Rice cultivation can mitigate soil salinization and alkalization by modifying the macropore structure in saline–sodic paddy fields
Rice cultivation is generally accepted as one of the most effective biological strategies for reclaiming saline–sodic soils and ensuring food security; however, the underlying mechanism remains unclear. Soil macropores play a critical role in complex physical coupling processes such as ion absorptio...
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| Language: | English |
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Elsevier
2025-05-01
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| Series: | Agricultural Water Management |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0378377425001878 |
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| author | Wei Peng Xiangming Zhu Wenjuan Zheng Qingyang Xie Mingming Wang Enhua Ran |
| author_facet | Wei Peng Xiangming Zhu Wenjuan Zheng Qingyang Xie Mingming Wang Enhua Ran |
| author_sort | Wei Peng |
| collection | DOAJ |
| description | Rice cultivation is generally accepted as one of the most effective biological strategies for reclaiming saline–sodic soils and ensuring food security; however, the underlying mechanism remains unclear. Soil macropores play a critical role in complex physical coupling processes such as ion absorption and water/salt migration, which are closely associated with soil salinization and alkalization. This study sought to investigate the impact of rice cultivation duration on soil macropores, salinization, and alkalization. Intact soil columns (0–20 cm) sampled from saline–sodic paddy fields with different cultivation durations (1, 5, and 12 years) were scanned using industrial X-ray computed tomography (XCT). Soil pH, soil salt content (SSC), and sodium adsorption ratio (SAR) were measured. Compared with 1 year of cultivation, longer rice cultivation significantly increased macroporosity by 46.25 %–123.34 %, larger macropores (> 200 μm) by 76.58 %–215.20 %, and maximum diameter pores by 30.43 %–65.22 % (P < 0.05). Moreover, macropore morphology and network parameters significantly improved with increasing cultivation duration, while soil pH, SSC, and SAR showed significant decreasing trends. Among them, SSC decreased from 5.64 g kg−1 (1 year of cultivation) to 3.03 g kg−1 (12 years of cultivation) [P < 0.05]. Furthermore, the structural equation model (SEM) indicated that rice cultivation years indirectly affected saturated hydraulic conductivity (Ks) by directly affecting soil macropore parameters, which ultimately affected SAR. In addition to Ks, specific surface area (SA) and fractal dimension (FD) were key factors affecting SSC. This study provides new insight into the underlying mechanisms of salinization and alkalization in rice cultivation from a macropore-scale perspective. |
| format | Article |
| id | doaj-art-7fce803353a4453e947aac9289a3ffc7 |
| institution | OA Journals |
| issn | 1873-2283 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Agricultural Water Management |
| spelling | doaj-art-7fce803353a4453e947aac9289a3ffc72025-08-20T02:14:26ZengElsevierAgricultural Water Management1873-22832025-05-0131310947310.1016/j.agwat.2025.109473Rice cultivation can mitigate soil salinization and alkalization by modifying the macropore structure in saline–sodic paddy fieldsWei Peng0Xiangming Zhu1Wenjuan Zheng2Qingyang Xie3Mingming Wang4Enhua Ran5State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, PR ChinaState Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, PR China; Corresponding author.College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR ChinaState Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, PR ChinaState Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, PR ChinaState Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, PR ChinaRice cultivation is generally accepted as one of the most effective biological strategies for reclaiming saline–sodic soils and ensuring food security; however, the underlying mechanism remains unclear. Soil macropores play a critical role in complex physical coupling processes such as ion absorption and water/salt migration, which are closely associated with soil salinization and alkalization. This study sought to investigate the impact of rice cultivation duration on soil macropores, salinization, and alkalization. Intact soil columns (0–20 cm) sampled from saline–sodic paddy fields with different cultivation durations (1, 5, and 12 years) were scanned using industrial X-ray computed tomography (XCT). Soil pH, soil salt content (SSC), and sodium adsorption ratio (SAR) were measured. Compared with 1 year of cultivation, longer rice cultivation significantly increased macroporosity by 46.25 %–123.34 %, larger macropores (> 200 μm) by 76.58 %–215.20 %, and maximum diameter pores by 30.43 %–65.22 % (P < 0.05). Moreover, macropore morphology and network parameters significantly improved with increasing cultivation duration, while soil pH, SSC, and SAR showed significant decreasing trends. Among them, SSC decreased from 5.64 g kg−1 (1 year of cultivation) to 3.03 g kg−1 (12 years of cultivation) [P < 0.05]. Furthermore, the structural equation model (SEM) indicated that rice cultivation years indirectly affected saturated hydraulic conductivity (Ks) by directly affecting soil macropore parameters, which ultimately affected SAR. In addition to Ks, specific surface area (SA) and fractal dimension (FD) were key factors affecting SSC. This study provides new insight into the underlying mechanisms of salinization and alkalization in rice cultivation from a macropore-scale perspective.http://www.sciencedirect.com/science/article/pii/S0378377425001878Saline–sodic soilIrrigated riceX-ray computed tomography (XCT)Pore size distributionSaturated hydraulic conductivity |
| spellingShingle | Wei Peng Xiangming Zhu Wenjuan Zheng Qingyang Xie Mingming Wang Enhua Ran Rice cultivation can mitigate soil salinization and alkalization by modifying the macropore structure in saline–sodic paddy fields Agricultural Water Management Saline–sodic soil Irrigated rice X-ray computed tomography (XCT) Pore size distribution Saturated hydraulic conductivity |
| title | Rice cultivation can mitigate soil salinization and alkalization by modifying the macropore structure in saline–sodic paddy fields |
| title_full | Rice cultivation can mitigate soil salinization and alkalization by modifying the macropore structure in saline–sodic paddy fields |
| title_fullStr | Rice cultivation can mitigate soil salinization and alkalization by modifying the macropore structure in saline–sodic paddy fields |
| title_full_unstemmed | Rice cultivation can mitigate soil salinization and alkalization by modifying the macropore structure in saline–sodic paddy fields |
| title_short | Rice cultivation can mitigate soil salinization and alkalization by modifying the macropore structure in saline–sodic paddy fields |
| title_sort | rice cultivation can mitigate soil salinization and alkalization by modifying the macropore structure in saline sodic paddy fields |
| topic | Saline–sodic soil Irrigated rice X-ray computed tomography (XCT) Pore size distribution Saturated hydraulic conductivity |
| url | http://www.sciencedirect.com/science/article/pii/S0378377425001878 |
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