添加玉米秸秆对白浆土重组有机碳及团聚体组成的影响

发布时间：2018-06-01 01:36

本文选题：白浆土 + 成土母质　；参考：《土壤学报》2017年04期

【摘要】：研究添加有机物料后,土壤重组有机碳含量变化及其对土壤团聚体组成的影响,对于科学评价秸秆还田对土壤的培肥作用及其环境效应具有重要意义。采用室内培养试验,培养120 d,研究耕作白浆土耕层土壤和母质层中添加不同比例秸秆对土壤重组有机碳积累量、团聚体组成及各粒级团聚体中有机碳分布的影响。结果表明:随秸秆施用量增加,耕层土壤和母质的重组有机碳含量均呈同步增加趋势,耕层土壤和母质相比,重组有机碳增量差异不大,两者增量差值仅为0.34 g kg-1,但两者的有机碳增率差异很大,耕层土壤仅为85.51%,母质则高达556.23%。说明在成土过程中,耕层土壤中有机质的累积会降低其固碳潜力,而在母质层中,其固碳"位点"处于"空置"状态,因此有很强的固碳潜力。同时,秸秆的添加,促进了土壤中小粒径团聚体(0.25 mm)向大团聚体(0.25mm)的转化,耕层土壤和母质土壤在秸秆添加量为3%和2%时大团聚体中有机碳的贡献率最高,分别为69.90%和65.48%。在白浆土中添加玉米秸秆培养后,其母质的固碳能力大于耕层土壤。
[Abstract]:The study on the change of soil recombined organic carbon content and its effect on the composition of soil aggregates after the addition of organic materials is of great significance for the scientific evaluation of the effects of straw returning to the soil on soil fertility and its environmental effects. The effects of different proportion of straw on the accumulation of soil recombined organic carbon, composition of aggregates and distribution of organic carbon in different grain-grade aggregates of cultivated white soil were studied in laboratory culture experiment for 120 days. The results showed that with the increase of straw application rate, the content of ROC in topsoil and parent material increased synchronously, and there was no significant difference in the increment of ROC between tilling layer soil and parent material. The increment difference was only 0.34 g 路kg ~ (-1), but the increase rate of organic carbon was very different between the two groups. The content of soil in tilling layer was only 85.51g 路kg ~ (-1), and the content of parent material was as high as 556.233. The results show that the accumulation of organic matter in the cultivated soil will reduce its carbon sequestration potential in the soil-forming process, while in the parent layer, the carbon sequestration "site" is in a "vacant" state, so it has a strong carbon sequestration potential. At the same time, the addition of straw promoted the transformation of small particle size aggregate (0.25 mm) to large aggregate (0.25 mm). The contribution rate of organic carbon in tilling layer soil and parent soil was the highest, 69.90% and 65.48%, respectively, when straw addition was 3% and 2% respectively. The carbon sequestration ability of parent material was higher than that of topsoil.
【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)资助~~
【分类号】：S153.6

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