干旱区生态环境知识资源中心(Arid): Simulation and evaluation of soil water and salt transport under controlled subsurface drainage using HYDRUS-2D model

Arid

DOI	10.1016/j.agwat.2022.107899
	Simulation and evaluation of soil water and salt transport under controlled subsurface drainage using HYDRUS-2D model
	Dou, Xu; Shi, Haibin; Li, Ruiping; Miao, Qingfeng; Yan, Jianwen; Tian, Feng; Wang, Bo
通讯作者	Shi, HB
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2022
卷号	273
英文摘要	Controlled drainage is an important measure to improve salinized soil in arid and semi-arid areas. However, free drainage during the growth period leads to excessive water loss, and crops lack water in the later growth period, resulting in crop yield reduction. Therefore, in arid and semi-arid areas, soil salts should be leached during the non-growing period, and drainage should be controlled during the growing period to ensure that crops have adequate water absorption and utilization, improve soil water availability for optimal water supply and salinity control. In this study, through field trials in 2020 and 2021, 3 treatments were set up. The depth of free drainage (FD) is common subsurface pipe drainage and the controlled drainage in the growth period were 40 cm (CWT1) and 70 cm (CWT2), respectively, and the drainage depth in the non-growing period was 100 cm. Using the HYDRUS-2D model to simulate the dynamic changes of soil water and salts in the 0-100 cm range, the calibration and validation of the HYDRUS-2D model were performed using the measured soil water and salt content values of 2020 and 2021. The results showed that the simulated soil water and salt contents agreed well with the measured contents. Controlled Drainage (CD) is a new agricultural drainage management practice that involves periodically increasing the outlet elevation of subsurface drainage pipes, CD significantly increased the water content of the 0-100 cm soil layer-especially at 0-40 cm depth-after growth stage irrigation. Under FD, CWT1, and CWT2, the 2-year mean soil water content of the 0-40 cm soil layer after growth stage irrigation in 2020 and 2021 was respectively 0.263, 0.278, and 0.267 cm(3) cm(-3), with the latter two values being higher by 5.70 % and 1.52 % than the former value, respectively. Soil water uptake by sunflower after irrigation mainly occurred in the 0-40 cm soil layer, which contributed 55.88-78.51 % of the total soil water uptake. Soil re-salinization occurred in the late growth stage (the flowering stage) under different treatments, with a mean re-salinization rate (relative to the period before spring irrigation) of 29.29 %, 33.48 %, and 30.34 % under FD, CWT1, and CWT2, respectively. Although the re-salinization rate was relatively high under CWT1 and CWT2, it had a low effect on crop growth as well as crop yield. HYDRUS-2D simulation was performed to compare different drain depths in the growth stage in order to determine the optimal drain depth for sunflower in moderately saline soils. To this end, the following metrics were considered for the main root zone (0-40 cm): soil water content, soil salt content, soil de-salination rate during spring irrigation, and soil re-salination rate in the late growth stage. Reduce soil salt content during spring irrigation, increase soil water content after irrigation during growth period, and minimize soil salt return rate in late growth stage, that is, to provide suitable water conditions for crop growth and minimize salt stress. The optimal drain depth during the growth stage was ultimately determined to be 50 cm.
英文关键词	Water and salt transport Saline irrigation area Controlled drainage Sunflower HYDRUS-2D
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000874959200006
WOS关键词	NITRATE LOSS ; IRRIGATION ; SALINITY ; LOSSES ; GROUNDWATER ; MANAGEMENT ; DYNAMICS ; FIELDS ; CROPS
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391647
推荐引用方式 GB/T 7714	Dou, Xu,Shi, Haibin,Li, Ruiping,et al. Simulation and evaluation of soil water and salt transport under controlled subsurface drainage using HYDRUS-2D model[J],2022,273.
APA	Dou, Xu.,Shi, Haibin.,Li, Ruiping.,Miao, Qingfeng.,Yan, Jianwen.,...&Wang, Bo.(2022).Simulation and evaluation of soil water and salt transport under controlled subsurface drainage using HYDRUS-2D model.AGRICULTURAL WATER MANAGEMENT,273.
MLA	Dou, Xu,et al."Simulation and evaluation of soil water and salt transport under controlled subsurface drainage using HYDRUS-2D model".AGRICULTURAL WATER MANAGEMENT 273(2022).