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首页> 美国卫生研究院文献>PLoS Clinical Trials >Climate-driven changes of riparian plant functional types in permanent headwater streams. Implications for stream food webs
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Climate-driven changes of riparian plant functional types in permanent headwater streams. Implications for stream food webs

机译：气候驱动的永久源头河岸植物功能类型的变化。对流式食品网的影响

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Little is known regarding consequences of climate change on riparian plant functional types (PFTs) related to leaf traits, with putative domino effects on stream food webs, plausible even if the tipping point of stream-desiccation is not reached. We hypothesized that, as stream food-webs are highly dependent on riparian subsidies, climate change might alter PFTs to the point of weakening terrestrial-aquatic linkages. We conducted a gradient analysis to assess the relative effects of climate, soil and riparian physical characteristics on PFTs. If PFTs differ significantly in leaf traits and climate had major influences on them, we could assume space-for-time interchangeability forward in time to predict leaf traits changes, and consequences for stream food webs under future climate change scenarios. Results indicated a clear distinction in leaf traits among PFTs: woody deciduous plants showed leaf traits associated to high decomposability and nutritional value for invertebrate shredders compared to evergreen woody and giant graminoid groups. We found a prime role of climate predicting changes in abundance and diversity of PFTs: 1) a warming and precipitation-decline scenario, coupled with soil characteristics related to aridification, would have detrimental effects on deciduous plants, while fostering giant graminoids; 2) in a scenario of no precipitation-reduction in wetter areas, warming might promote the expansion of evergreen to the detriment of deciduous plants. In both scenarios the net outcome implies increasing recalcitrance of leaf litter inputs, potentially weakening terrestrial-aquatic linkages in headwater streams.
机译：关于气候变化对与叶片性状有关的河岸植物功能类型（PFTs）的后果知之甚少，即使对溪流食物网没有达到临界点，对溪流食物网也可能产生多米诺效应。我们假设，由于河流食物网高度依赖河岸补贴，因此气候变化可能会改变PFTs到削弱陆生水生联系的程度。我们进行了梯度分析，以评估气候，土壤和河岸物理特征对PFT的相对影响。如果PFTs在叶片性状上有显着差异并且气候对它们有重大影响，我们可以在时间上假设时空可互换性，以预测叶片性状的变化以及未来气候变化情景下河流食物网的后果。结果表明，PFT之间的叶片性状存在明显区别：与常绿的木质和巨型粒状类相比，木质的落叶植物显示出与无脊椎动物切菜机高分解性和营养价值相关的叶片性状。我们发现气候预测PFT的丰度和多样性变化的主要作用是：1）变暖和降水下降的情景，再加上与干旱化相关的土壤特征，会对落叶植物产生有害影响，同时培育巨大的类粉虱。 2）在湿润地区不减少降水的情况下，变暖可能会促进常绿植物的生长，从而损害落叶植物。在这两种情况下，最终结果都表明增加了对落叶垫料输入的抵制，可能会削弱源头水流中的陆-水联系。

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