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

作　　者：Songze Wan Chenlu Zhang Yuanqi Chen Jie Zhao Xiaolin Zhu Jianping Wu Lixia Zhou Yongbiao Lin Zhanfeng Liu Shenglei 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》2015年第3期284-290,共7页植物生态学报（英文版）

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 m

关 键 词：understory removal FERTILIZATION interactive effects soil respiration subtropical plantation 

分 类 号：S15[农业科学—土壤学]