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首页> 外文期刊>Clean >Rapid Expansion of Melica przewalskyi Causes Soil Moisture Deficit and Vegetation Degradation in Subalpine Meadows
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Rapid Expansion of Melica przewalskyi Causes Soil Moisture Deficit and Vegetation Degradation in Subalpine Meadows

机译：山茱ze的快速膨胀导致亚高山草甸土壤水分亏缺和植被退化

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摘要

Invasive noxious plants have important impacts on community dynamics and ecosystem functions in grasslands. Since the 1960s, the noxious plant Melica przewalskyi has spread rapidly and formed different size of patches in subalpine meadows of the Qilian Mountains, Northwest China. In this study, the species richness, vegetation structure, and soil water content are investigated from the patch edge to the center in four sizes of M. przewalskyi patches (i.e., small patch, <100cm in canopy diameter; middle patch, 100-200 cm; large patch, 200-300 cm; and the largest patch, >300cm). The results show that while the patches grow continuously, the dominant species changes from Stipa krylovii to M. przewalskyi with an increasing trend in plant productivity and decreasing trend in species richness and soil water content. Plant height, density, coverage, and above-ground biomass of M. przewalskyi population increases from the patch edge to the center in small, middle, and large patches, whereas it is precisely the opposite in the largest patch. Interestingly, soil water content exhibits a decreasing trend from the patch edge to the center in all patches. The results indicate that the rapid spread of M. przewalskyi may well alter vegetation pattern and cause a severe soil moisture deficit, which would further drive the degradation of ecosystem functioning in subalpine meadows.
机译：入侵性有害植物对草原的群落动态和生态系统功能具有重要影响。自1960年代以来，有毒植物Melica przewalskyi迅速传播，并在中国西北祁连山亚高山草甸上形成了不同大小的斑块。在这项研究中，从斑节边缘到中心的四种大小的斑节对虾的物种丰富度，植被结构和土壤水分进行了研究（即小斑块，冠层直径<100cm；中间斑块，100-200）厘米；大补丁，200-300厘米；最大补丁，> 300厘米）。结果表明，在斑块持续生长的同时，优势种从针叶茅变到毛泽东麦草，植物生产力增加，物种丰富度和土壤含水量减少。在小，中和大斑块中，毛泽尔摩西蝇种群的株高，密度，覆盖度和地上生物量从斑块边缘到中心增加，而在最大斑块中恰好相反。有趣的是，在所有斑块中，土壤含水量从斑块边缘到中心都呈现出下降的趋势。结果表明，M。przewalskyi的迅速传播可能会很好地改变植被格局，并导致严重的土壤水分缺乏，这将进一步推动亚高山草甸生态系统功能的退化。

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  • 来源
    《Clean》 |2018年第1期|1700587.1-1700587.7|共7页
  • 作者

    Gao Fu-Yuan; Shi Fu-Xi; Chen Hui-Min; Zhang Xin-Hou; Yu Xue-Yang; Cui Qian; Zhao Cheng-Zhang;

  • 作者单位

    Lanzhou Univ, Minist Educ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, 222 Tianshui South Rd, Lanzhou 730000, Gansu, Peoples R China;

    Lanzhou Univ, Minist Educ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, 222 Tianshui South Rd, Lanzhou 730000, Gansu, Peoples R China|Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, 4888 Shengbei Rd, Changchun 130102, Jilin, Peoples R China;

    Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, 4888 Shengbei Rd, Changchun 130102, Jilin, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, 4888 Shengbei Rd, Changchun 130102, Jilin, Peoples R China;

    Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, 4888 Shengbei Rd, Changchun 130102, Jilin, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, 4888 Shengbei Rd, Changchun 130102, Jilin, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Northwest Normal Univ, Coll Geog & Environm Sci, Res Ctr Wetland Resources Protect & Ind Dev Engn, 967 Anning East Rd, Lanzhou 730070, Gansu, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    invasive noxious plants; patch; Qilian Mountains; soil water content; spatial distribution pattern;

    机译：外来入侵有害植物;斑块;祁连山;土壤水分;空间分布格局;

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