Rice Straw Biochar is More Beneficial to Soil Organic Carbon Accumulation and Stabilization than Rice Straw and Rice Straw Ash

文献类型： 外文期刊

第一作者： He, Mengru

作者： He, Mengru;Jiang, Ya;Han, Yuhang;Zhu, Wenhao;Meng, Da;Li, Cuilan;Zhang, Jinjing;Cai, Hongguang

作者机构：

关键词： Soil organic carbon fractions; Soil aggregate-size classes; Soil particle-size classes; Rice straw biochar; C-13 nuclear magnetic resonance spectroscopy

期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.9； 五年影响因子：3.9 ）

ISSN： 0718-9508

年卷期： 2023 年

页码：

收录情况： SCI

摘要： PurposeIt is not well known how crop residue incorporation modes influence soil carbon (C) accumulation and stabilization. Here, an incubation experiment was performed to explore the influences of rice straw (RS) and its ash (RSA) and biochar (RSB) on the concentrations of soil organic carbon (SOC) and SOC fractions associated with bulk soil and its aggregate- and particle-size classes. Moreover, the variation in SOC chemical composition in bulk soil was examined.MethodsSoil samples with RS, RSA, and RSB incorporation and a control without incorporation (CK) were incubated under water logging conditions for 180 d. RSA and RSB were incorporated at a rate equivalent to an RS biomass of 50 g kg(-1) soil. SOC chemical composition was determined by carbon-13 nuclear magnetic resonance spectroscopy.ResultsThe concentrations of SOC and SOC fractions generally increased following the order CK < RSA < RS < RSB. Compared with other treatments, RSB incorporation significantly decreased alkyl C and oxygen-alkyl C concentrations and aliphatic C/aromatic C ratio while significantly increased aromatic C concentration and alkyl C/oxygen-alkyl C and hydrophobic C/hydrophilic C ratios. The SOC and SOC fractions concentrations were positively correlated with each other as well as with aromatic carbon.ConclusionsRSB incorporation is more beneficial for SOC accumulation and stability. Physical protection in macroaggregates, chemical protection by clay, and biochemical protection through aromatic C are considered as the most important mechanisms for SOC preservation. This study provides a theoretical basis for rational utilization of RS in terms of improving soil carbon sequestration.

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