State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China.
Glob Chang Biol. 2023 Dec;29(24):7102-7116. doi: 10.1111/gcb.16986. Epub 2023 Oct 14.
Global warming has significantly affected terrestrial ecosystems. Biomass and C:N:P stoichiometry of plants and soil is crucial for enhancing plant productivity, improving human nutrition, and regulating biogeochemical cycles. However, the effect of warming on the biomass and C:N:P stoichiometry of different components (plant, leaf, stem, root, litter, soil, and microbial biomass) in various terrestrial ecosystems remains uncertain. We conducted a comprehensive meta-analysis to investigate the global patterns of biomass and C:N:P stoichiometry responses to warming, as well as interaction relationships based on 1399 paired observations from 105 warming studies. Results indicated that warming had a significant impact on various aspects of plant growth, including an increase in plant biomass (+16.55%), plant C:N ratio (+4.15%), leaf biomass (+16.78%), stem biomass (+23.65%), root biomass (+22.00%), litter C:N ratio (+9.54%) and soil C:N ratio (+5.64%). However, it also decreased stem C:P ratio (-23.34%), root C:P ratio (-12.88%), soil N:P ratio (-14.43%) and soil C:P ratio (-16.33%). The magnitude of warming was the primary drivers of changes of biomass and C:N:P stoichiometry. By establishing the general response curves of changes in biomass and C:N:P ratios with increasing temperature, we demonstrated that warming effect on plant, root, and litter biomass shifted from negative to positive, whereas that on leaf and stem biomass changed from positive to negative as temperature increased. Additionally, the effect of warming on root C:N ratio, root biomass, and microbial biomass N:P ratios shifted from positive to negative, whereas the effects on plant N:P, leaf N:P, leaf C:P, root N:P ratios, and microbial biomass C:N ratio changed from negative to positive with increasing temperature. Our research can help assess plant productivity and optimize ecosystem stoichiometry precisely in the context of global warming.
全球变暖对陆地生态系统产生了重大影响。植物和土壤的生物量和 C:N:P 化学计量学对于提高植物生产力、改善人类营养和调节生物地球化学循环至关重要。然而，变暖对不同成分（植物、叶片、茎、根、凋落物、土壤和微生物生物量）在各种陆地生态系统中的生物量和 C:N:P 化学计量的影响仍不确定。我们进行了一项综合的荟萃分析，以研究全球变暖对生物量和 C:N:P 化学计量的响应模式，以及基于 105 项变暖研究的 1399 对观测值的相互关系。结果表明，变暖对植物生长的各个方面都有显著影响，包括植物生物量增加（+16.55%）、植物 C:N 比增加（+4.15%）、叶片生物量增加（+16.78%）、茎生物量增加（+23.65%）、根生物量增加（+22.00%）、凋落物 C:N 比增加（+9.54%）和土壤 C:N 比增加（+5.64%）。然而，它也降低了茎 C:P 比（-23.34%）、根 C:P 比（-12.88%）、土壤 N:P 比（-14.43%）和土壤 C:P 比（-16.33%）。变暖幅度是生物量和 C:N:P 化学计量变化的主要驱动因素。通过建立生物量和 C:N:P 比随温度升高的一般响应曲线，我们表明，随着温度升高，变暖对植物、根和凋落物生物量的影响从负变正，而对叶片和茎生物量的影响从正变负。此外，变暖对根 C:N 比、根生物量和微生物生物量 N:P 比的影响从正变负，而对植物 N:P、叶片 N:P、叶片 C:P、根 N:P 比和微生物生物量 C:N 比的影响从负变正。我们的研究有助于在全球变暖背景下精确评估植物生产力和优化生态系统化学计量。
