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首页> 外文期刊>Ecological research >Diversity effects under different nutrient addition and cutting frequency environments in experimental plant communities
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Diversity effects under different nutrient addition and cutting frequency environments in experimental plant communities

机译：试验植物群落中不同养分添加和切削频率环境下的多样性效应

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摘要

The effects of biodiversity on productivity have been well studied in the past decades. However, the responses of these biodiversity effects to modern grassland managements have not been explicitly tested. By establishing a five years diversity-manipulated experiment with different cutting frequency and nutrient addition levels, we explored the changes of biodiversity effects and the underlying mechanisms under these managements. Our results showed that community biomass increased with species richness. The correlations were observed under all management regimes, but their strengths varied with management intensity. The net biodiversity effects (NE) increased with nutrient supply, but reduced with frequent cutting. These two factors also interactively influenced NE. Importantly, their influences could last 5 years or longer. The NE changes mainly resulted from the variations of complementarity effects (CE), i.e., the aboveground space partitioning of our species. However, the selection effects (SE) were minimally influenced by nutrient addition and cutting frequency, indicating that under these conditions our species had comparably competitive strength. Especially, CE increased over time in highly cutting subplots, suggesting that this relationship was condition-dependent. We conclude that biodiversity is vitally important for ecosystem functioning even when the ecosystems are disturbed by human activities, and is most effective in enhancing biomass productivity under nutrient supply and low cutting frequency conditions. Field studies with species that come from other functional groups are needed to draw a more general conclusion.
机译：在过去的几十年中，已经对生物多样性对生产力的影响进行了深入研究。但是，这些生物多样性对现代草地管理的反应尚未得到明确测试。通过建立一个为期五年的，不同采伐频率和营养添加水平的多样性控制实验，我们探索了在这些管理下生物多样性影响的变化及其潜在机制。我们的结果表明，群落生物量随物种丰富度的增加而增加。在所有管理制度下均观察到相关性，但它们的强度随管理强度而变化。净生物多样性影响（NE）随着养分供应的增加而增加，但随着频繁砍伐而降低。这两个因素也对NE产生交互影响。重要的是，他们的影响可能会持续5年或更长时间。 NE的变化主要来自互补效应（CE）的变化，即我们物种的地上空间划分。然而，选择效应（SE）受养分添加和切割频率的影响很小，这表明在这些条件下我们的物种具有相当的竞争实力。尤其是，在高度切割的子图中，CE随时间增加，表明这种关系是条件依赖性的。我们得出的结论是，即使生态系统受到人类活动的干扰，生物多样性对于生态系统的功能也至关重要，并且在营养供应和低采伐频率条件下，对提高生物量生产力最有效。需要对来自其他功能组的物种进行实地研究，以得出更一般的结论。

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  • 来源
    《Ecological research》 |2017年第4期|611-619|共9页
  • 作者

    Yin Xin; Qi Wei; Du Guozhen;

  • 作者单位

    Lanzhou Univ, Sch Life Sci, State Key Lab Grassland Agroecosyst, South Tianshui Rd 222, Lanzhou 730000, Gansu, Peoples R China;

    Lanzhou Univ, Sch Life Sci, State Key Lab Grassland Agroecosyst, South Tianshui Rd 222, Lanzhou 730000, Gansu, Peoples R China;

    Lanzhou Univ, Sch Life Sci, State Key Lab Grassland Agroecosyst, South Tianshui Rd 222, Lanzhou 730000, Gansu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aboveground biomass; Complementarity effect; Management practice; Selection effect; Species richness;

    机译：地上生物量互补效应管理实践选择效应物种丰富度;

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