数字农科院2.0

Both carbon sequestration and yield are related to particulate organic carbon stability affected by organic amendment origins in mollisol

文献类型： 外文期刊

作者： Xiaojing Qu;Xiaohan Wang;Jinggui Wu;Ping He

作者机构：

关键词： 13C NMR;Carbon sequestration;Organic amendment;Particulate organic carbon;Yield

期刊名称： Journal of Soils and Sediments

ISSN： 1439-0108

年卷期： 2021 年 21.0 卷 9.0 期

页码：

收录情况： JCR（2021版）

摘要： 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.

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