Chen Shi, Chen Xiao-Yun, Li Hui-Xin, Hu Feng, Liu Man-Qiang
College of Resources & Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Ying Yong Sheng Tai Xue Bao. 2009 Feb;20(2):435-40.
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 CuSO4 or transient stress of heating to 40 degrees C 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.
在一项微观实验中，以大麦叶粉的短期分解作为土壤功能的代表，研究了以土壤真菌为食的线虫与微生物之间的相互作用对在硫酸铜持续胁迫或加热至40摄氏度18小时的短暂胁迫下土壤功能稳定性的影响。结果表明，无论是否存在胁迫，接种以真菌为食的线虫均可增强土壤基础呼吸作用，这是土壤微生物活性的一个总体指标。在铜胁迫下，接种后的土壤基础呼吸作用在实验第8天至实验结束期间显著增加（P<0.05）；而在热胁迫下，接种的促进作用仅在实验第8天显著，这表明以真菌为食的线虫对土壤微生物的影响随胁迫类型而异。在两种胁迫下，接种以真菌为食的线虫对土壤功能的抗性没有影响，但可促进其恢复，且实验后期接种处理的土壤真菌生物量低于对照，表明在胁迫条件下，以真菌为食的线虫抑制了土壤真菌的生长发育，并且可能间接促进了细菌的生长。
