干旱区生态环境知识资源中心(Arid): The Dynamic Yield Response Factor of Alfalfa Improves the Accuracy of Dual Crop Coefficient Approach under Water and Salt Stress

Arid

DOI	10.3390/w12051224
	The Dynamic Yield Response Factor of Alfalfa Improves the Accuracy of Dual Crop Coefficient Approach under Water and Salt Stress
	Hu, Yanzhe; Kang, Shaozhong; Ding, Risheng; Du, Taisheng; Tong, Ling; Li, Sien
通讯作者	Ding, RS
来源期刊	WATER
EISSN	2073-4441
出版年	2020
卷号	12 期号:5
英文摘要	The accurate quantification of crop water use or evapotranspiration (ET) under water and salt stress is needed for efficient water management and precision irrigation in water scarce regions. However, few studies were examined on alfalfa water use and its components under water and salt stress. We carried out two field experiments to quantify alfalfa water use through setting up different water and salt gradients, including two irrigation levels (full and deficit irrigation) and four soil salinity levels (0, 2 parts per thousand, 4 parts per thousand and 6 parts per thousand salt of mass ratio) in an arid region of Northwest China. Electrical conductivity of soil saturation extract (ECe), soil water content (SWC), leaf area index (LAI) and soil evaporation (E) were measured. The SIMDualKc model, which uses the FAO56 dual K-c approach, was calibrated and validated using measured SWC and E. Model results show a good agreement between observed and simulated SWC and E without stress. The depletion fraction for no stress (p) and the percent yield reduction per unit increase in soil salinity (b) were 0.50 and 6.0%/(dS m(-1)), respectively, slightly lower than those of FAO-56 (0.55 and 7.3%/(dS m(-1))). The difference indicates that alfalfa has a lower capacity of water use but a greater tolerance to salt stress after soil salinity reached its sensitivity threshold in the arid region. The model performed a reduced accuracy under water and salt stress and the differences tended to increase as stress increased, which was partly attributed to constant yield response factor (K-y) under different soil water and salt stress. The key parameter K-y dynamically increased with the increased degree of stress. Compared to constant K-y, the simulations of SWC and E showed improved accuracy with dynamic K-y. These results suggested that the response and acclimation of alfalfa to stress might be incorporated into the dual K-c model through the diversity of K-y.
英文关键词	dual crop coefficient water use water and salt stress yield response factor alfalfa
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000555915200003
WOS关键词	SOIL EVAPORATION ; USE EFFICIENCY ; SALINE WATER ; DEFICIT IRRIGATION ; NORTHERN VICTORIA ; SEED PRODUCTION ; ARID REGION ; EVAPOTRANSPIRATION ; MAIZE ; MODEL
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
来源机构	中国农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325412
作者单位	[Hu, Yanzhe; Kang, Shaozhong; Ding, Risheng; Du, Taisheng; Tong, Ling; Li, Sien] China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China; [Hu, Yanzhe; Kang, Shaozhong; Ding, Risheng; Du, Taisheng; Tong, Ling; Li, Sien] Minist Agr & Rural ffairs, Wuwei Expt Stn Efficient Water Use Agr, Wuwei 733000, Peoples R China
推荐引用方式 GB/T 7714	Hu, Yanzhe,Kang, Shaozhong,Ding, Risheng,et al. The Dynamic Yield Response Factor of Alfalfa Improves the Accuracy of Dual Crop Coefficient Approach under Water and Salt Stress[J]. 中国农业大学,2020,12(5).
APA	Hu, Yanzhe,Kang, Shaozhong,Ding, Risheng,Du, Taisheng,Tong, Ling,&Li, Sien.(2020).The Dynamic Yield Response Factor of Alfalfa Improves the Accuracy of Dual Crop Coefficient Approach under Water and Salt Stress.WATER,12(5).
MLA	Hu, Yanzhe,et al."The Dynamic Yield Response Factor of Alfalfa Improves the Accuracy of Dual Crop Coefficient Approach under Water and Salt Stress".WATER 12.5(2020).