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作 者 ：陈石;陈小云;李辉信;胡锋;刘满强

期 刊 ：应用生态学报 2009年 20卷 02期 页码：435-440

关键词：土壤；

摘 要 ：在模拟胁迫条件下(施加 CuSO₄ 的持续胁迫或加热40 ℃的瞬时胁迫)，以大麦叶粉短期分解过程代表土壤功能，采用室内培养试验研究了土壤食真菌线虫(Aphelenchus avenae)与微生物的相互作用对土壤生态功能稳定性(抗性和恢复力)的影响.结果表明：无论施加胁迫与否，食真菌线虫的活动都有促进土壤微生物活性的趋势，尤其是在施加铜胁迫后第8 天开始到培养期结束，接种食真菌线虫导致土壤基础呼吸显著增加(P<0.05)，但加热胁迫后食真菌线虫对土壤基础呼吸的促进作用仅在第8天有显著差异(P<0.05)，反映了食真菌线虫对土壤微生物活性的影响程度与胁迫类型有关.在两种胁迫条件下，接种食真菌线虫对土壤功能的抗性没有影响，但都能促进胁迫条件下土壤功能的恢复.培养后期，两种胁迫条件下接种食真菌线虫处理真菌生物量低于未接种线虫处理，表明胁迫条件下食真菌线虫对真菌的取食可能限制甚至抑制了真菌生长，导致真菌对细菌的竞争压力减少，从而使细菌获得更大的生长优势，间接促进了细菌的生长.

Abstract:In a microcosm experiment, the effects of the interaction between soil fungi-feeding nematodes and microorganisms on the soil functional stability under persistent stress of CuSO4 or transient stress of heating to 40 ℃ for 18 h were studied, with the short-term decomposition of barley leaf powder as a representative of soil function. The results showed that whether the stress existed or not, inoculation of fungi-feeding nematodes could enhance soil basal respiration, an overall indicator of soil microbial activity. Under copper stress, the soil basal respiration after the inoculation increased significantly during the period from the 8th day to the end of the experiment (P<005); while under heat stress, the promotion effect of the inoculation was only significant at the 8th day of the experiment, suggesting that the influence of fungi-feeding nematodes on soil microorganisms varied with stress type. Under the two stresses, inoculation of fungi-feeding nematodes had no influence on the resistance of soil function but could promote its recovery, and the soil fungal biomass in the late period of the experiment was lower in the treatment of inoculation than in CK, indicating that under stress condition, fungi-feeding nematodes depressed the growth and development of soil fungi, and possibly, indirectly promoted bacterial development.

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