林下植物剔除对毛竹林土壤微生物群落结构的影响  

Effects of understory removal on soil microbial community composition in subtropical Phyllostachys edulis plantations

作　　者：肖意 陈慧娴 邱丽君 张扬[1] 万松泽 XIAO Yi;CHEN Hui-xian;QIU Li-jun;ZHANG Yang;WAN Song-ze(Key Laboratory of Forest Ecosystem Protection and Restoration in Poyang Lake Watershed,Jiangxi Agricultural University,Nanchang 330045,China;Jiangxi Provincial Key Laboratory-far Bamboo Germplasm Resources and Utlization,College of Forestry,Jiangxi Agricultural University,Nanchang 330045,China)

机构地区：[1]江西农业大学鄱阳湖流域森林生态系统保护与修复国家林业和草原局重点实验室,南昌330045 [2]江西农业大学林学院江西省竹子种质资源与利用重点实验室,南昌330045

出　　处：《应用生态学报》2021年第9期3089-3096,共8页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41867007);中央财政林业科技推广示范项目(JXTG[2021]14)资助。

摘　　要：本研究以中亚热带地区广泛分布的毛竹林为对象,采用随机区组实验设计,分析了林下植物剔除对毛竹林土壤微生物群落结构和土壤理化特性的影响,探讨林下植物对毛竹林土壤微生物群落结构的调控机制。结果表明:林下植物剔除对土壤理化特性产生显著影响,主要表现为土壤全氮、硝态氮和有效磷含量增加,而土壤铵态氮、全磷含量及土壤pH值降低。此外,林下植物剔除显著降低了总微生物和细菌(B)的PLFAs,增加了真菌(F)PLFAs,从而增加了F/B值。冗余分析表明,林下植物剔除驱动下的土壤pH值降低是土壤真菌含量增加的主要原因;而全磷含量及pH值的降低是土壤细菌含量显著降低的主要原因,其中i14:0、i15:0及i16:0含量的降低主导了细菌总量的降低。毛竹林剔除林下植物降低了土壤微生物生物量,使微生物群落结构由细菌为主导向真菌为主导转移,可能降低微生物的分解功能。建议在发展毛竹人工林过程中保留林下植物。We investigated the effects of understory removal on soil microbial community and soil physicochemical properties in a field experiment following random block design in subtropical moso bamboo(Phyllostachys edulis)plantations,which were widely contributed in middle subtropical area,aiming to assess the regulation mechanism of understory plants on soil microbial community.The results showed that understory removal significantly increased the contents of soil N,NO3--N,and soil available phosphorus,but decreased soil pH and the contents of soil NH4+-N and soil phosphorus(TP).Moreover,understory removal decreased total and bacterial PLFAs(B)and increasing soil fungal PLFAs(F),resulting in a higher F/B ratio.Redundancy analysis showed that changes in fungal PLFAs caused by understory removal were mainly attributed to soil acidification,while changes in bacterial PLFAs caused by understory removal were mainly due to the decreases in soil TP and pH.Furthermore,i14:0、i15:0 and i16:0 contributed to the decreases in bacterial biomass.Our results suggested that understory removal might not be suitable for the management of subtropical P.edulis plantations,as it would alter microbial community composition.The shift of soil microbial community from bacteria to fungi could inhibit microbial decomposition function.

关 键 词：林下植物 微生物群落结构 磷脂脂肪酸 毛竹林 人工经营管理 

分 类 号：S714[农业科学—林学]