Impact of Robinia pseudoacacia stand conversion on soil properties and bacterial community composition in Mount Tai,China

查看全文 作　　者：Kun [1]Li;Xu [1]Han;Ruiqiang [1]Ni;Ge [1]Shi;Sergio de-[2,3]Miguel;Chuanrong [1]Li;Weixing [4]Shen;Yikun [4]Zhang;Xingzhong [4]Zhang

机构地区：[1]Mountain Tai Forest Ecosystem Research Station of State Forestry Administration/Key Laboratory of State Forestry Administration for Silviculture of the Lower Yellow River,Tai’an 271018,Shandong,China;[2]Department of Crop and Forest Sciences,University of Lleida,Av.Alcalde Rovira Roure 191,E25198 Lleida,Spain;[3]Joint Research Unit CTFC–AGROTECNIO,Av.Alcalde Rovira Roure 191,E25198 Lleida,Spain;[4]Mount Tai Scenic Spot Management Committee Tai’an 271000,Shandong,China

出　　处：《Forest Ecosystems》索引2021年第8卷第2期,共12页

基　　金：financially supported by the Special Fund for Forestry Scientific Research in the Public Interest No.201504406;the National Natural Science Foundation of China(Nos.31570705,31500362,31700553);the Shandong Provincial Natural Science Foundation,China(No.ZR2016CP01);the Project of Shandong Province Higher Educational Science and Technology Program(No.J16LF09);China Scholarship Council(No.201809135006);The contribution of S.de-Miguel was supported by the Spanish Ministry of Economy and Competitivity(MINECO)(Grant No.RTI2018–099315-A-I00);by a Serra-Húnter Fellowship provided by the Generalitat of Catalonia。 摘　　要：Background:Robinia pseudoacacia is a widely planted pioneer tree species in reforestations on barren mountains in northern China.Because of its nitrogen-fixing ability,it can play a positive role in soil and forest restoration.After clearcutting of planted stands,R.pseudoacacia stands become coppice plantations.The impacts of shifting from seedling to coppice stands on soil bacterial community and soil properties have not been wel described.This study aims to quantify how soil properties and bacterial community composition vary between planted seedling versus coppice stands.Methods:Nine 20 m×20 m plots were randomly selected in seedling and coppice stands.The bulk soil and rhizosphere soil were sampled in summer 2017.Bulk soil was sampled at 10 cm from the soil surface using a soil auger.Rhizosphere soil samples were col ected using a brush.The soil samples were transported to the laboratory for chemical analysis,and bacterial community composition and diversity was obtained through DNA extraction,16 S r RNA gene amplification and high-throughput sequencing.Results:The results showed that,compared to seedling plantations,soil quality decreased significantly in coppice stands,but without affecting soil exchangeable Mg^(2+) and K^(+).Total carbon(C)and nitrogen(N)were lower in the rhizosphere than in bulk soil,whereas nutrient availability showed an opposite trend.The conversion from seedling to coppice plantations was also related to significant differences in soil bacterial community structure and to the reduction of soil bacterialα-diversity.Principal component analysis(PCA)showed that bacterial community composition was similar in both bulk and rhizosphere soils in second-generation coppice plantations.Special y,the conversion from seedling to coppice stands increased the relative abundance of Proteobacteria and Rhizobium,but reduced that of Actinobacteria,which may result in a decline of soil nutrient availability.Mantel tests revealed that C,N,soil organic matter(SOM),nitrate nitrogen(NO^(-)+(3)-N)and available phosphorus positively correlated with bacterial community composition,while a variation partition analysis(VPA)showed that NO^(-)+(3)-N explained a relatively greater proportion of bacterial distribution(15.12%),compared with C and SOM.Surprisingly,N showed no relationship with bacterial community composition,which may be related to nitrogen transportation.Conclusions:The conversion from seedling to coppice stands reduced soil quality and led to spatial-temporal homogenization of the soil bacterial community structure in both the rhizosphere and bulk soils.Such imbalance in microbial structure can accelerate the decline of R.pseudoacacia.This may affect the role of R.pseudoacacia coppice stands in soil and forest restoration of barren lands in mountain areas. 关键词：Black locust coppice plantation Forest restoration AFFORESTATION Microbial structure Soil nutrient Soil quality

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Impact of Robinia pseudoacacia stand conversion on soil properties and bacterial community composition in Mount Tai,China

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