Abstract：
Plants, soils and microorganisms play important roles in maintaining stable terrestrial stoichiometry. Studying how nutrient balances of these biotic and abiotic players vary across temperature gradients is important when predicting ecosystem changes on a warming planet. The respective responses of plant, soil and microbial stoichiometric ratios to warming have been observed, however, whether and how the stoichiometric correlations among the three components shift under warming has not been clearly understood and identified. In the present study, we have performed a meta-analysis based on 600 case studies from 74 sites or locations to clarify whether and how warming affects plant, soil and microbial stoichiometry, respectively, and their correlations. Our results indicated that: (1) globally, plants had higher C:N and C:P values compared to soil and microbial pools, but their N:P distributions were similar; (2) warming did not significantly alter plant, soil and microbial C:N and C:P values, but had a noticeable effect on plant N:P ratios. When ecosystem types, duration and magnitude of warming were taken into account, there was an inconsistent and even inverse warming response in terms of the direction and magnitude of changes in the C:N:P ratios occurring among plants, soils and microorganisms; (3) despite various warming responses of the stoichiometric ratios detected separately for plants, soils and microorganisms, the stoichiometric correlations among all three parts remained constant even under different warming scenarios. Our study highlighted the complexity of the effect of warming on the C:N:P stoichiometry, as well as the absence and importance of simultaneous measurements of stoichiometric ratios across different components of terrestrial ecosystems, which should be urgently strengthened in future studies.
摘要：
植物,土壤和微生物在维持陆地化学计量稳定中起着重要作用。在预测变暖星球上的生态系统变化时，研究这些生物和非生物参与者的营养平衡如何在温度梯度上变化是很重要的。植物各自的反应，已经观察到土壤和微生物化学计量比与变暖的关系，然而,在变暖的情况下，这三个成分之间的化学计量相关性是否以及如何变化还没有被清楚地理解和确定。在本研究中,我们基于来自74个地点或地点的600个案例研究进行了荟萃分析，以阐明变暖是否以及如何影响植物，土壤和微生物化学计量，分别,以及它们的相关性。我们的结果表明：(1)在全球范围内，与土壤和微生物池相比，植物具有更高的C：N和C：P值，但它们的氮磷分布相似；(2)变暖没有显著改变植物，土壤和微生物C：N和C：P值，但对植物氮磷比有显著影响。当生态系统类型时，考虑了变暖的持续时间和幅度，就植物之间C：N：P比变化的方向和幅度而言，存在不一致甚至相反的变暖响应，土壤和微生物；（3）尽管植物分别检测到化学计量比的各种变暖响应，土壤和微生物，即使在不同的变暖情景下，所有三个部分之间的化学计量相关性也保持不变。我们的研究强调了变暖对C：N：P化学计量的影响的复杂性，以及同时测量陆地生态系统不同组成部分的化学计量比的缺乏和重要性，在未来的研究中应该紧急加强。
