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Severe freezing increases soil respiration during the thawing period: A meta-analysis
European Journal of Soil Science ( IF 4.2 ) Pub Date : 2021-08-23 , DOI: 10.1111/ejss.13161
Jianxin Zhang 1, 2 , Jiangtao Hong 1 , Da Wei 1 , Wang Xiaodan 1
Affiliation  

It is unclear how changes in soil freeze–thaw processes initiated by climate change might alter soil respiration. Using meta-analysis, we quantified the thawing effect on soil respiration under different freezing intensities and explored possible relationships among effect sizes with environmental factors. Our results showed that the overall mean thawing effect size was 18.84% and was highly variable among different ecosystems. Mild soil freezing (≥−5°C) did not produce a significant thawing effect, while severe soil freezing (<−5°C) consistently increased soil respiration during the subsequent thawing period across a diverse range of terrestrial ecosystems. Thawing effect sizes were significantly positively correlated with soil pH and freezing duration, but negatively correlated with soil C/N ratios, suggesting that soil respiration during thawing periods are stimulated more by freeze–thawing events under conditions of higher soil pH, longer freezing periods or lower soil C/N ratios. Consequently, this study reveals the important role of antecedent soil freezing temperatures in triggering the thawing effect and furthers our understanding of climatic interactions with soil carbon dynamics.

中文翻译:

解冻期间严重冻结会增加土壤呼吸:荟萃分析

目前尚不清楚气候变化引发的土壤冻融过程的变化如何改变土壤呼吸。通过荟萃分析,我们量化了不同冻结强度下解冻对土壤呼吸的影响,并探讨了影响大小与环境因素之间可能存在的关系。我们的结果表明,总体平均解冻效应大小为 18.84%,并且在不同生态系统之间存在很大差异。轻度土壤冻结(≥-5°C)不会产生显着的解冻效果,而严重的土壤冻结(<-5°C)在随后的解冻期间持续增加各种陆地生态系统的土壤呼吸。解冻效应大小与土壤 pH 值和冻结持续时间呈显着正相关,但与土壤 C/N 比呈负相关,表明在较高的土壤 pH 值、较长的冻结期或较低的土壤 C/N 比条件下,冻融事件更多地刺激了解冻期间的土壤呼吸。因此,本研究揭示了前期土壤冻结温度在触发解冻效应中的重要作用,并加深了我们对气候与土壤碳动力学相互作用的理解。
更新日期:2021-08-23
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