滨河湿地不同植被恢复模式土壤微生物分布特征

Distribution characters of soil microbial population in the restored riparian wetland

对河滩退耕地恢复为湿地植被后典型湿地植被群落不同沉积层的土壤微生物变化特征进行了初步研究.结果表明,河滩退耕地恢复前后,土壤中的微生物主要集中在0～10 cm的表土层,其数量以细菌占绝对优势(占微生物总数的62.87%～96.64%);随深度的增加,细菌数量呈递减趋势,放线菌数量呈递增趋势,真菌数量则变化不明显.同时,退耕恢复后,3类微生物数量呈增加趋势,说明经过一个恢复周期后,植物群落恢复对土壤微生物的数量产生了显著影响.细菌数量与全氮和有机质呈显著相关(p<0.05),说明土壤主要养分在一定程度上影响了细菌分布.

This paper generally describes the distribution characteristics of soil microbial population in different soil layers of different wetland vegetation communities after artificial restoration. The results show that the bacteria takes up the biggest share in .total soil microorganism, and the proportion reaches 62.87% - 96.64% . Most of soil microorganism are present in the upper 0 - 10 cm layer. The bacteria quantity decreases and the actinomycetes quantity increases with soil depth increasing, but the variation of fungus is not significant. The total amounts of three kinds microbes increase after wetland restoration, which show that wetland vegetation restoration has made a significant influence on microbial population after a growth cycle. The bacteria quantity has significant correlation with soil TN and OM （p 〈0.05 ） , which show that the soil nutrient affects the distribution of bacteria in some degree.