Consideration of dissolved organic carbon flux reduces estimated wetland carbon losses in response to warming
Consideration of dissolved organic carbon flux reduces estimated wetland carbon losses in response to warming
复制标题
考虑溶解有机碳通量可减少估计的湿地因变暖而造成的碳损失
DOI：
10.1007/s11368-020-02767-0
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发表时间：
2020-09
影响因子：
3.6
通讯作者：
Ming Nie
中科院分区：
文献类型：
--
作者：
Hongyang Chen;Changming Fang;Ming Nie
目的湿地气态碳(C)排放已被广泛用于评价土壤有机碳(SOC)分解的温度敏感性(Q10)。然而，作为土壤固相有机碳流失的一个重要途径的溶解有机碳(DOC)通量在这类估算中很少被考虑，这可能会给湿地土壤C-气候反馈的预测带来偏差。因此，本研究旨在探讨湿地土壤有机碳分解的温度敏感性是否以及如何受到DOC通量的影响。材料与方法利用不同湿地土壤进行厌氧微宇宙实验，评估湿地土壤有机碳分解对温度变化的反馈作用。结果和讨论低温下有机碳通量对湿地有机碳分解的贡献显著高于高温(p<；0.05)。然而，对于低SOC湿地土壤，这种高估并不显著(p>；0.05)。此外，碱性湿地土壤的高估程度远高于酸性湿地土壤，在所有湿地土壤样品中，Q10(气态碳排放)与Q10(有机碳分解)的比值与土壤pH呈显著正相关(p<；0.01)。结论我们的研究结果表明，如果不考虑DOC通量，湿地有机碳分解对温度变化的敏感性可能被高估了，尤其是在碱性或高有机碳土壤中。因此，在预测湿地碳损失对气候变暖的响应时，C气候模型应考虑DOC通量。
PurposeWetland gaseous carbon (C) emissions have been widely used to evaluate temperature sensitivity of soil organic carbon (SOC) decomposition (indicated byQ10). However, dissolved organic carbon (DOC) flux as an important pathway for soil solid-phase organic carbon losses has seldom been considered in such estimations, which may introduce bias in predictions of wetland soil C-climate feedback. Hence, this study aimed to explore whether and how the temperature sensitivity of wetland SOC decomposition is affected by DOC flux.Materials and methodsWe carried out an anaerobic microcosm experiment using diverse wetland soils to assess the feedback of wetland SOC decomposition to temperature change with and without considering DOC flux.Results and discussionThe contribution of DOC flux to wetlands SOC decomposition at a low temperature was significantly (p< 0.05) higher than that at a high temperature.Q10values of wetland SOC decomposition rates were significantly (p< 0.05) overestimated, by an average of 8%, when DOC was not considered. However, this overestimation was not significant (p> 0.05) for low-SOC wetland soils. In addition, the overestimation for alkaline wetland soils was much higher than that of acid wetland soils, with a significantly (p< 0.01) positive correlation between the ratios ofQ10(gaseous C emissions) toQ10(SOC decomposition) and soil pH across all wetland soil samples.ConclusionsOur finding suggested that the sensitivity of wetland SOC decomposition to temperature change might be overestimated if DOC flux is not considered, especially in alkaline or high-SOC soils. Thus, C-climate models should incorporate DOC flux when predicting wetland C loss in response to warming.
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影响因子：
9.7
作者：
Fabien Leroy;S. Gogo;C. Guimbaud;Léonard Bernard-Jannin;Zhen Hu;F. Laggoun‐Défarge
通讯作者：
Fabien Leroy;S. Gogo;C. Guimbaud;Léonard Bernard-Jannin;Zhen Hu;F. Laggoun‐Défarge
影响因子：
11.6
作者：
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通讯作者：
Helfter, Carole
影响因子：
1.1
作者：
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通讯作者：
Matthieu Crews;D. Bhugra
影响因子：
8.8
作者：
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通讯作者：
L. Thibodeaux;L. Aguilar
影响因子：
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作者：
C. Aring;T. Spies
通讯作者：
C. Aring;T. Spies