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智能化农业装备学报（中英文）

智能化农业装备学报（中英文） ›› 2022, Vol. 3 ›› Issue (1): 20-26.DOI: 10.12398/j.issn.2096-7217.2022.01.003

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秸秆还田年数对稻麦轮作农田土壤团聚体碳氮分布的影响

崔思远1,2， 曹光乔1,2   

  1. 1. 农业农村部南京农业机械化研究所，江苏南京，210014；2. 农业农村部现代农业装备重点开放实验室，江苏南京，210014
  • 出版日期:2022-05-15 发布日期:2022-07-11
  • 通讯作者: 曹光乔

Effects  of straw return  years on  organic carbon and total nitrogen distribution in soil aggregates from rice-wheat rotation fields 

Cui Siyuan1,2, Cao Guangqiao1,2   

  1. 1. Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China；2. Key Laboratory of Modern Agricultural Equipment, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China
  • Online:2022-05-15 Published:2022-07-11
  • Contact: Cao Guangqiao
  • About author:Cui Siyuan, Doctor, Assistant Professor, research interests: farmland soil ecology.
  • Supported by:
    Science and Technology Innovation Project of Chinese Academy of Agricultural Sciences (Agricultural Academy Office (2014) No.216)； Fundamental Research Funds for the Central Public Research Institutes (S20201002)

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摘要： 探究不同秸秆还田年数对稻麦复种农田土壤团聚体及其中有机碳和全氮分布的影响对提升该区土壤质量具有重要意义。田间试验始于2010年，设置秸秆不还田（NR），秸秆还田1年（SR1），秸秆还田2年（SR2），秸秆还田3年（SR3），秸秆还田4年（SR4），秸秆还田5年（SR5），秸秆还田6年（SR6），秸秆还田7年（SR7），秸秆还田8年（SR8）9个处理。结果表明，随着秸秆还田年数增加，>2 mm团聚体呈上升趋势，0.25～2 mm和<0.053 mm团聚体呈下降趋势，0.053～0.25 mm团聚体变化幅度不大。>0.25 mm 大团聚体对全土有机碳和全氮的贡献率最大。土壤有机碳和全氮含量与>2 mm、>0.25 mm团聚体含量呈极显著正相关关系，与0.25～2 mm、<0.053 mm、<0.25 mm团聚体含量呈极显著负相关关系。综上所述，持续秸秆还田对改善土壤团聚体结构，促进土壤有机碳和全氮向大团聚体转移具有积极作用。

关键词: 秸秆还田年数, 水稳性团聚体, 有机碳, 全氮, 稻麦轮作, 贡献率

Abstract: Exploring the effects of straw returning years on soil aggregates and the distribution of organic carbon and total nitrogen in rice-wheat cropping fields is of great significance for improving its soil quality. Field experiment was conducted in 2010 with 9 treatments: no straw returning (NR), 1 year of straw returning (SR1), 2 years of straw returning (SR2), 3 years of straw returning (SR3), 4 years of straw returning (SR4), 5 years of straw returning (SR5), 6 years of straw returning (SR6), 7 years of straw returning (SR7), and 8 years of straw returning (SR8). The results showed that with the increase of straw returning years, the proportion of >2 mm aggregates increased, the proportion of 0.25-2 mm and <0.053 mm aggregates decreased, while the proportion of 0.053-0.25 mm aggregates had little change. The contributing rate of total soil organic carbon and total nitrogen was the highest in >0.25 mm macro-aggregates. Contents of soil organic carbon and total nitrogen were significantly positively correlated with the proportion of >2 mm and >0.25 mm aggregates, while negatively correlated with the proportion of 0.25-2 mm, <0.053 mm and <0.25 mm aggregates. In conclusion, continuous straw returning has positive effects on improving the soil aggregates fraction and promoting the transfer of soil organic carbon and total nitrogen to large aggregates.

Key words:  years of straw returning, water-stable aggregates, organic carbon, total nitrogen, rice-wheat cropping, contribution rate

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