藏北高寒草甸土壤线虫群落对围封及自由放牧的响应

发布时间：2018-04-24 04:11

本文选题：土壤线虫 + 生物多样性　；参考：《土壤学报》2017年02期

【摘要】：为了解放牧干扰对藏北高寒草甸的影响,以及连续围封措施对草地的恢复作用,2013—2015年连续3年对那曲县围封、自由放牧天然高寒草甸土壤线虫群落进行取样调查及数据分析。结果表明:围封、放牧样地的线虫个体数量在年际间的变化均较明显,植食性线虫是整个线虫群落个体数量变化的主要贡献者;围封样地的线虫个体密度、多样性指数H′、丰富度指数SR,以及优势度指数λ的年际变化幅度均大于放牧样地;食细菌性线虫个体数量及线虫通路比值(NCR)表明放牧样地的有机质转化效率高于围封样地;成熟度指数(MI)、植物寄生线虫指数(PPI)分析表明,所研究区域经5年围封,高寒草甸生态系统稳定性没有明显的提高,相反,现有放牧强度维持或者增加了线虫群落的物种多样性,利于物种共存和草地生态系统稳定性的维持。
[Abstract]:In order to understand the effect of grazing disturbance on alpine meadow in northern Tibet, and the effect of continuous enclosure measures on grassland restoration, sampling investigation and data analysis of soil nematode communities in natural alpine meadow of Naqu County for 3 consecutive years from 2013 to 2015 were carried out. The results showed that the individual numbers of nematodes in enclosed and grazing plots were significantly different from year to year. Phytophagous nematodes were the main contributors to the individual population change of the whole nematode community, and the individual density and diversity index of nematodes in the enclosed plots. The interannual variation of richness index SRand dominance index 位 was larger than that of grazing land, and the individual number of bacterial nematode and the ratio of nematode pathway to NCRs showed that the conversion efficiency of organic matter in grazing land was higher than that in enclosed plot. The analysis of maturity index and plant parasitic nematode index (PPI) showed that the stability of alpine meadow ecosystem was not significantly improved after 5 years of enclosure. On the contrary, the current grazing intensity maintained or increased the species diversity of nematode community. It is beneficial to species coexistence and the maintenance of grassland ecosystem stability.
【作者单位】：西藏农牧学院资源与环境学院;西藏农牧学院高原生态研究所;
【基金】：国家自然科学基金项目(31260144,31660155) 西藏特色农牧资源研发协同创新中心高原生态项目资助~~
【分类号】：S812

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