| 不同矿化度咸水结冰灌溉对重度盐碱地土壤水分入渗和盐分运移的影响 |
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| 引用本文： | 李争争,屈忠义,杨威,何婧.不同矿化度咸水结冰灌溉对重度盐碱地土壤水分入渗和盐分运移的影响[J].水土保持学报,2021,35(3):304-311. |
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| 作者姓名： | 李争争 屈忠义 杨威 何婧 |
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| 作者单位： | 内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018 |
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| 基金项目： | 国家自然科学基金项目（41761050） |
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| 摘 要： | 为探究不同矿化度咸水结冰灌溉对重度盐碱地土壤水分入渗和盐分运移的影响。采用室内有机玻璃土柱模拟试验,设置3个梯度灌水水质(蒸馏水、3 g/L微咸水、10 g/L咸水)和2种灌溉方式(结冰灌溉、直接灌溉)的6种不同处理,对土壤的水分入渗特性及脱盐效果进行对比分析研究。结果表明:(1)3个梯度灌水水质下,结冰灌溉方式的土壤初始入渗速率分别是直接灌溉方式的8.2,4.6,5.8倍。结冰灌溉方式下,灌溉水矿化度越高,土壤入渗速率越快;(2)Kostiakov模型适合拟合不同矿化度咸水结冰灌溉方式下的土壤水分入渗过程,Horton模型适合拟合不同矿化度咸水直接灌溉方式下的土壤水分入渗过程;(3)3个梯度灌水水质下,直接灌溉方式0—60 cm土层土壤含水率较结冰灌溉方式分别提高1.4%～6.3%,1.6%～3.6%,0.9%～7.6%;(4)各处理下0—30 cm土层土壤脱盐效果较为显著,盐分不断向土层60 cm处迁移,各处理土壤脱盐率逐渐降低。0—30 cm土层处,淡水直接灌溉方式下土壤脱盐率最大(93%～97%),3 g/L微咸水结冰灌溉的脱盐率次之(87%～91%)。50—60 cm土层处,淡水结冰灌溉方式下土壤脱盐率最高(13.3%),其次为3 g/L微咸水结冰灌溉方式(9.1%)。综合考虑,3 g/L微咸水结冰灌溉能够提高土壤水分入渗速率,有效降低0—60 cm土层的土壤盐分含量。
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| 关 键 词： | 咸水结冰灌溉 入渗 模型模拟 水盐迁移 |
| 收稿时间： | 2020/11/30 0:00:00 |
Effects of Freezing Irrigation with Different Saline Water on Soil Water Infiltration and Salt Transport in Severely Saline-Alkali Soil |
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| LI Zhengzheng,QU Zhongyi,YANG Wei,HE Jing.Effects of Freezing Irrigation with Different Saline Water on Soil Water Infiltration and Salt Transport in Severely Saline-Alkali Soil[J].Journal of Soil and Water Conservation,2021,35(3):304-311. |
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| Authors: | LI Zhengzheng QU Zhongyi YANG Wei HE Jing |
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| Institution: | Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018 |
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| Abstract: | The objective of this study was to determine the effect of freezing irrigation with saline water of different salinity on soil water infiltration and salt transport in severely saline-alkali soil. In order to compare and analyze the soil water infiltration characteristics and desalination effect, this study adopted an indoor simulation test of soil column made of organic glass. Six treatments with 3 different water quality (distilled water, 3 g/L brackish water, 10 g/L saline water) and 2 different methods (freezing irrigation, direct irrigation) were set up. The results showed that:(1) The initial infiltration rate of freezing irrigation was 8.2, 4.6 and 5.8 times higher than those of direct irrigation under three irrigation water quality. Under the freezing irrigation mode, the higher salinity of irrigation water, the faster soil infiltration rate. (2) Kostiakov model was suitable for fitting the soil water infiltration process under different saline water under freezing irrigation. Horton model is suitable for fitting the soil water infiltration process under direct irrigation. (3) The soil moisture contents in 0-60 cm soil layer of direct irrigation increased by 1.4%~6.3%, 1.6%~3.6%, 0.9%~7.6% respectively compared with those of freezing irrigation under the three irrigation water quality. (4) The desalination effect of 0-30 cm soil layer was more significant under each treatment, the salt was moved to 60 cm soil layer continuously, and the desalination rate of each treatment decreased gradually. In 0-30 cm soil, the desalination rate of fresh water under direct irrigation was the highest, which was 93%~97%, followed by 3 g/L of freezing irrigation, which was 87%~91%. In 50-60 cm soil, the desalination rate of fresh water under freezing irrigation was the highest, which was 13.3%, followed by 3 g/L brackish water freezing irrigation, which was 9.1%. Comprehensive consideration, salint water of 3 g/L with freezing irrigation could improve soil water infiltration rate, effectively reduce soil salt content in 0-60 cm. |
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| Keywords: | freezing saline water irrigation infiltration model simulation water and salt migration |
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