| 引用本文: | 穆 敏,李王成,王 洁,等.冻融干湿循环条件下粒径及盐分对土壤
粗颗粒风化速率的影响[J].灌溉排水学报,2024,43(2):41-46. |
| MU Min,LI Wangcheng,WANG Jie,et al.冻融干湿循环条件下粒径及盐分对土壤
粗颗粒风化速率的影响[J].灌溉排水学报,2024,43(2):41-46. |
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| 摘要: |
| 【目的】探究冻融干湿循环条件下，土壤粒径及盐分对土壤粗颗粒风化速率的影响。【方法】以土壤粗颗粒（灰绿板岩）为研究对象，设置粒径（10、20、30 mm）、盐分浓度（3、6、10 g/L及蒸馏水作对照）两因素，开展冻融干湿循环随机试验，分析不同循环次数下土壤粗颗粒风化速率的变化规律。【结果】①在水盐溶液处理下土壤粗颗粒风化速率均比单纯水处理大，10 g/L盐分处理下的土壤粗颗粒风化速率大于其他处理。在20~60次冻融干湿循环之间，10 mm土壤粗颗粒的风化速率随盐分浓度的增加而增大。②土壤粗颗粒风化速率随粒径的增大呈减小趋势，且10 mm的土壤粗颗粒风化速率大约是30 mm的2倍。③土壤粗颗粒风化速率随冻融干湿循环次数的增大而增大，A1B4（10 mm 10 g/L）组合下的土壤粗颗粒风化速率最大。【结论】在冻融干湿循环影响下，小粒径的土壤粗颗粒风化速率大于大粒径，且水盐作用对土壤粗颗粒风化速率的影响大于单纯水作用。 |
| 关键词: 土壤粗颗粒；冻融干湿循环；风化速率；风化成土 |
| DOI：10.13522/j.cnki.ggps.2023089 |
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| Impact of particle size and soil salinity on weathering of mineral particles under freeze-thaw and drying-wetting cycles |
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MU Min, LI Wangcheng, WANG Jie, LIU Qiaoling, LI Yangyang
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1. School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2. Engineering Research Center of
the Ministry of Education for Efficient Utilization of Modern Agricultural Water Resources in Dry Areas, Yinchuan 750021, China;
3. State Key Laboratory of Land of Degradation and Ecological Restoration in Northwest China, Yinchuan 750021, China
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| Abstract: |
| 【Objective】Freezing-thawing and drying-wetting cycles are important abiotic processes in mineral particle weathering and their effect is modulated by many other processes. In this paper, we investigate the impact of particle size and soil salinity on mineral particle weathering.【Method】Green slate particles were used. The experiment consisted of three particle size treatments: 10, 20 and 30 mm, and three soil salinity treatments with salt concentration of the soil water being 3, 6 and 10 g/L, respectively. Each treatment was subjected to randomized freeze-thaw and drying-wetting cycles. During the experiment, we measured the weathering rate of all particles.【Result】① Soil salinity increased particle weathering rate, but the increase depended on soil water concentration. In the treatments we compared, soil water concentration of 10 g/L gave the best results. For the10 mm particles, their weathering rate increased with soil salinity when they were subjected to 20 and 60 freeze-thaw and drying-wetting cycles. ② The weathering rate decreased with particle size, with the weathering rate of the 10 mm particles being two times that of the 30 mm particles. ③ The weathering rate increased with the number of freeze-thaw drying -wetting cycles.【Conclusion】Under the influence of freeze-thaw and drying-wetting cycles, the weathering rate of small particles is higher than that of large particle. Soil salinity also increased the weathering rate, albeit the increasing rate depended on soil water concentration. |
| Key words: soil coarse grains; freeze-thaw dry-wet cycle; weathering rate; weathering into soil |
