引黄灌淤耕作对剖面土壤有机质组分构成的影响

发布时间：2018-03-19 13:38

本文选题：引黄灌溉　切入点：土壤　出处：《土壤学报》2017年03期 　论文类型：期刊论文

【摘要】：土壤有机质组分构成是影响土壤有机碳库稳定性最直接的原因。为研究灌溉耕作对不同组分土壤有机质含量变化产生的影响,以宁夏引黄灌区为研究对象,通过密度分组方法,测定并分析土壤轻组和重组有机碳含量的变化。结果表明,经过不同时间的引黄灌溉耕作后,土壤轻组和重组有机质含量增加,但是不同组分,其变化量之间存在差异。在剖面深度上,土壤轻组和重组有机质含量及其增加量均随土层深度的增加而降低,表层土壤轻组和重组有机质增加最显著,土壤有机质组分含量的变化受土壤类型的影响明显。与未受灌溉耕作影响的自然土壤相比,灌溉土壤0~60 cm深度内轻组有机质与总有机质间的相关性增强,而且这种相关性随土层深度增加而减弱;自然土壤和灌溉土壤剖面各层次重组有机质与总有机质间均有极强的相关性,说明重组有机质是土壤有机质最为重要的组分,但轻组有机质对灌溉耕作的响应更加敏感,重组有机质较轻组有机质具有更好的固碳效果。
[Abstract]:In order to study the effect of irrigation tillage on the change of soil organic matter content in different components, the composition of soil organic matter is the most direct reason to affect the stability of soil organic carbon pool. In order to study the effect of irrigation tillage on the change of soil organic matter content of different components, the Yellow River diversion Irrigation area of Ningxia is taken as the research object. The changes of soil light and recombined organic carbon contents were measured and analyzed. The results showed that the light and recombinant organic matter contents of the soil increased after different periods of irrigation, but different components. In the depth of profile, the content and increase of organic matter of light and recombined soil decreased with the increase of soil depth, and the light and recombined organic matter of surface soil increased most significantly. The change of soil organic matter content was obviously affected by the soil type, and the correlation between the light group organic matter and total organic matter in the 0 ~ 60 cm depth of irrigated soil was stronger than that in the natural soil without the effect of irrigation tillage. Moreover, the correlation decreases with the increase of soil depth, and there is a strong correlation between the total organic matter and the recombined organic matter in the natural soil and irrigated soil profile, which indicates that the recombined organic matter is the most important component of the soil organic matter. But the light organic matter is more sensitive to irrigation tillage, and the recombined organic matter has better carbon sequestration effect than the light organic matter group.
【作者单位】：土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所);苏州市农业科学院;中宁县农业技术推广服务中心;
【基金】：国家自然科学基金项目(41501326,41501296) 中国科学院战略性先导科技专项(XDA05050507) 江苏省博士后基金(1202051C)资助~~
【分类号】：S153.6

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