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The Response of Vegetation Biomass to Soil Properties along Degradation Gradients of Alpine Meadow at Zoige Plateau

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Abstract

Alpine grassland of the Tibetan Plateau has undergone severe degradation, even desertification. However, several questions remain to be answered, especially the response mechanisms of vegetation biomass to soil properties. In this study, an experiment on degradation gradients was conducted in an alpine meadow at the Zoige Plateau in 2017. Both vegetation characteristics and soil properties were observed during the peak season of plant growth. The classification and regression tree model (CART) and structural equation modelling (SEM) were applied to screen the main factors that govern the vegetation dynamics and explore the interaction of these screened factors. Both aboveground biomass (AGB) and belowground biomass (BGB) experienced a remarkable decrease along the degradation gradients. All soil properties experienced significant variations along the degradation gradients at the 0.05 significance level. Soil physical and chemical properties explained 54.78% of the variation in vegetation biomass along the degradation gradients. AGB was mainly influenced by soil water content (SWC), soil bulk density (SBD), soil organic carbon (SOC), soil total nitrogen (STN), and pH. Soil available nitrogen (SAN), SOC and pH, had significant influence on BGB. Most soil properties had positive effects on AGB and BGB, while SBD and pH had a slightly negative effect on AGB and BGB. The correlations of SWC with AGB and BGB were relatively less significant than those of other soil properties. Our results highlighted that the soil properties played important roles in regulating vegetation dynamics along the degradation gradients and that SWC is not the main factor limiting plant growth in the humid Zoige region. Our results can provide guidance for the restoration and improvement of degraded alpine grasslands on the Tibetan Plateau.

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Authors and Affiliations

  1. Synthesis Research Centre of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China

    Miao Liu, Zhenchao Zhang, Jian Sun, Ming Xu & Baibing Ma

  2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China

    Jian Sun

  3. Department of Ecology, Evolution, and Natural Resources, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, New Jersey, 08901, USA

    Ming Xu & Sadiy Baba Tijjani

  4. The College of Environment and Planning of Henan University, Kaifeng, 475004, China

    Ming Xu

  5. University of Chinese Academy of Sciences, Beijing, 100049, China

    Baibing Ma

  6. Institute of Qinghai-Tibetan Plateau, Southwest Minzu University, Chengdu, 610041, China

    Youjun Chen & Qingping Zhou

Authors
  1. Miao Liu
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  2. Zhenchao Zhang
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  3. Jian Sun
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  4. Ming Xu
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  5. Baibing Ma
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  7. Youjun Chen
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  8. Qingping Zhou
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Correspondence to Jian Sun or Ming Xu.

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Foundation item: Under the auspices of the China Postdoctoral Science Foundation (No. 2017M620889), the Second Tibetan Plateau Scientific Expedition and Research Program (No. 2019QZKK0405-05), the State Key Research Development Program of China (No. 2016YFC0501803, 2016YFC0501802)

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Liu, M., Zhang, Z., Sun, J. et al. The Response of Vegetation Biomass to Soil Properties along Degradation Gradients of Alpine Meadow at Zoige Plateau. Chin. Geogr. Sci. 30, 446–455 (2020). https://doi.org/10.1007/s11769-020-1116-1

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