| Cite this article: | 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,():-. |
|
| |
|
|
| This article has been：Browse 866Times Download 0Times |
|
|
|
| DOI： |
|
| 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 |
|
|
|
|
|
|
