秸秆还田深度对土壤团聚体组成及有机碳含量的影响
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S147.35;S513

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辽宁省重点研发计划项目(2019JH2/10200004)、辽宁省兴辽英才计划项目(XLYC1905010)和辽宁省教育厅重点项目资助。


Effects of Different Straw-Returning Depths on Soil Aggregate Composition and Organic Carbon Distribution
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    摘要:

    为探究玉米秸秆还田至不同深度后对土壤团聚体及有机碳含量的影响,采用田间微区试验,将秸秆磨碎后分别还田至0~10、10~20、20~30、30~40 cm 4个深度土层,同时设置不还田对照,共计5个处理,连续种植玉米两年后采集土壤样品,采用湿筛法将团聚体分为>2、2~0.25、<0.25 mm共3个粒级,测定了土壤及团聚体内有机碳含量。结果表明:①秸秆还田至不同深度后土壤的团聚体稳定性以及大粒级团聚体(>2 mm)含量均显著增加(P<0.05),秸秆还田至0~10 cm和30~40 cm后粒径>0.25 mm的团聚体含量增加幅度较大,对土壤结构的改善效果更佳;②粉碎状秸秆一次性还田至0~10、10~20、20~30 cm两年后土壤有机碳含量降低,还田至30~40 cm两年后土壤有机碳含量显著增加(P<0.05);③秸秆的输入会促进土壤中团聚体的团聚化过程,不同深度还田后对团聚体有机碳分布的影响不同,但都增加了大粒级团聚体内有机碳的含量。以上结果表明,秸秆还田会改善土壤结构,促进有机碳的转化,还田至30~40 cm对土壤的团聚化过程促进作用更明显,土壤有机碳含量显著增加,因此,30~40 cm为更合理的秸秆还田深度。

    Abstract:

    In order to explore the effects of straw-returning depth on aggregate composition and organic carbon distribution in aggregates and soil, brown soil in Liaoning was used for a field micro-area experiment with crushed corn straw returning, in which 5 treatments were set up:CK (no straw returning) and four straw-returning depths of 0-10 cm, 10-20 cm, 20-30 cm, and 30-40 cm. Corn was planted and soil was taken in 2 years after straw-returning. Wet sieve method was used to obtain soil aggregates of 3 particle sizes:> 2 mm, 2-0.25 mm and <0.25 mm, and organic carbon contents in soil and aggregates was determined. The results showed that:1) The stability of aggregates and the content of large aggregates (>2 mm) were increased significantly after straw-returning to different soil depths (P<0.05). Returning straw to 0-10 cm and 30-40 cm increased the content of >0.25 mm aggxegates greatly, indicating the better improvement on soil structure; 2) Organic carbon content was reduced after straw-returning to 0-10 cm, 10-20 cm and 20-30 cm at one time two years later, and organic carbon content was significantly improved after straw-returning to 30-40 cm (P<0.05); 3) The input of straw promoted soil agglomeration process. Straw-returning to different depths had different impact on the distribution of aggregate organic carbon, but they all increased the content of organic carbon in large aggregates. The above results show that straw-returning improves soil structure and promotes the conversion of organic carbon from small aggregates to large aggregates, straw-returning to 30-40 cm has a more obvious promotion effect on soil agglomeration process and increases significantly soil organic carbon, thus, 30-40 cm is the more reasonable depth for straw returning.

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宋依依,曹阳,段鑫盈,李嘉琦,朱晓晴,邹洪涛,张玉龙.秸秆还田深度对土壤团聚体组成及有机碳含量的影响[J].土壤,2022,54(2):344-350. SONG Yiyi, CAO Yang, DUAN Xinying, LI Jiaqi, ZHU Xiaoqing, ZOU Hongtao, ZHANG Yulong. Effects of Different Straw-Returning Depths on Soil Aggregate Composition and Organic Carbon Distribution[J]. Soils,2022,54(2):344-350

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  • 收稿日期:2021-05-01
  • 最后修改日期:2021-11-14
  • 录用日期:2021-11-15
  • 在线发布日期: 2022-04-15
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