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  • Interspecific plant competition increases soil labile organic carbon and nitrogen contents

    Author(s)
    Wang, Miaoying
    Yang, Jing
    Gao, Hailun
    Xu, Wenshi
    Dong, Mingqiu
    Shen, Guochun
    Xu, Juan
    Xu, Xingliang
    Xue, Jianming
    Xu, Cheng-Yuan
    Zhou, Xiaoqi
    Griffith University Author(s)
    Xu, Chengyuan
    Year published
    2020
    Metadata
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    Abstract
    Plant competition can impose species-specific effects on the dynamics of soil carbon (C) and nitrogen (N) through rhizosphere processes and litter input. Therefore, it is crucial to quantify these effects in various terrestrial ecosystems for a better understanding of the mechanisms. Here, we collected subsoils containing low N from a subtropical forest and planted eight dominant tree species (two deciduous and six evergreens) in these soils in a greenhouse to explore the effects of interspecific plant competition on plant growth, soil C and N contents, and soil C and N mineralization rates after the plants had grown for 12 ...
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    Plant competition can impose species-specific effects on the dynamics of soil carbon (C) and nitrogen (N) through rhizosphere processes and litter input. Therefore, it is crucial to quantify these effects in various terrestrial ecosystems for a better understanding of the mechanisms. Here, we collected subsoils containing low N from a subtropical forest and planted eight dominant tree species (two deciduous and six evergreens) in these soils in a greenhouse to explore the effects of interspecific plant competition on plant growth, soil C and N contents, and soil C and N mineralization rates after the plants had grown for 12 months. Soil labile organic C and N contents were represented by soil extractable organic C (EOC) and extractable organic N (EON) contents. We assessed the magnitude of the interspecific plant competition via the relative interaction intensity (RII) index, which was calculated from the biomass of seedlings in the mixed treatments compared with the single treatments. Our results showed that interspecific plant competition had species-specific effects on plant biomass and soil total C and N contents as well as soil C mineralization rates, whereas it tended to decrease soil N mineralization rates. However, interspecific plant competition significantly decreased plant C and N contents, and significantly increased soil EOC and EON contents with increasing RII. After classifying the communities into two functional types (i.e., deciduous–evergreen versus evergreen–evergreen), similar relationships were observed. These findings address the importance of quantifying interspecific plant competition on soil labile organic C and N contents, which is helpful for understanding soil C and N cycling in forest ecosystems.
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    Journal Title
    Forest Ecology and Management
    Volume
    462
    DOI
    https://doi.org/10.1016/j.foreco.2020.117991
    Subject
    Environmental Sciences
    Biological Sciences
    Agricultural and Veterinary Sciences
    Science & Technology
    Life Sciences & Biomedicine
    Forestry
    Tree species
    Interspecific competition intensity
    Publication URI
    http://hdl.handle.net/10072/400681
    Collection
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