覆盖作物通过增强微聚合物保护和矿物相关碳来促进土壤碳捕获
Shaoqing Zhu1, Upendra M Sainju2, Shaohong Zhang3
1Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Science, Northwest University, Xi'an 710127, China; Shaanxi Key Laboratory for Carbon Neutral Technology, Northwest University, Xi'an 710127, China.
The Science of the total environment
|November 6, 2023
概括
覆盖作物通过改善土壤聚合和增加受保护的碳分数来增强土壤碳封存. 大豆和南草混合物在促进土壤碳储存和稳定性方面最有效.
科学领域:
- 土壤科学 土壤科学
- 农业学是一种农业学.
- 生态生态学 生态生态学
背景情况:
- 覆盖作物被认为可以增强土壤碳捕获.
- 土壤聚合物和覆盖作物下的矿物质中碳 (C) 捕获的具体机制需要进一步研究.
- 了解这些机制对于优化气候变化缓解的农业实践至关重要.
研究的目的:
- 探索不同土壤聚合物和矿物分量的土壤C封存机制,在各种覆盖作物策略下.
- 量化不同覆盖作物 (大豆,南草和混合物) 在五年内对土壤聚合和C分量的影响.
- 为了比较覆盖作物与没有覆盖作物的有效性,改善土壤C稳定性.
主要方法:
- 进行了一项为期五年的实地实验,使用夏季覆盖作物和冬季小麦旋转系统.
- 建立了三个覆盖作物处理方法 (大豆,南草,大豆-南草混合物) 和一个没有覆盖作物的控制.
- 分析了土壤样本的C分量,包括粗颗粒有机C (cPOC),微聚合物内部细颗粒有机C (iPOC),自由细颗粒有机C (fPOC) 和矿物相关有机C (MOC),在不同的土壤深度和聚合物大小.
主要成果:
- 覆盖作物显著增加了大型宏积体的比例和土壤聚合物的平均重量直径 (MWD),特别是在大豆和草混合物中.
- 与对照组相比,覆盖作物通常增加了MOC,iPOC和fPOC分量,大豆-草混合物显示最大的增加.
- 矿物相关有机碳 (MOC) 是所有处理和深度中最大的受保护碳分数.
结论:
- 覆盖作物增强土壤聚合,并通过增加受保护的C分数,特别是受微聚合物保护的 (iPOC) 和矿物相关的C (MOC) 来促进C封存.
- 这些受保护的C分量的增加导致土壤C稳定性得到改善,与没有覆盖作物的传统做法相比.
- 覆盖作物的混合物,特别是大豆和南草,在促进土壤聚合物稳定性和增强土壤C分量方面表现出卓越的有效性.
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