干旱区生态环境知识资源中心(Arid): Modeling strategies to balance salt leaching and nitrogen loss for drip irrigation with saline water in arid regions

Arid

DOI	10.1016/j.agwat.2022.107943
	Modeling strategies to balance salt leaching and nitrogen loss for drip irrigation with saline water in arid regions
	Che, Zheng; Wang, Jun; Li, Jiusheng
通讯作者	Wang, J ; Li, JS
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2022
卷号	274
英文摘要	Soil salinization has severely constrained agricultural sustainability in arid and semi-arid regions. Generally, using additional irrigation water to leach excessive salts is a widely used strategy for alleviating soil salt accumulation in the root zone. Nevertheless, this practice simultaneously increases the risk of nitrogen loss. To address this contradiction, a new index, namely, the leaching balance index of soil salinity and nitrogen (LBI), which was defined by multiplying the nitrogen leaching fraction (NLF) by the absolute value of the discrepancy between the crop tolerance salinity threshold and soil salinity (vertical bar Delta SSC vertical bar), was proposed. The lower the index value is, the better the soil salt and nitrogen leaching can reach an optimal equilibrium state. Soil salt leaching and nitrogen loss were simulated by the HYDRUS-2D model. The two-year field observation data of soil moisture, salinity, ammonium, and nitrate nitrogen contents were collected for calibration and validation. A model case was presented using the LBI to investigate the appropriate mulched drip irrigation and fertigation management practices with different levels of salty waters for cotton in Xinjiang in this study. In the testing process, the normalized root mean square error (nRMSE) provided by this model was 2-13 %, 5-14 %, 20-40 %, and 14-27 % for soil water content (SWC), soil salinity (EC1:5), NH4+-N, and NO3--N, respectively, and the index of agreement (d) was 0.63-0.94, 0.83-0.99, 0.69-0.97, and 0.86-0.96, respectively. Then, the simulation scenarios were established to minimize the NLF and the vertical bar Delta SSC vertical bar and thus the LBI. The results showed that increasing the number of fertigation splits could reduce the LBI. Specifically, five fertigation splits during the growing season could result in a decrease in the LBI of 21-32 %. Furthermore, when applying an irrigation amount of 100% ETc, the alternate use of water salinities of 6.0 dS m(-1) and 10.0 dS m(-1) at the squaring stage and flower boll stage produced a lower LBI. The irrigation scheme of a higher water salinity and irrigation amount during the squaring stage, coupled with a lower water salinity and irrigation amount during the flower boll stage, was beneficial for decreasing the LBI. The lower the value of LBI is, the more sustainable the irrigation and soil management will be. The new index of the LBI proposed by our study represents one of the first efforts to solve the contradiction between salt accumulation and nitrogen loss, which will ultimately aid in the salt control and efficient utilization of water and nitrogen for arid and semi-arid regions.
英文关键词	Soil salinization Microirrigation Cotton Fertigation Leaching HYDRUS
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000876791000006
WOS关键词	HYDRAULIC CONDUCTIVITY ; NUTRIENT MANAGEMENT ; SOIL SALINIZATION ; CLIMATE-CHANGE ; ROOT WATER ; NITRATE ; YIELD ; FERTIGATION ; GROUNDWATER ; TRANSPORT
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/2XILL650/391651
推荐引用方式 GB/T 7714	Che, Zheng,Wang, Jun,Li, Jiusheng. Modeling strategies to balance salt leaching and nitrogen loss for drip irrigation with saline water in arid regions[J],2022,274.
APA	Che, Zheng,Wang, Jun,&Li, Jiusheng.(2022).Modeling strategies to balance salt leaching and nitrogen loss for drip irrigation with saline water in arid regions.AGRICULTURAL WATER MANAGEMENT,274.
MLA	Che, Zheng,et al."Modeling strategies to balance salt leaching and nitrogen loss for drip irrigation with saline water in arid regions".AGRICULTURAL WATER MANAGEMENT 274(2022).