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凍融循環(huán)恢復土壤壓實過程中大孔隙作用研究
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山西省重點研發(fā)計劃項目(2022ZDYF120、2022ZDYF115)、中央引導地方科技發(fā)展資金項目(YDZJSX2022C017)和山西省現(xiàn)代農業(yè)產業(yè)技術體系項目(2023CYJSTX05-19)


Role of Macropores for Soil Compaction Restoring during Freeze-thaw Cycles
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    摘要:

    農機壓實土壤的問題很難避免,而農田壓實土壤的結構恢復至關重要,凍融循環(huán)是恢復壓實土壤的有效方法。為了研究凍融循環(huán)+大孔隙對恢復壓實土壤的作用,通過室內試驗重塑壓實土壤及人工孔隙措施模擬大孔隙,在不同土壤含水率條件下設計不同的凍融循環(huán)次數(shù),利用溫度傳感器監(jiān)測土壤溫度波動,同時對比凍融循環(huán)前后壓實土壤孔隙與團聚體參數(shù)的變化。結果表明,凍融循環(huán)過程中,有人工孔隙壓實土壤在高、低兩種含水率條件下,分別在第3次和第2次凍融循環(huán)時開始大幅溫度波動,相同含水率條件下無人工孔隙的壓實土壤溫度大幅波動則出現(xiàn)在第7次和第4次凍融循環(huán),經歷多次凍融循環(huán)后,有人工孔隙壓實土壤的團聚體平均尺度、結構系數(shù)等參數(shù)均優(yōu)于無人工孔隙的壓實土壤。人工孔隙可通過調節(jié)土壤溫度波動改變凍融循環(huán)在土壤中的作用強度,加速壓實土壤結構恢復進程,凍融循環(huán)+大孔隙策略是改善土壤孔隙及團聚體結構的有效措施。

    Abstract:

    The problem of soil compaction by agricultural machinery is almost unavoidable, so structural restoration of compacted soils is essential and the freeze-thaw cycle is an effective method for restoring compacted soil. In order to study the role of freeze-thaw cycle + macropore on the recovery of compacted soil, the indoor experiments were carried out to remodel the compacted soil and simulate the macropore by artificial pore measures, the number of freeze-thaw cycles was designed to be different under two soil water contents, the temperature fluctuation of the soil temperature was monitored by using temperature sensors, and at the same time, the changes of the pore and aggregate parameters of the compacted soil before and after the freeze-thaw cycle were compared. The results showed that during the freeze-thaw cycle, the temperature fluctuation of the compacted soil with artificial pores started at three and two cycles under the conditions of high and low water contents, respectively, while the temperature fluctuation of the compacted soil without artificial pores under the same water content conditions appeared at seven and four cycles, and the average scale of the aggregate and the structure coefficient of the compacted soil with artificial pores were all better than those of the compacted soil without artificial pores after freeze-thaw cycles. Artificial pores can change the intensity of freezethaw cycles in soil by adjusting the soil temperature fluctuation, and accelerate the process of structural recovery of compacted soil, i.e., the strategy of freeze-thaw cycles + macropores was an effective measure to improve the pore and aggregate structure of soil.

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賀亭峰,張慧清,張冬梅,劉化濤,孔猛,丁啟朔.凍融循環(huán)恢復土壤壓實過程中大孔隙作用研究[J].農業(yè)機械學報,2023,54(10):340-347. HE Tingfeng, ZHANG Huiqing, ZHANG Dongmei, LIU Huatao, KONG Meng, DING Qishuo. Role of Macropores for Soil Compaction Restoring during Freeze-thaw Cycles[J]. Transactions of the Chinese Society for Agricultural Machinery,2023,54(10):340-347.

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  • 收稿日期:2023-07-10
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  • 在線發(fā)布日期: 2023-07-30
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