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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Study type and plant litter identity modulating the response of litter decomposition to warming, elevated CO_2, and elevated O_3: A meta-analysis
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Study type and plant litter identity modulating the response of litter decomposition to warming, elevated CO_2, and elevated O_3: A meta-analysis

机译：研究类型和植物凋落物特性调节凋落物分解对变暖，CO_2和O_3升高的响应：一项荟萃分析

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摘要

Plant litter decomposition is one of the most important ecosystem carbon flux processes in terrestrial ecosystems and is usually regarded as sensitive to climate change. The goal of the present study was to examine the effects of changing climate variables on litter decomposition. By synthesizing data from multiple terrestrial ecosystems, we quantified the response of the litter decomposition rate to the independent effects of warming, elevated carbon dioxide (CO_2), elevated ozone (O_3), and the combined effects of elevated CO_2 +elevated O_3. Across all case studies, warming increased the litter decomposition rate significantly by 4.4%, but this effect could be reduced as a result of the negatively significant effects of elevated CO_2 and elevated CO_2+elevated O_3. The combined effects of elevated CO_2 +elevated O_3 decreased the litter decomposition rate significantly, and the magnitude appeared to be higher than that of the elevated CO_2 per se. Moreover, the study type (field versus laboratory), ecosystem type, and plant litter identity and functional traits (growth form and litter form) were all important moderators regulating the response of litter decomposition to climate warming and elevated CO_2 and O_3. Although litter decomposition rate may show a moderate change as a result of the effects of multiple changing climate variables, the process of litter decomposition would be strongly altered due to the differing mechanisms of the effects of each climate change variable, suggesting that the global carbon cycle and biogeochemistry could be substantially affected.
机译：植物凋落物分解是陆地生态系统中最重要的生态系统碳通量过程之一，通常被认为对气候变化敏感。本研究的目的是研究气候变量的变化对垃圾分解的影响。通过综合来自多个陆地生态系统的数据，我们量化了凋落物分解速率对变暖，二氧化碳升高（CO_2），臭氧升高（O_3）和二氧化碳升高CO_2 +升高O_3的综合影响的响应。在所有案例研究中，气候变暖使垫料分解率显着提高了4.4％，但由于CO_2升高和CO_2 + O_3升高带来的负面影响，这种影响可能会降低。升高的CO_2 +升高的O_3的综合作用显着降低了凋落物的分解速率，其幅度似乎高于升高的CO_2本身。此外，研究类型（田间对比实验室），生态系统类型，植物凋落物特性和功能性状（生长形式和凋落物形式）都是调节凋落物分解对气候变暖和CO_2和O_3升高响应的重要调节剂。尽管由于多种气候变量的影响，凋落物分解速率可能会显示出适度的变化，但由于每个气候变化变量的作用机理不同，凋落物分解的过程也会发生很大变化，这表明全球碳循环生物地球化学可能会受到重大影响。

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