[1]Zhang Chao,Duan Shufang,Gao Mingxia,et al.Effects of Long-Term Fertilization on Soil Water Characteristics in Rainfed Farmland[J].Research of Soil and Water Conservation,2024,31(06):168-175,187.[doi:10.13869/j.cnki.rswc.2024.06.040]
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 06
Page number:
168-175,187
Column:
Public date:
2024-12-10
- Title:
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Effects of Long-Term Fertilization on Soil Water Characteristics in Rainfed Farmland
- Author(s):
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Zhang Chao1, Duan Shufang2, Gao Mingxia1,3, Yang Xueyun2, Zhang Shulan2, Feng Hao3,4, Sun Benhua2,4
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(1.College of Water Resources and Architectural Engineering, Yangling, Shaanxi 712100, China; 2.College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Green and Low Carbon Agriculture on Dryland in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling, Shaanxi 712100, China; 3.College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 4.Institute of Water-Saving Agriculture...)
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- Keywords:
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rainfed farmland; long-term fertilization; soil physical and chemical properties; water characteristic curve; soil water constants
- CLC:
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S152.7
- DOI:
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10.13869/j.cnki.rswc.2024.06.040
- Abstract:
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[Objective]The aims of this study are to explore the changes of soil water characteristics and their relationship with soil physical & chemical properties under long-term different fertilization, and to provide a scientific basis for reasonable fertilization on rainfed farmland in Guanzhong area. [Methods]Five treatments were selected from a long-term fertilization experiment on rainfed farmland: No fertilizer(CK), Nitrogen fertilization(N), Nitrogen-Phosphorus fertilization(NP), Nitrogen-Phosphorus-Potassium fertilization(NPK), and Organic manure combined with NPK fertilization(MNPK). The soil organic matter(SOM), cation exchange capacity(CEC), plasticity, bulk density and water characteristic curves were measured. The soil water characteristic parameters and pore size distribution were obtained by V-G model, and the mechanism of soil water characteristic change caused by long-term fertilization was analyzed. [Results]Compared with CK, long-term nitrogen fertilization(N)only significantly increased SOM(rate of increase, 6.8%), bulk density(8.7%)and plasticity index(3.0%), whereas other fertilization treatments significantly increased SOM(31.4%~78.4%), CEC(1.5%~7.7%), upper plastic limit(8.1%~14.8%), lower plastic limit(7.9%~18.7%)and plasticity index(8.3%~10.4%), in which MNPK increased these indicators the most. The change trend of soil water characteristic curves was basically the same for all treatments, which could be well simulated by V-G model. Compared with CK, MNPK significantly increased soil field water capacity(39.0%), wilting point(64.7%), effective water content(22.5%), rapidly available water content(18.1%)and slowly available water content(37.5%), however, other fertilization treatments only increased some of soil water characteristics indexes. Fertilization reduced the proportion of macropores, while the treatments of MNPK, NPK and N increased the proportion of mesopores and micropores. The total explanatory degree of SOM, CEC, bulk density and plasticity index on the variation of soil moisture characteristics was 99.99%(p<0.05), in which SOM(55.2%, p=0.034)and CEC(40.7%, p=0.022)contributed significantly. [Conclusion]Combined application of organic manure and inorganic fertilizer can significantly reduce soil bulk density, increase SOM, CEC, soil saturated water content, field water holding capacity, effective water content, and can improve soil water retention and supply better, which is the best fertilization mode for rainfed agriculture in arid and semi-arid areas. SOM and CEC are two important factors affecting soil water characteristics, and the higher the SOM and CEC, the stronger the soil water retention and the more soil available water. Improving the level of SOM is the primary way to improve soil water retention and utilization efficiency in rainfed farmland.