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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4 418条土壤线虫,分别隶属于39个属.0.1 mm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0.02 mm网袋(0.49目/g凋落物干重、0.21个/g凋落物干重),并且0.1 mm网袋中的线虫数量远远大于0.02 mm网袋中的线虫数量,由此视0.1 mm网袋凋落物分解由土壤线虫和微生物共同作用,而0.02 mm网袋基本排除了土壤线虫对袋内凋落物分解的影响.0.1 mm网袋凋落物失重率和C、P元素释放率明显高于0.02 mm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.
Taking litter of Dalian National Forest Park as decomposing matrix and using different meshes of decomposition bag method to study the impact of soil nematode community on litter decomposition and nutrient elements release in urban forest, 4 418 soil nematodes were identified, Respectively belonging to 39 genera.The net relative density of soil nematode population of 0.1 mm net bag was 7.34 mesh / g dry weight of litter, and the average annual relative density of individual relative density was 1.55 / g litter dry weight, significantly higher than that of 0.02 mm net bag (0.49 mesh / g litter dry weight, 0.21 / g litter dry weight), and the number of nematodes in the 0.1 mm net bag was much larger than the nematodes in the 0.02 mm net bag, Decomposition by the soil nematode and microorganisms together, and the 0.02 mm mesh bag basically ruled out soil nematode litter decomposition of the bag.Determination of weight loss of 0.1 mm net bag litter and C, P element release rate was significantly higher than the 0.02 mm net bag , Indicating that soil nematode to some extent to promote litter decomposition and nutrient release.The weight loss rate and elemental release rate of two different net bag litter comparison showed that soil nematode litter decomposition rate of contribution of about 24% , And had a different effect on the release rate of elements, of which the impact on the release rate of N was greater, and the effect on the release rate of K was the least.The study showed that soil nematode community had significant effects on the decomposition of litter and the release of major nutrient elements Significant effect, which litter decomposition rate and N element release has a significant role in promoting.