添加玉米秸秆对黑钙土重组有机碳含量及有机无机复合的影响

发布时间：2018-03-07 10:01

本文选题：黄土母质　切入点：红土母质　出处：《农业环境科学学报》2017年09期 　论文类型：期刊论文

【摘要】：为了科学评价土壤的固碳性能和潜力,以黄土和红土母质及其发育的黑钙土为供试土壤,在田间调查的基础上,分别采集耕层和母质层土壤样品,研究添加有机物料后土壤重组有机碳含量、有机无机复合状况的变化。针对东北玉米主产区黑钙土秸秆还田技术推广中亟待阐明的科学问题,通过室内恒温培养试验模拟了一个作物生长期内,黑钙土母质和耕层土壤添加不同比例的玉米秸秆后,重组有机碳含量和有机无机复合状况的变化。结果表明:随秸秆添加量的增加,供试耕层土壤和母质中的重组有机碳含量、原土有机碳复合量均呈同步增加趋势,但原土有机碳复合度呈逐步下降趋势。在耕层土壤中,原土有机碳含量越低的土壤,其重组有机碳增量和原土有机碳复合量增率越大,说明原土有机碳含量低的土壤具有更大的固碳潜力。母质层土壤重组有机碳增量、原土有机碳复合量增率和追加复合量均大于耕层土壤,说明母质的固碳潜力远大于耕层土壤,且红土母质的固碳潜力更强。
[Abstract]:In order to evaluate the carbon sequestration performance and potential of soil scientifically, the soil samples of tilling layer and parent layer were collected on the basis of field investigation, taking the parent material of loess and laterite and its developed calcareous soil as test soil. The changes of soil recombination organic carbon content and organic-inorganic compound status after adding organic materials were studied. The experiment of constant temperature culture in laboratory was carried out to simulate the growth period of a crop, after adding different proportion of corn straw to the parent soil and tilling layer of the calcareous soil. The results showed that with the increase of straw content, the content of recombined organic carbon in topsoil and parent material, the content of organic carbon in original soil increased synchronously. However, the degree of organic carbon in the original soil decreased gradually. The lower the content of organic carbon in the original soil, the greater the increment of the recombined organic carbon and the increase of the amount of organic carbon in the original soil. The results showed that the soil with low organic carbon content had greater carbon sequestration potential. The increment of recombination organic carbon in parent layer, the increase rate of organic carbon in original soil and the addition of organic carbon in original soil were higher than those in topsoil, indicating that the potential of carbon sequestration of parent material was much greater than that of topsoil. The carbon sequestration potential of the parent material of laterite is stronger.
【作者单位】：吉林农业大学资源与环境学院吉林省商品粮基地土壤资源可持续利用重点实验室;
【基金】：国家自然科学基金项目(41403077) 吉林省科技厅科技支撑计划项目(20130204050SF)~~
【分类号】：S141.4;S153.6

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