互花米草入侵对湿地土壤微生物群落的影响

Effects of Invasive Species Spartina alternifora on Soil Microbial Community of Wetland

通过比较江苏沿海滩涂相邻区域互花米草(Spartina alterniflora)与盐地碱蓬(Suaeda salsa)根区、非根区土壤的理化性质和微生物活性差异,以确定植物根系对土壤环境和微生物群落的影响。结果表明,盐地碱蓬土壤有机碳、微生物生物量碳、微生物数量及其活性均高于互花米草土壤;土壤微生物数量及其活性随季节波动,春季最低,随后开始逐渐提高,夏季达到最高值,之后降低;植物根系的分布有利于微生物的生长及其活性的提高。研究结果还表明,植被的差异显著影响土壤环境和微生物群落,因此应重新考虑互花米草的引种策略。

The soil characteristics and microbial community of rhizosphere and non-rhizosphere soils of Spartina alterniflora and Suaeda salsa in areas adjacent to coastal beach of Jiangsu province were compared to determine the effects of plant roots on soil environment and microbial community. Results showed that organic carbon, microbial biomass carbon, microbial population and activities in S. salsa soil were higher than that in S. alterniflora soil. The total number of microorganisms and microbial activity showed seasonal fluctuation of increasing from spring through summer and then declining gradually to the lowest value in spring. The distribution of plant root was beneficial to microorganisms growth and its activity. It was concluded that difference in vegetation cover significantly affected soil environment and microbial community. It was suggested that importing S. alternifora into this area should be reconsidered.