Purpose

Exploring how organic amendments influence carbon sequestration by affecting particulate organic carbon (POC) and determining the optimum amendment for protecting and restoring mollisol and increasing yields.

Methods

Differences of POC properties and maize yields in 3-year soils amended with organic material of different origins were studied. POC was separated by a wet sieving method, and the structure was analyzed by ¹³C NMR spectroscopy.

Results

We found that SOC accumulation in soils amended with plant origin organic materials resulted from increasing organic fractions other than POC, while that in soils amended with animal origin materials resulted from increasing POC. The proportion of POC net variation in SOC net variation was significantly negatively correlated with SOC (p < 0.01). POC, mainly composed of alkyl C and alkoxyl C (more than 68%), had its stability more accurately evaluated through combined analysis of the carbonyl C content and alkyl C/alkoxyl C ratio. The addition of organic materials improved POC stability by increasing the alkyl C/alkoxyl C ratio and decreasing the carbonyl C content. Maize yields were positively correlated with SOC content and POC stability (p < 0.01), which increased by at least 2012 kg ha⁻¹ with the addition of organic materials.

Conclusion

Increasing more stable POC will promote the carbon sink. The order of the stability of POC in mollisol amended with organic materials of different origins was woody plant material > herb material > livestock dung > poultry dung. The woody plant material was the optimum organic amendment for mollisol, enhanced POC stability, and promoted SOC sequestration while increasing the yield.

中文翻译：

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固碳和产量都与受软土中有机改良剂来源影响的颗粒有机碳稳定性有关

目的

探索有机改良剂如何通过影响颗粒有机碳 (POC) 来影响碳固存，并确定用于保护和恢复软质溶胶和提高产量的最佳改良剂。

方法

研究了不同来源有机物质改良后 3 年土壤中 POC 特性和玉米产量的差异。通过湿筛法分离POC，并通过¹³ C NMR光谱分析其结构。

结果

我们发现用植物源有机材料修饰的土壤中的 SOC 积累是由于 POC 以外的有机成分增加所致，而在用动物源材料修饰的土壤中 SOC 积累是由于 POC 增加所致。POC 净变化在 SOC 净变化中的比例与 SOC 显着负相关（p < 0.01）。POC主要由烷基C和烷氧基C组成（68%以上），通过羰基C含量和烷基C/烷氧基C比值的组合分析，更准确地评估了其稳定性。有机材料的添加通过增加烷基 C/烷氧基 C 比率和降低羰基 C 含量来改善 POC 稳定性。玉米产量与 SOC 含量和 POC 稳定性呈正相关（p< 0.01)，添加有机材料至少增加了 2012 kg ha ^-1。

结论

增加更稳定的 POC 将促进碳汇。POC在不同来源有机物修饰的软质溶胶中的稳定性顺序为木本植物材料>药草材料>畜禽粪便>家禽粪便。木本植物材料是 mollisol 的最佳有机改良剂，增强了 POC 稳定性，在提高产量的同时促进了 SOC 封存。