醉马草内生真菌共生体对土壤微生物和养分的影响

Effects of Achnatherum inebrians/Neotyphodium endophyte symbiont on microflora and nutrient of soil

本研究以我国西北部天然草原广泛分布的烈性毒草醉马草(Achnatherum inebrians)为对象,分析内生真菌共生体对根系土壤中微生物区系和养分的影响。结果表明,采自桑科、甘加和榆中3个地区的醉马草根际土壤中真菌数量为其伴生种根际土壤中对应菌的1.31～1.56倍、细菌数量为1.56～2.65倍。土壤营养成分测定结果表明,醉马草根际土壤中有机质、全氮、速效磷和速效钾的含量均显著高于其伴生种,而全磷和全钾含量差异不显著。

Drunken horse grass （Achnatherum inebrians）, is a kind of intoxicating grass growing on native grassland in Northwestern China. The aim of this research is to determine the effects of endophyte infected （E＋） A. inebrians on the quantity of soil microbes and nutrient components of rhizosphere soil of accompanying species. The results indicated that the quantity of soil fungi was 1.33 1.55 times than accompan- ying species in Sangke, Ganjia and Yuzhong, where soil bacteria was 1.60-2.65 times. The measurement results of soil nutrients showed that organic matter, total nitrogen, available phosphorus and available potassium of rhizosphere soil of A. inebrians were higher than those of accompanying species. However, the content of total phosphorus and total potassium had no significant effects on the rhizosphere soil of A. inebrians and accompanying species.