甘肃定西华家岭土壤纤毛虫群落对生态恢复的响应

Response of the soil ciliate community to ecological restoration in Huajialing,Dingxi,Gansu

为了解土壤纤毛虫群落对生态恢复下的土壤环境的响应,于2007年9月—2008年8月用活体观察法和"三级十倍环式稀释法"对甘肃定西华家岭5个不同恢复阶段的人工云杉林和1个荒草坡对照点的土壤纤毛虫群落以及季节动态进行了研究,探讨了土壤纤毛虫群落组成对生态恢复下土壤环境的相关性。共鉴定到127种纤毛虫,隶属于3纲9目34科50属。研究发现,各不同恢复年限土样中土壤纤毛虫的物种分布存在明显差异,并随恢复时间的延长,样点间物种相似性减小,群落组成复杂化,丰度、物种数和物种多样性指数均呈上升趋势。优势类群也发生了响应,由I号对照样点和恢复初期II号样点的肾形目变为恢复后期样点的下毛目。结果显示,土壤纤毛虫群落动态很好地响应了生态恢复过程中土壤环境条件的变化。土壤纤毛虫群落可用于陆地生态恢复评价,但要建立有效可行的、具有普遍意义的评价指标体系,尚需大量的和系统的工作。

To obtain a better understanding of the responses of soil ciliate communities to ecological restoration,a quarterly survey of the soil ciliate community and seasonal dynamics across five sampling sites of artificial spruce forest was undertaken.A contrast sampling site of wild grassland was used and live observation ciliates and the three level ten-fold dilution method was used in Huajialing,Dingxi,Gansu.A total of 127 species were identified,belonging to three classes,nine orders,34 families and 50 genera.Results show that the species distribution had obvious differences across the sampling sites,the community structure of soil tended to be complicated and species comparability decreased gradually with the number of restoration years,and abundance,species richness and species diversity index showed an upward trend.The dominant groups of soil ciliates changed during ecological restoration.Colpodida was the dominant group in sampling site I and site II,whereas Hypotrichida was the dominant group in the late recovery sampling sites.This study shows that the dynamics of the soil ciliate community better respond to soil condition changes in the ecological restoration process.Although the soil ciliate community can be used to evaluate the effect of ecological restoration of terrestrial ecosystems,plenty of further systematic research to establish an effective and feasible evaluation index system is required.