干旱区生态环境知识资源中心(Arid): Evapotranspiration characteristics and soil water balance of alfalfa grasslands under regulated deficit irrigation in the inland arid area of Midwestern China

Arid

DOI	10.1016/j.agwat.2021.107316
	Evapotranspiration characteristics and soil water balance of alfalfa grasslands under regulated deficit irrigation in the inland arid area of Midwestern China
	Liu, Minguo; Wu, Xiaojuan; Yang, Huimin
通讯作者	Yang, HM (corresponding author), Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, 768 Jiayuguanxi Rd, Lanzhou 730020, Peoples R China.
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2022
卷号	260
英文摘要	Drought has been a major limiting factor affecting agricultural production in the world. Accurately quantitative analysis of the dynamic changes of evapotranspiration and soil water balance is very important for effectively managing water resources and improving water use efficiency under water scarcity. Soil water balance for perennial forage is more complex than the annuals due to stronger mots and periodic evapotranspiration. The objective was to explore the evapotranspiration characteristics and soil water balance of alfalfa (Medicago sativa L.) grasslands under border irrigation at different stand ages and irrigation treatments. A 3-yr field experiment with a full irrigation and 6 regulated deficit irrigation treatments was conducted, and growth-related indicators, soil evaporation and soil water dynamics were observed regularly. Daily evapotranspiration and soil water balance were computed using a modified dual-Kc model which is able to simulate evaporation and transpiration separately. The results showed that soil water simulated by the model and the measured value were in good agreement, and regression coefficients were higher than 0.6 and close to 1.0 in most cuts. The change trend of root zone water under deficit irrigation at single growth stages was similar to that under full irrigation. Under irrigation, the transpiration was the main water loss of alfalfa grasslands. The daily actual evapotranspiration of alfalfa in the 1st cut was higher than 8.0 mm d(-1) and even over 15.0 mm d(-1) at the middle and later growth stages. In contrast, in the 2nd and 3rd cut, it was always less than 10.0 mm d(-1). The daily actual evapotranspiration decreased significantly and immediately after cutting, and daily actual transpiration was reduced to less than 1.0 mm d(-1). The change trend of daily actual evapotranspiration under deficit irrigation at single growth stages was also similar to that under full irrigation. The seasonal evapotranspiration could reach 800 mm and was reduced by deficit irrigation. The average proportion of soil evaporation to total evapotranspiration was 18%. With the decrease of irrigation amount, the evapotranspiration, transpiration and irrigation water compensation decreased, while evaporation remained relatively stable and the ratio of evaporation to evapotranspiration increased. A lower relative evapotranspiration deficit (0.041) was obtained under moderate deficit irrigation at the budding stage than those in other deficit cases (0.086 or over). In conclusion, in the arid and semi-arid areas, deficit irrigation could be applied to alfalfa grassland at the budding stage in alfalfa production.
英文关键词	Alfalfa Regulated deficit irrigation Soil water balance Transpiration Soil evaporation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000724198900002
WOS关键词	MEDICAGO-SATIVA L. ; CROP COEFFICIENT ; ROOT-ZONE ; SAP FLOW ; EVAPORATION ; YIELD ; COMPONENTS ; QUALITY ; TRANSPIRATION ; PRODUCTIVITY
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/2XILL650/374527
作者单位	[Liu, Minguo; Wu, Xiaojuan; Yang, Huimin] Lanzhou Univ, State Key Lab Grassland Agroecosyst, Lanzhou 730020, Peoples R China; [Liu, Minguo; Wu, Xiaojuan; Yang, Huimin] Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Lanzhou 730020, Peoples R China
推荐引用方式 GB/T 7714	Liu, Minguo,Wu, Xiaojuan,Yang, Huimin. Evapotranspiration characteristics and soil water balance of alfalfa grasslands under regulated deficit irrigation in the inland arid area of Midwestern China[J],2022,260.
APA	Liu, Minguo,Wu, Xiaojuan,&Yang, Huimin.(2022).Evapotranspiration characteristics and soil water balance of alfalfa grasslands under regulated deficit irrigation in the inland arid area of Midwestern China.AGRICULTURAL WATER MANAGEMENT,260.
MLA	Liu, Minguo,et al."Evapotranspiration characteristics and soil water balance of alfalfa grasslands under regulated deficit irrigation in the inland arid area of Midwestern China".AGRICULTURAL WATER MANAGEMENT 260(2022).