贝加尔针茅草原土壤线虫与微生物群落特征及其相互作用

Characteristics and Interaction of Soil Nematodes and Microbial Communities in Stipa Grandis Grassland

分析了在施氮环境下内蒙古贝加尔针茅草原土壤微生物和土壤线虫群落特征及相互作用。结果表明,不同的施氮水平显著影响土壤微生物真菌和细菌群落结构和数量,但对土壤微生物群落总量的影响并不显著;对土壤线虫食细菌类群(Bacterivores)、食真菌类群(Fungivores)和植物寄生性类群(Plant parasites)数量影响显著,同时影响土壤线虫的物种丰富度(SR)和群落结构的稳定性。土壤中的植物寄生性类群线虫与土壤中细菌群落、真菌群落和真菌/细菌之间呈显著正相关,土壤真菌群落与土壤线虫群落的丰富度(SR)、均匀度(J)和结构指数(WI)也有明显的相关性。施氮对土壤真菌群落的影响大于对土壤细菌群落的影响,土壤中的真菌群落与土壤中植物寄生性类群线虫具有相互促进的作用,增加了植物受线虫感染的几率,同时施氮也改变了土壤线虫的群落结构。

The characteristics and interactions of soil microbes and soil nematode communities under different levels of nitrogen application in Stipa sinensis grassland in Inner Mongolia were analyzed.As a result of the analysis,the nitrogen application significantly affected the fungal and bacterial community structure and quantity of soil microorganisms,but the effect on soil microbial community was not significant.It had a significant effect on the number of soil nematodes of bacterial groups（Bacterivores）,fungal groups（Fungivores）and plant parasite groups.It also affected the species richness（SR）of the soil nematode and the stability of the community structure.There was a significant positive correlation between soil parasitic plant nematodes and soil bacterial communities,fungal communities,and fungi/bacteria.There was also a significant correlation between soil fungal community and soil nematode community richness（SR）,evenness（J＇）and structural index（WI）.The experimental results showed that the effect of nitrogen application on the soil fungal community was greater than that on the soil bacterial community.The fungal community in the soil and the plant parasitic group nematode in the soil have mutual promoting effects,which increased the infection rate of the plant by nematodes,and nitrogen application also changed the community structure of soil nematodes.