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Mechanisms of cover crop-derived carbon sequestration in winter wheat fields: Insights from 13C labeling
Soil and Tillage Research ( IF 6.1 ) Pub Date : 2025-01-24 , DOI: 10.1016/j.still.2025.106462
Rui Liu, Upendra M. Sainju, Rajan Ghimire, Hongyan Cheng, Fangyuan Guan, Yang Liu, Caidi Yang, Fazhu Zhao, Jun Wang
Soil and Tillage Research ( IF 6.1 ) Pub Date : 2025-01-24 , DOI: 10.1016/j.still.2025.106462
Rui Liu, Upendra M. Sainju, Rajan Ghimire, Hongyan Cheng, Fangyuan Guan, Yang Liu, Caidi Yang, Fazhu Zhao, Jun Wang
Cover cropping is an effective agricultural management strategy for enhancing soil organic carbon (SOC) sequestration and mitigating climate change. However, the contribution of different cover crop species to individual carbon (C) fractions in soil remains unclear. An in-situ decomposition experiment using 13 C-labeled residues of soybean (SB) or sudangrass (SG), along with a control with no residue (CK), was designed to explore the dynamics of residue decomposition, distribution of cover crop-derived C into aggregate-protected and -unprotected C, and the sequestration mechanisms of these fractions. The aggregate-protected C included intra-aggregate particulate organic C (iPOC) and mineral-associated organic C (MAOC), and aggregate-unprotected C included coarse particulate organic C (cPOC) and free fine particulate organic C (fPOC). The amount and rate of cover crop residue C mineralization were greater in SB than in SG across all wheat-growing stages. The SB increased large macroaggregate (>2 mm) compared to SG during the early wheat growth stages. The aggregate-protected C fractions were greater in SB and SG than CK at the pre-sowing, tillering, and heading stages. The 13 C labeling indicated that C sequestration occurred primarily as aggregate-protected C, predominantly as MAOC. The recovery efficiencies of cover crop-derived C into soil C fractions fell below 0 % at green-up and jointing stages. At maturity stage, the cumulative C recovery rate of cover crop-derived C into SOC was greater in SB (16.3 %) than in SG (8.76 %). Correlation analysis indicated that cover cropping promoted SOC sequestration primarily and directly by increasing the aggregate-protected C. Structural equation model analysis suggested that SG sequestered C into soils primarily by increasing cPOC and iPOC, In contrast, SB sequestered C by increasing cPOC, iPOC, and MAOC. This study elucidates the dynamic effects of cover cropping on soil C during wheat growth and the distinct C sequestration mechanisms in legume and non-legume systems.
中文翻译:
冬小麦田覆盖作物衍生的碳封存机制:来自 13C 标记的见解
覆盖作物是增强土壤有机碳 (SOC) 封存和缓解气候变化的有效农业管理策略。然而,不同覆盖作物物种对土壤中单个碳 (C) 组分的贡献仍不清楚。使用大豆 (SB) 或苏丹草 (SG) 的 13 C 标记残基以及无残基对照 (CK) 的原位分解实验,旨在探索残基分解的动力学,覆盖作物衍生的 C 向聚集体保护和未保护的 C 的分布,以及这些组分的封存机制。聚集体保护的 C 包括聚集体内颗粒有机物 C (iPOC) 和矿物相关有机物 C (MAOC),聚集体未保护的 C 包括粗颗粒有机物 C (cPOC) 和游离细颗粒有机物 C (fPOC)。在所有小麦生长阶段,SB 中覆盖作物残留物 C 矿化的数量和速率都大于 SG。在小麦生长早期,与 SG 相比,SB 增加了大大团聚体 (>2 mm)。在播种前、分蘖和抽穗期,SB 和 SG 中受聚集体保护的 C 组分大于 CK。13C 标记表明 C 封存主要以聚集体保护的 C 形式发生,以 MAOC 为主。覆盖作物衍生的 C 在土壤 C 组分中的回收效率在绿化和拔节阶段降至 0 % 以下。在成熟期,SB (16.3 %) 的覆盖作物衍生 C 转化为 SOC 的累积碳回收率高于 SG (8.76 %)。相关性分析表明,覆盖作物主要通过增加聚集体保护的 C 直接促进 SOC 封存。 结构方程模型分析表明,SG 主要通过增加 cPOC 和 iPOC 将 C 隔离到土壤中,相比之下,SB 通过增加 cPOC 、 iPOC 和 MAOC 来隔离 C。本研究阐明了小麦生长过程中覆盖作物对土壤 C 的动态影响,以及豆科和非豆科植物系统中独特的 C 封存机制。
更新日期:2025-01-24
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
冬小麦田覆盖作物衍生的碳封存机制:来自 13C 标记的见解
覆盖作物是增强土壤有机碳 (SOC) 封存和缓解气候变化的有效农业管理策略。然而,不同覆盖作物物种对土壤中单个碳 (C) 组分的贡献仍不清楚。使用大豆 (SB) 或苏丹草 (SG) 的 13 C 标记残基以及无残基对照 (CK) 的原位分解实验,旨在探索残基分解的动力学,覆盖作物衍生的 C 向聚集体保护和未保护的 C 的分布,以及这些组分的封存机制。聚集体保护的 C 包括聚集体内颗粒有机物 C (iPOC) 和矿物相关有机物 C (MAOC),聚集体未保护的 C 包括粗颗粒有机物 C (cPOC) 和游离细颗粒有机物 C (fPOC)。在所有小麦生长阶段,SB 中覆盖作物残留物 C 矿化的数量和速率都大于 SG。在小麦生长早期,与 SG 相比,SB 增加了大大团聚体 (>2 mm)。在播种前、分蘖和抽穗期,SB 和 SG 中受聚集体保护的 C 组分大于 CK。13C 标记表明 C 封存主要以聚集体保护的 C 形式发生,以 MAOC 为主。覆盖作物衍生的 C 在土壤 C 组分中的回收效率在绿化和拔节阶段降至 0 % 以下。在成熟期,SB (16.3 %) 的覆盖作物衍生 C 转化为 SOC 的累积碳回收率高于 SG (8.76 %)。相关性分析表明,覆盖作物主要通过增加聚集体保护的 C 直接促进 SOC 封存。 结构方程模型分析表明,SG 主要通过增加 cPOC 和 iPOC 将 C 隔离到土壤中,相比之下,SB 通过增加 cPOC 、 iPOC 和 MAOC 来隔离 C。本研究阐明了小麦生长过程中覆盖作物对土壤 C 的动态影响,以及豆科和非豆科植物系统中独特的 C 封存机制。