生态学报2017，Vol.37Issue(21)：7293-7303,11.DOI:10.5846/stxb201608141667
闽江河口红树林土壤微生物群落对互花米草入侵的响应
Soil microbial community of mangrove forests and its responses to the invasion of Spartina alterniflora in the Minjiang River Estuary
摘要
Abstract
In the present study,soil microbial communities of mangrove forests and its responses to the invasion of Spartina alterniflora were analyzed using phospholipid fatty acid analysis (PLFA).Soil physic-chemical properties and enzyme activities were measured in the Minjiang River Estuary.The results showed that:There were 22 PLFAs that were significantly different in soil samples from mangrove communities (MC),Mangrove-S.alterniflora (MS),and S.alterniflora communities (SC).The MS soil exhibited richer PLFAs than the other vegetation types.The physic-chemical properties and enzyme activities in soils of different vegetation communities were in the order of MC ＞ MS ＞ SC.Following the invasion of S.alterniflora,the soil microbial biomass of mangrove communities increased,and the physic-chemical properties,enzyme activities significantly decreased,and the quality of mangrove wetland soil was degraded.The PLFAs biomarkers of three species with the highest contents were 16∶0,16∶1w7c,9Me15∶0w,and 18∶1w12c.There was a significant difference in the relative biomass of soil microbial biomass.Bacteria exhibited the richest distribution,followed by fungus,actinomycetes,and protozoans.Community diversity indices showed a similar pattern,MS soil microbial community diversity indexes were less than those of MC.The soil microbial community diversity indexes decreased following the invasion of S.alterniflora.Principal component analysis was able to distinguish the characteristics of microbial communities in different vegetation communities.The soil physic-chemical properties were closely correlated with enzyme activities,and SOC,TN,sucrose,and catalase were significantly correlated with the PLFAs of gram-positive bacteria and actinomycetes.The results of this study showed that the invasion of S.alterniflora has the potential to affect nutrient metabolism in the mangrove community,especially with regard to the C,N and P cycles,and the enzyme activities.S.alterniflora can change the microbial biomass to create favorable soil environments for their growth to achieve the rapid invasion.关键词
互花米草/红树林/土壤微生物/PLFA/外来植物入侵Key words
Spartina alterniflora/mangrove/soil microbial community/PLFA/exotic plant invasion引用本文复制引用
郑洁,刘金福,吴则焰,洪伟,何中声,蓝亦琦,刘思迪..闽江河口红树林土壤微生物群落对互花米草入侵的响应[J].生态学报,2017,37(21):7293-7303,11.基金项目
国家自然科学基金(31500443) （31500443）
福建省科技厅引导性项目(2015Y0042) （2015Y0042）
福建省林业科学研究项目(K8514002A) （K8514002A）
福建省教育厅中青年教师科研项目(JA15178) （JA15178）
