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| Effects of straw return and shallow drip irrigation on topsoil water-stable aggregates and carbon content in maize field |
| Received:November 06, 2021 |
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| KeyWord:straw return;irrigation method;water-stable aggregate;soil organic carbon;soil three-phase ratio;maize |
| Author Name | Affiliation | E-mail | | ZHANG Mingwei | College of Agronomy, Inner Mongolia Minzu University, Engineering Research Center of Forage Crops of Autonomous, Tongliao 028043, China | | | YANG Hengshan | College of Agronomy, Inner Mongolia Minzu University, Engineering Research Center of Forage Crops of Autonomous, Tongliao 028043, China | yanghengshan2003@aliyun.com | | TAI Jicheng | College of Agronomy, Inner Mongolia Minzu University, Engineering Research Center of Forage Crops of Autonomous, Tongliao 028043, China | | | FAN Xiuyan | College of Agronomy, Inner Mongolia Minzu University, Engineering Research Center of Forage Crops of Autonomous, Tongliao 028043, China | | | GE Xuanliang | College of Agronomy, Inner Mongolia Minzu University, Engineering Research Center of Forage Crops of Autonomous, Tongliao 028043, China | | | ZHANG Yushan | College of Agronomy, Inner Mongolia Minzu University, Engineering Research Center of Forage Crops of Autonomous, Tongliao 028043, China | | | XU Xiao | College of Agronomy, Inner Mongolia Minzu University, Engineering Research Center of Forage Crops of Autonomous, Tongliao 028043, China | |
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| Abstract: |
| This study aimed to investigate the effects of straw return and irrigation methods on water-stable aggregates and carbon content in topsoil. A split-plot design was carried out from 2019 to 2020, with straw return（S+）and straw removal（S-）as the main treatment and conventional border irrigation（F）and shallow drip irrigation（D）as the secondary treatments. The change in the characteristics of topsoil water-stable aggregate stability and organic carbon fixation capacity under straw return and different irrigation methods were analyzed. The results showed that straw return could significantly increase the content of water-stable aggregates with a particle size of 0.25~5 mm in topsoil and shallow-buried drip irrigation could significantly increase the content of water-stable aggregates with a particle size of 0.25~1 mm. The interaction between straw return and shallow-buried drip irrigation had a positive effect on the content of water-stable aggregates with particle sizes greater than 0.25 mm. Straw return could significantly increase the aggregate content（R0.25）with particle size greater than 0.25 mm and reduce the unstable aggregate index（ELT）. Shallow-buried drip irrigation significantly increased the average mass diameter（MWD）of aggregates. The interaction between straw return and shallow-buried drip irrigation could significantly increase the average MWD and geometric average diameter of water-stable aggregates, thereby improving the stability of aggregates. The interaction of straw return and shallow drip irrigation could also significantly increase the organic carbon content in 0.5~3 mm water-stable macroaggregates and increase the organic carbon enrichment coefficient in 1~3 mm water-stable macro-aggregates, thereby increasing soil organic carbon content. Both straw return and shallow drip irrigation can optimize the soil three-phase ratio, and the effect is more visible in the silking stage. The interaction of straw return and shallow drip irrigation can significantly improve the soil gas phase ratio and generalized soil structure index. Thus, straw return and shallow-buried drip irrigation have significant effects on improving the content and stability of water-stable macroaggregates in topsoil, which can increase the organic carbon content of water-stable macroaggregates with a particle size of 0.5~3 mm and improve the organic carbon enrichment coefficient so as to improve the soil organic carbon content. By optimizing the three soil comparisons, the shallow-buried drip irrigation planting mode under straw return can be used as a planting mode to improve soil fertility and improve the quality of cultivated land. |
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