虫和微生物共同作用，而0.02mm网袋基本排除了土壤线虫对袋内凋落物分解的影响.0.1mm网袋凋落物失重率和c、p元素释放率明显高于0.02mm网袋，表明土壤线虫在一定程度上促进凋落物分解和养分元素释放.两种不同网袋凋落物失重率和元素释放率的差异比较结果显示土壤线虫对凋落物分解的贡献率年均值约为24%，而对元素释放率的影响不同，其中对n元素释放率的影响较大，对k元素释放率的影响作用最小.本研究表明，土壤线虫群落对城市森林凋落物分解和主要养分元素释放有显著影响，其中对凋落物分解速率和n元素释放具有明显的促进作用.
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