Exogenous calcium-induced carbonate formation to increase carbon sequestration in coastal saline-alkali soil,Science of the Total Environment

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Exogenous calcium-induced carbonate formation to increase carbon sequestration in coastal saline-alkali soil
Science of the Total Environment ( IF 8.2 ) Pub Date : 2024-06-27 , DOI: 10.1016/j.scitotenv.2024.174338
Jian Xiang ₁ , Wenzhu Shi ₁ , Zhenjiao Jing ₁ , Yaling Guan ₁ , Fengmin Yang ₁ , Genmei Wang ₁ , Xi Sun ₁ , Jiaxin Li ₁ , Qing Li ₁ , Huanchao Zhang ₁

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Promoting soil carbon sequestration is a possible way to mitigate global warming. To investigate the effects of exogenous calcium on soil carbon sequestration during the application of organic matter to improve coastal saline-alkali soil. In this study, a 30-day incubation experiment was based on the application of corn straw biochar + chicken manure (BM) and rice straw + chicken manure (SM). Usages of exogenous calcium in each treatment under each organic matter combination as follow: CK (No exogenous calcium), CaSi1 (1.24 g CaSiO, i.e. 4.28 g Ca kg soil), CaSi2 (2.48 g CaSiO, i.e. 8.56 g Ca kg soil), CaOH1 (0.79 g Ca(OH), i.e. 4.28 g Ca kg soil), CaOH2 (1.58 g Ca(OH), i.e. 8.56 g Ca kg soil), CaSiOH (1.24 g CaSiO + 0.79 g Ca(OH), i.e. 8.56 g Ca kg soil). Results showed that exogenous calcium significantly reduced CO emission. Organic matter addition promoted the loss of SOC, and exogenous did not significantly affect the mineralization of SOC albeit strongly increased SIC, making up for the loss of SOC, increasing soil total carbon and realizing soil carbon fixation. Soil carbon fixation was mainly realized by the reaction of exogenous calcium with CO generated by mineralization and converting it into calcium carbonate. pH and soil CO emission are the major controlling factors for soil inorganic carbon sequestration. Therefore, applying organic matter with exogenous calcium can realize soil carbon fixation by generation of calcium carbonate.

中文翻译：

外源钙诱导碳酸盐形成增加沿海盐碱土固碳

促进土壤固碳是缓解全球变暖的一种可能方法。探讨施用有机质改良滨海盐碱土过程中外源钙对土壤固碳的影响。本研究采用玉米秸秆生物炭+鸡粪（BM）和稻草+鸡粪（SM）进行30天的孵化实验。各有机质组合下各处理的外源钙用量如下：CK（无外源钙）、CaSi1（1.24 g CaSiO，即 4.28 g Ca·kg 土壤）、CaSi2（2.48 g CaSiO，即 8.56 g Ca·kg 土壤）、 CaOH1（0.79 g Ca(OH)，即 4.28 g Ca·kg 土壤）、CaOH2（1.58 g Ca(OH)，即 8.56 g Ca·kg 土壤）、CaSiOH（1.24 g CaSiO + 0.79 g Ca(OH)，即 8.56 g钙千克土壤）。结果表明，外源钙显着减少了二氧化碳排放。有机质添加促进了SOC的损失，外源虽然强烈增加了SIC，但并未显着影响SOC的矿化，弥补了SOC的损失，增加了土壤全碳，实现了土壤固碳。土壤固碳主要是通过外源钙与矿化产生的CO发生反应，转化为碳酸钙来实现。 pH值和土壤CO排放是土壤无机碳固存的主要控制因素。因此，施用有机质和外源钙可以通过生成碳酸钙来实现土壤固碳。

更新日期：2024-06-27

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