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气候变暖加速叶片凋落物的碳释放——一项全球综合研究。

Climate warming accelerates carbon release from foliar litter-A global synthesis.

机构信息

Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou, China.

Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, China.

出版信息

Glob Chang Biol. 2024 May;30(5):e17350. doi: 10.1111/gcb.17350.

Abstract

With over one-third of terrestrial net primary productivity transferring to the litter layer annually, the carbon release from litter serves as a crucial valve in atmospheric carbon dioxide concentrations. However, few quantitative global projections of litter carbon release rate in response to climate change exist. Here, we combined a global foliar litter carbon release dataset (8973 samples) to generate spatially explicitly estimates of the response of their residence time (τ) to climate change. Results show a global mean litter carbon release rate ( ) of 0.69 year (ranging from 0.09-5.6 year). Under future climate scenarios, global mean τ is projected to decrease by a mean of 2.7% (SSP 1-2.6) and 5.9% (SSP 5-8.5) during 2071-2100 period. Locally, the alleviation of temperature and moisture restrictions corresponded to obvious decreases in τ in cold and arid regions, respectively. In contract, τ in tropical humid broadleaf forests increased by 4.6% under SSP 5-8.5. Our findings highlight the vegetation type as a powerful proxy for explaining global patterns in foliar litter carbon release rates and the role of climate conditions in predicting responses of carbon release to climate change. Our observation-based estimates could refine carbon cycle parameterization, improving projections of carbon cycle-climate feedbacks.

摘要

每年有超过三分之一的陆地净初级生产力转移到凋落物层,凋落物中的碳释放是大气二氧化碳浓度的一个关键阀门。然而,很少有关于气候变化下凋落物碳释放率的全球定量预测。在这里,我们结合了全球叶片凋落物碳释放数据集(8973 个样本),生成了对其停留时间(τ)对气候变化响应的空间明确估计。结果表明,全球平均凋落物碳释放率( )为 0.69 年(范围为 0.09-5.6 年)。在未来气候情景下,预计全球平均 τ 在 2071-2100 年期间将分别减少 2.7%(SSP1-2.6)和 5.9%(SSP5-8.5)。在局部地区,温度和水分限制的缓解分别导致寒冷和干旱地区 τ 的明显下降。相比之下,在 SSP5-8.5 下,热带湿润阔叶林的 τ 增加了 4.6%。我们的研究结果强调了植被类型作为解释叶片凋落物碳释放率全球格局的有力指标,以及气候条件在预测碳释放对气候变化的响应中的作用。我们基于观测的估计可以改进碳循环参数化,从而提高碳循环-气候反馈的预测。

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