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土壤呼吸长期变暖的土壤呼吸反应在亚北极草原的季节性变化

Fabrizzio Protti-Sánchez¹, Linsey M Avila², Kathiravan Meeran³

¹Department of Ecology, Universität Innsbruck, Innsbruck, Austria.

Global change biology

|August 1, 2025

概括

北方土壤的变暖显著提高了寒冷季节的土壤呼吸 (SR),每年每摄氏度增加5.8%的二氧化碳排放量. 由于土壤碳耗尽和适应,夏季气候变暖对SR的影响很小.

科学领域:

生态生态学生态生态学
生物地质化学生物地质化学
气候变化科学气候变化科学

背景情况:

北方生态系统面临着快速变暖,影响土壤碳 (C) 动态.
土壤呼吸 (SR) 对变暖反应的季节性变化仍然不太清楚,特别是在漫长的寒冷季节.

研究的目的:

研究土壤变暖对亚北极草原全年土壤呼吸 (SR) 的长期影响.
为了确定变暖对SR的影响是否持续季节性或全年变化.

主要方法:

利用自然的地热梯度,在10多年内应用持续的土壤变暖 (+0°C至+10°C).
用高分辨率测量全年土壤二氧化碳流量.
采用稳定同位素分析来区分地热和生物CO2来源.

主要成果:

土壤变暖在寒冷季节 (10月至5月) 显著增加了SR,但在夏季 (7月至9月) 没有显著影响.
每年SR每摄氏度升温增加5.8%,主要是由于寒冷季节呼吸能力增强.
长期变暖导致SR的温度灵敏度 (Q10) 和季节幅度下降,表明了热适应.

结论:

土壤变暖改变了北方生态系统的季节性C流动力学,增强了寒冷季节对年度SR的贡献.
在气候变化下准确预测土壤碳动态需要考虑SR的季节性.
土壤微生物和植物根的适应,以及土壤C的枯竭,可能解释了夏季变暖反应的缺乏.

关键词:

北方的草原是北方的草原.季节性的季节性.土壤二氧化碳排放流出土壤变暖土壤变暖温度灵敏度是指温度的灵敏度.热适应热适应热适应

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