Increased interactions between iron oxides and organic carbon under acid deposition drive large increases in soil organic carbon in a tropical forest in southern China
Increased interactions between iron oxides and organic carbon under acid deposition drive large increases in soil organic carbon in a tropical forest in southern China
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酸沉降作用下铁氧化物与有机碳之间相互作用的增强导致中国南方热带森林土壤有机碳大幅增加
DOI：
10.1007/s10533-022-00897-w
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发表时间：
2022-02
期刊：
影响因子：
4
通讯作者：
Deng Qi
中科院分区：
文献类型：
--
作者：
Chen Jingwen;Hu Yuanliu;Hall Steven J.;Hui Dafeng;Li Jianling;Chen Guoyin;Sun Lianwei;Zhang Deqiang;Deng Qi
大气酸沉降是一个普遍存在的问题，它可能通过改变有机-无机相互作用而影响土壤中碳的保护。然而，在天然酸性热带土壤中，活性铁（Fe）相含量高，额外的酸度对有机-无机相互作用和土壤固碳的影响还没有得到很好的研究。在这里，我们进行了一个长期（9.5年）的田间试验，采用不同酸度梯度处理（3，9.6，32，96 mol H+ha− 1 year −1as硝酸+硫酸，添加到环境沉积物中），以研究酸化如何改变中国热带森林中的有机-无机相互作用和土壤有机碳（SOC）库，其中土壤已经是高度酸性的（pH = 4）。正如预期的那样，土壤酸化显著增强了盐基阳离子的淋溶（例如，Ca ~（2+）的存在，并改变了Fe和Al相的溶解度和组成。酸度处理降低总铁和转换更多的结晶铁（oxyhydr）氧化物的短程有序相，证明由柠檬酸盐-抗坏血酸溶液和0.5 M盐酸提取的铁的增加，并减少在柠檬酸盐-连二亚硫酸盐和柠檬酸盐-抗坏血酸提取的铁的差异。总之，这些变化导致Fe结合的C大幅增加，而Ca结合的C相对较小地减少。总体而言，酸性处理将矿物相关的C储量增加到32.5-36.4 Mg C ha− 1，而对照组为28.8 Mg C ha− 1，占观察到的总SOC储量增加的71-83%。这些研究结果突出了pH敏感的地球化学变化的重要性和铁在调节SOC的响应，以进一步输入的酸沉降，即使在高度风化和天然酸性土壤的关键作用。这里观察到的SOC变化幅度进一步揭示了在地球系统模型中包括pH敏感的地球化学的必要性，以更好地预测未来酸沉降情景下的生态系统C预算。
Atmospheric acid deposition remains a widespread problem that may influence the protection of carbon (C) in soil by altering organo-mineral interactions. However, the impacts of additional acidity on organo-mineral interactions and soil C sequestration in naturally acidic tropical soils with a high content of reactive iron (Fe) phases have not been well studied. Here we conducted a long-term (9.5-year) field experiment with a gradient of acidity treatments (3, 9.6, 32, 96 mol H+ha−1year−1as nitric + sulfuric acid, added to ambient deposition) to examine how acidification alters organo-mineral interactions and soil organic carbon (SOC) pools in a tropical forest of China where soils are already highly acidic (pH ≈ 4). As expected, soil acidification significantly enhanced the leaching of base cations (e.g., Ca2+), and it also altered the solubility and composition of Fe and Al phases. The acidity treatments decreased total Fe and converted more crystalline Fe (oxyhydr) oxides to short-range-ordered phases, evidenced by an increase in Fe extracted by citrate-ascorbate solution and 0.5 M hydrochloric acid, and a decrease in the difference in Fe extracted by citrate-dithionite and citrate-ascorbate. Together, these changes led to a large increase in Fe-bound C versus a relatively small decrease in Ca-bound C. Overall, the acidity treatments increased the mineral-associated C stock to 32.5–36.4 Mg C ha−1versus 28.8 Mg C ha−1in the control, accounting for 71–83% of the observed increase in total SOC stock. These findings highlight the importance of pH-sensitive geochemical changes and the key roles of Fe in regulating the response of SOC to further inputs of acid deposition even in highly weathered and naturally acidic soils. The magnitude of SOC changes observed here further reveals the necessity of including pH-sensitive geochemistry in Earth system models to better predict ecosystem C budgets under future acid deposition scenarios.
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影响因子：
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作者：
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影响因子：
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