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首页> 外文期刊>Ecological research >Response of the plant community and soil water status to alpine Kobresia meadow degradation gradients on the Qinghai-Tibetan Plateau, China
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Response of the plant community and soil water status to alpine Kobresia meadow degradation gradients on the Qinghai-Tibetan Plateau, China

机译：青藏高原高寒嵩草草甸退化梯度下植物群落和土壤水分状况的响应

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摘要

Degradation of alpine Kobresia meadow in the Qinghai-Tibetan Plateau is a serious problem, but its effect on the plant community and soil water status is not fully understood. We chose four homogeneous sites with < 20, 20-70, 70-90, and > 90 % absolute abundance of palatable grasses, and classified them as degradation gradient categories of poor, fair, good, and excellent, respectively. The lowest aboveground biomass and infiltration rate, and the highest root biomass, thickness of mattic epipedon, topsoil (< 10 cm) organic matter content and volumetric ratio of root/soil all occurred in fair plots. There was little fluctuation in plant community diversity and topsoil bulk density among the degradation gradients. Results of non-metric multidimensional scaling suggested that vegetation dynamics along degradation processes were non-equilibrium in the alpine Kobresia meadow. The effects of degradation on soil water content and retention were the highest in the top layer (> 10 cm). The minimum topsoil water content and maximum topsoil water retention both occurred in fair plots, indicating asynchrony between soil water content and holding capacity along degradation gradients, which likely resulted in a non-equilibrium plant community pattern through physiological desiccation and nutrient deficits. Our findings should be highly informative for threshold-based management of the degraded alpine Kobresia meadow in the future.
机译：青藏高原高寒嵩草草甸的退化是一个严重的问题，但是其对植物群落和土壤水分状况的影响尚不完全清楚。我们选择了可食用草的绝对丰度分别小于，20、20-70、70-90和> 90％的四个同质位点，并将它们分别分类为差，中等，良好和优良的退化梯度类别。地上最低的地上生物量和入渗速率，最高的根生物量，mattic epipedon的厚度，表土（<10 cm）有机质含量和根/土的体积比均发生在合理的样地中。在退化梯度之间，植物群落多样性和表土容重几乎没有波动。非度量多维标度的结果表明，高寒嵩草草甸沿退化过程的植被动态是非平衡的。降解对土壤水分和保持力的影响在顶层（> 10 cm）最高。最低表土水分含量和最大表土水分保留量均出现在公平的地块上，表明土壤水分含量与保持能力之间沿着退化梯度不同步，这可能通过生理干燥和养分亏缺导致非平衡植物群落格局。我们的发现对于将来对退化的高山嵩草草甸进行基于阈值的管理应具有很高的参考价值。

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  • 来源
    《Ecological research》 |2015年第4期|589-596|共8页
  • 作者

    Li Jing; Zhang Fawei; Lin Li; Li Hongqin; Du Yangong; Li Yikang; Cao Guangmin;

  • 作者单位

    Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China|Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China;

    Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China|Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China;

    Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China|Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China;

    Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China|Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China;

    Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China|Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China;

    Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China|Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China;

    Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810001, Qinghai, Peoples R China|Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Soil water retention; Plant community; Non-equilibrium; Mattic epipedon; Non-metric multidimensional scaling;

    机译：土壤保水;植物群落;非平衡;Mattic ped;非度量多维尺度;

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