Conversion of pure Chinese fir plantation to multi-layered mixed plantation enhances the soil aggregate stability by regulating microbial communities in subtropical China  

作　　者：Guannv Gao Xueman Huang Haocheng Xu Yi Wang Weijun Shen Wen Zhang Jinliu Yan Xiaoyan Su Shushou Liao Yeming You 

机构地区：[1]Guangxi Key Laboratory of Forest Ecology and Conservation,State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources,College of Forestry,Guangxi University,Nanning,530004,China [2]Guangxi Youyiguan Forest Ecosystem Research Station,Pingxiang,532600,Guangxi,China [3]School of Agriculture,Shenzhen Campus of Sun Yat-sen University,Shenzhen,518107,Guangdong,China [4]Institute of Resources and Environment,Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo&Rattan Science and Technology,International Centre for Bamboo and Rattan,Beijing,100102,China [5]Experimental Centre of Tropical Forestry,Chinese Academy of Forestry,Pingxiang,532600,Guangxi,China

出　　处：《Forest Ecosystems》2022年第6期823-837,共15页森林生态系统（英文版）

基　　金：the National Natural Science Foundation of China(Nos.31960240 and 32171755);the Guangxi Natural Science Foundation(No.2019GXNSFAA185023);the Scientific Research Capacity Building Project for Youyiguan Forest Ecosystem Observation and Research Station of Guangxi under Grant No.2203513003。

摘　　要：Background:Soil aggregates are the basic units of soil structure,and their stability is a key indicator of soil quality and capacity to support ecosystem functions.The impacts of various environmental factors on soil aggregates have been widely studied.However,there remains elusive knowledge on the synergistic effects of changing forest stand structure on soil aggregate stability(SAS),particularly in subtropical China where soil erosion remains a critical issue.Methods:We investigated variations in the components of soil humus(HS),including humic acids(HAs),fulvic acids(FAs),and humins(HMs),under pure Chinese fir(Cunninghamia lanceolata)plantation(PP)and multilayered mixed plantation(MP)comprising C.lanceolata,Castanopsis hystrix,and Michelia hedyosperma.The state of soil aggregate stability,was determined by three separate methods,i.e.,dry-sieving,wet-sieving,and the Le Bissonnais.High-throughput sequencing was used to determine the diversity and composition of microbial communities under PP and MP.We then built partial least squares path models(PLS-PM)for assessing the responses of SAS to the variations in soil microorganisms and HS components.Results:The MP stands had significantly greater SAS(P<0.05),higher content of HAs and more rapid organic matter humification within aggregates,than the PP stands.High-throughput sequencing confirmed that the Pielou andα-diversity index values(Chao1 and Shannon)for fungi were all significantly higher under MP than under PP,while no marked difference was found in bacterialα-diversity between the two plantation types.Moreover,there were markedly greater abundance of three bacterial phyla(Verrucomicrobia,Chloroflexi,and Gemmatimonadetes)and three fungal phyla(Ascomycota,Kickxellomycota,and Glomeromycota),and significantly less abundance of two bacterial phyla(Planctomycetes and Firmicutes)and four fungal phyla(Basidiomycota,Mortierellomycota,Mucoromycota,and Rozellomycota)under MP than under PP.The Chloroflexi and Ascomycota phyla appeared to be the primary drivers of soil

关 键 词：Broadleaved tree species Chinese fir plantation Soil aggregate stability HUMUS Bacterial and fungal communities High-throughput sequencing 

分 类 号：S714.3[农业科学—林学]