| 引用本文: | 范理权,史海滨,闫建文.局部秋浇条件下冻融期“秋浇-春灌”农田土壤水盐归趋研究[J].灌溉排水学报,0,():-. |
| FAN Liquan,SHI Haibin,YAN Jianwen.局部秋浇条件下冻融期“秋浇-春灌”农田土壤水盐归趋研究[J].灌溉排水学报,0,():-. |
|
| 摘要: |
| 摘 要：【目的】探究河套灌区局部秋浇条件下秋浇和非秋浇（翌年春灌）农田在冻融期水盐迁移规律。【方法】基于野外采样观测与室内试验分析，研究了秋浇与非秋浇（翌年春灌）条件下农田冻融期土壤温度变化特征、土壤剖面水分和盐分的时空变化特征。【结果】在局部秋浇后一周内，秋浇农田表层至深层温度降幅逐渐变大，而春灌农田降幅逐渐变小。在冻结过程中，秋浇农田0~60 cm土层温度降至0 ℃以下相比春灌农田早30 d，在消融过程中，秋浇农田0~60 cm土层温度升至0 ℃以上相比春灌农田迟10 d。秋浇后和冻结期是秋浇农田脱盐的关键时期，0~100 cm土层脱盐47.38%；而春灌农田在冻结和消融阶段分别积盐35.68、16.87%。整个冻融期内，秋浇和春灌农田各层盐分净通量均为负值，但秋浇农田盐分通量随着土层深度的增加而增加；而春灌农田随着土层深度的增加先增加后减小。【结论】局部秋浇后至冻结期Ⅰ末，秋浇和春灌农田水位之间相互波动，存在水位差，创造了水盐迁移的驱动力，并且在冻结过程中各层温度降至0 ℃以下和消融过程中各层温度升至0 ℃以上存在时间差异，进而导致春灌农田在翌年春灌前呈现积盐状态。本研究可为局部秋浇条件下冻融期灌溉和非灌溉农田水盐运移规律和秋浇、春灌的合理开展提供一定的理论依据。 |
| 关键词: 局部秋浇;春灌;冻融期;水盐迁移 |
| DOI： |
| 分类号:s275 |
| 基金项目:十四五重点研发计划(2021YFC3201202)；内蒙古水利科技重大专项(NSK2017-M1)；国家自然基金(51769024)；内蒙古自然基金(2020MS05052) |
|
| Study on soil water and salt return in the freeze-thaw period of "autumn watering-spring irrigation" under local autumn watering conditions |
|
FAN Liquan, SHI Haibin, YAN Jianwen
|
|
School of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University
|
| Abstract: |
| Abstract: 【Objective】To study the water and salt migration law of autumn irrigated and non-autumn irrigated farmland (spring irrigated next year) during freeze-thaw period under partial autumn irrigated conditions in Hetao Irrigation district.【Method】Based on field sampling observation and laboratory experiment analysis, the variation characteristics of soil temperature, and the temporal and spatial variation characteristics of soil moisture and salinity were studied under the condition of autumn watering and non-autumn watering (spring irrigation in the next year) during freeze-thaw period.【Result】In one week after partial autumn irrigation, the temperature drop from surface to deep layer of autumn irrigated farmland gradually increased, while that of spring irrigated farmland gradually decreased. In the freezing process, the temperature of 0~60 cm soil layer of autumn irrigated farmland fell below 0 ℃ 30 d earlier than that of spring irrigated farmland; in the melting process, the temperature of 0~60 cm soil layer of autumn irrigated farmland rose above 0 ℃ 10 d later than that of spring irrigated farmland. After autumn watering and freezing period are the key periods for desalting of autumn irrigated farmland, with the desalting of 0~100 cm soil layer 47.38%. However, salt accumulation in spring irrigation fields was 35.68 and 16.87% in freezing and melting stages, respectively. During the whole freeze-thaw period, the net salt flux in each layer of autumn irrigated and spring irrigated fields was negative, but it increased with the increase of soil depth. However, with the increase of soil depth, spring irrigation farmland first increased and then decreased.【Conclusion】From local autumn pouring to the end of freezing period I, the water level of autumn pouring and spring irrigation field fluctuated with each other, and there was a water level difference, which created the driving force of water and salt migration. Moreover, there was a time difference between the temperature of each layer dropping below 0 ℃ in freezing process and the temperature of each layer rising above 0 ℃ in melting process, which led to the salt accumulation state of spring irrigation field before spring irrigation in the next year. This study can provide some theoretical basis for the law of water and salt migration in irrigated and non-irrigated farmland and the rational development of autumn irrigation and spring irrigation under local autumn watering conditions. |
| Key words: local autumn watering; spring irrigation; freeze-thaw period; Water-salt migration |
