Interactive effects of understory removal and fertilization on soil respiration in subtropical Eucalyptus plantations

查看全文 作　　者：Songze [1,2]Wan;Chenlu [3]Zhang;Yuanqi [1,2]Chen;Jie [4]Zhao;Xiaolin [1,2]Zhu;Jianping [5]Wu;Lixia [1]Zhou;Yongbiao [1]Lin;Zhanfeng [1]Liu;Shenglei [1]Fu

机构地区：[1]Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems,South China Botanical Garden,Chinese Academy of Science,Xingke Road No.723,Tianhe District,Guangzhou 510650,China;[2]Graduate University of the Chinese Academy of Sciences,Yuquan Road No.19,Shijingshan District,Beijing 100049,China;[3]Key laboratory of Plant Stress Biology,College of Life Science,Henan University,Minglun Street,Jinming Road,Kaifeng City,Henan 475004,China;[4]Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Yuandaer Road No.644,Furong District,Changsha 410125,China;[5]Institute of Ecology&Environmental Science,Nanchang Institute of Technology,Tianxiang Road NO.289,Gaoxin District,Nanchang 330099,China

出　　处：《Journal of Plant Ecology》索引2015年第8卷第3期,共7页

基　　金：National Science Foundation of China(31210103920,30925010,31100384);Strategic Priority Research of the Chinese Academy of Sciences(XDA05070301). 摘　　要：Aims It has been well recognized that understory vegetation plays an important role in driving forest ecosystem processes and functioning.In subtropical plantation forests,understory removal and fertiliza-tion have been widely applied;however,our understanding on how understory removal affects soil respiration and how the process is regulated by fertilization is limited.Here,we conducted an under-story removal experiment combined with fertilization to evaluate the effects of the two forest management practices and their inter-actions on soil respiration in subtropical forest in southern China.Methods The study was conducted in a split-plot design with fertilization as the whole-plot factor,understory removal as the subplot factor and block as the random factor in subtropical Eucalyptus plantations.In total,there were four treatments:control with unfertilized and intact understory(CK),understory removal but without fertilization(UR),with fertilization but without understory removal(FT)and with fertilization+understory removal(FT+UR).Eucalyptus above-and belowground biomass increment,fine root biomass,soil tempera-ture,soil moisture and soil respiration were measured in the present study.understory respiration(Ru)was quantified in different ways:Ru=RCK−Ru or Ru=RFT−R(FT+u);fertilization increased soil respiration(RFI)was also quantified in different ways:RFI=RFT−RCK or RFI=R(FT+u)−Ru.Important Findingsover a 2-year experiment,our data indicate that understory removal significantly decreased soil respiration,while fertilization increased soil respiration.understory removal decreased soil respiration by 28.8%under fertilization,but only 15.2%without fertilization.Fertilization significantly increased soil respiration by 23.6%with the presence of understory vegetation,and only increased by 3.7%when understory was removed,indicating that fertilization increased soil respiration mainly by increasing the contribution of the understory.our study advances our understanding of the interactive effects of understory management and fertilization on soil respiration in subtropical plantations. 关键词：understory removal FERTILIZATION interactive effects soil respiration subtropical plantation

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Interactive effects of understory removal and fertilization on soil respiration in subtropical Eucalyptus plantations

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