水土保持学报2011，Vol.25Issue(1)：208-213,6.
岷江上游山地森林/干旱河谷交错带不同植被恢复模式对根际土壤微生物量碳氮及固氮菌群落结构的影响
Effects of Different Revegetation Patterns in Mountain Forests-the Arid Valley Ecotone in the Upper Reaches of Minjiang River on Rhizosphere Soil Microbial Biomass C, N and the Structure of Nitrogen-fixing Bacteria Community
摘要
Abstract
We studyed the non-rhizosphere soil and the rhizosphere soil of the five revegetation patterns in mountain forest-arid valley ecotone in the upper reaches of Minjiang River,and preliminarily explored the effects on the soil microbial biomass C, N and the nitrogen-fixing bacteria community. The results show that there is a significant difference between the microbial biomasses from the rhizosphere soil and the non-rhizosphere soil in the five different vegetations, and the former is greater than the latter. The order is:Cyclobalanopsis glauca sencondary forest＞shrubbery＞Robinia pseudoacacia forest＞young plantation＞ conifer-broadleaf forest. According to the DGGE, there is a clear band both in nitrogen-fixing bacteria communities from the rhizosphere soil and the non-rhizosphere soil. The diversity of nitrogen-fixing bacteria in Robinia pseudoacacia forest and shrubberyis highest. The analysis of diversity index and community abundance show the population structure of rhizosphere soil nitrogen-fixing bacteria in shrubbery is richest, then is the Robinia pseudoacacia forest. The cluster analysis indicates the ten soil samples can be classified into four types. From above,the effect of nature recovery (Cyclobalanopsis glauca forest and shrubbery) is better than article forests(Robinia pseudoacacia forest, young plantation and conifer-broadleaf forest). Comparing in the three platations, the Robinia pseudoacacia forest is better for increasing microbial biomass and the diversity of soil nitrogenfixing bacteria structure. Taking enclosing measures in young plantations can useful for revegetation.关键词
山地森林/干旱河谷交错带/土壤微生物生物量/土壤固氮菌/变性梯度凝胶电泳/植被恢复Key words
mountain forests-the arid valley ecotone/ soil microbial biomass/ soil nitrogen-fixing bacteria/DGGE/ revegatation分类
农业科技引用本文复制引用
钟熙敏,宫渊波,陈林武,伍维翰,房建佳,张振恒,程良爽..岷江上游山地森林/干旱河谷交错带不同植被恢复模式对根际土壤微生物量碳氮及固氮菌群落结构的影响[J].水土保持学报,2011,25(1):208-213,6.基金项目
国家"十一五"科技支撑计划重大项目"长江中上游西南山区退化生态系统综合整治技术与模式"(编号:2006BAC01A11) （编号:2006BAC01A11）
四川农业大学"211工程"创新团队项目(长江上游植被恢复与重建) （长江上游植被恢复与重建）
