柱花草根系与根际微生物类群的研究

对桂林毛村岩溶区和非岩溶区柱花草Stylosanthes guianensis根系与根际微生物组成多样性进行定量定性分析。结果表明，比较根系与根际3种微生物类群，两地区微生物数量变化除放线菌外都呈同一趋势，即：非岩溶区>岩溶区，且根际>侧根>主根，非岩溶区根际土壤细菌高达0.73亿个/g，岩溶区的为0.25 亿个/g。从物种丰富度看，非岩溶区柱花草根系与根际的均大于岩溶区。就主根部位来说，非岩溶区的霉菌数达12种，岩溶区的仅为6种。菌种属类鉴定得出非岩溶区中柱花草根系和根际微生物优势菌属的组成具有相似性，岩溶区的具有差异性。

Study on microbe group of Stylosanthes guianensis root and rhizosphere in Mao Village of Guilin

Qualitative research and quantitative analysis are given to microbial diversity in root and rhizosphere of Stylosanthes guianensis in karst area and non karst area. The results show that the trends in karst area are similar to that in non karst area except actinomycetes compared with the three kinds of microorganism. Which are non karst area > karst area, and rhizosphere > leteral root > taproot. The amount of rhizosphere soil bacteria in non karst area is up to 7.3×107/g dry soil, and 2.5×107/g dry soil in karst area. When viewed on species abundance from root and rhizosphere, the result also is non karst area > karst area. As to the taproot, the species of fungi in non karst area is 12 and 6 in karst area. Strain identification shows that dominant strain composition of root and rhizosphere in non karst area has similarity, while different in karst area.