干旱区生态环境知识资源中心(Arid): Considering spatio-temporal dynamics of soil water with evapotranspiration partitioning helps to clarify water utilization characteristics of summer maize under deficit irrigation

Arid

DOI	10.1016/j.jhydrol.2023.129102
	Considering spatio-temporal dynamics of soil water with evapotranspiration partitioning helps to clarify water utilization characteristics of summer maize under deficit irrigation
	Xu, Jiatun; Mu, Qing; Ding, Yibo; Sun, Shikun; Zou, Yufeng; Yu, Lianyu; Zhang, Pengyan; Yang, Nan; Guo, Wei; Cai, Huanjie
通讯作者	Cai, HJ
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2023
卷号	617
英文摘要	Continuously increasing the utilization efficiency of agricultural water resources is vital to ensuring future water and food security. Deficit irrigation (DI) could provide a solution to optimize crop water productivity. Research on the spatio-temporal dynamics of soil water coupled with evapotranspiration partitioning is important for clarifying summer maize (Zea mays L.) water utilization characteristics and crop water productivity under different DI strategies, especially in semi-arid regions. Consequently, a three-year field experiment with full irrigation (CK) and eight DI treatments (T1-T8, comprised of combinations of 100 %, 80 %, and 60 % of crop evapotranspiration) was conducted. Data from large-scale weighing lysimeters, micro-lysimeters, and TDR sensors were combined to assess daily root water absorption at different soil depths, actual evapotranspiration (ETa) partitioning into plant transpiration (T) and soil water evaporation (E), and water use efficiency (WUE). Results showed that soil water consumption mainly occurred in the 0-40 cm, 0-60 cm, and 0-80 cm soil layers during the maize growth stages of planting-V6, V6-V12, and V12-R6, respectively. Water absorption above the 60-cm soil depth accounted for more than 92 % of the total water consumption. The appropriate irrigation wetting depth for summer maize could be controlled in the top 80-cm layer to avoid deep percolation. DI affected soil water distribution and availability, and thus decreased soil water consumption rate (WCR) and root water absorption amount. Under moderate water deficit conditions, WCR was rapidly restored to the non-waterstressed irrigation treatment level, and even exceeded that level in the deeper layers after a subsequent irrigation was applied, especially in the early maize growth stages. E/ETa was 31.0-32.5 % under full irrigation. DI decreased total soil water evaporation amount, but increased the E/ETa ratio. The threshold soil water value for defining when maize was subjected to water stress was 22.0 % (72 % of FC) during V3-V12, and 18.0 % (60 % of FC) during V12-R1. Our results suggest that less water was used in T1 (moderate DI) than with the full irrigation treatment. WUE increased by 5.5 %-7.5 % as irrigation amount decreased by 12.3-14.5 % and yield decreased by 3.3 %-8.0 %. These results improve our understanding of maize water consumption characteristics with regard to soil water absorption in different soil layers and evapotranspiration partitioning, and provide implications for efficient water management in arid areas of northwest China.
英文关键词	Deficit irrigation Soil water consumption Evapotranspiration partitioning Soil water evaporation Water use efficiency
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000962473300001
WOS关键词	WINTER-WHEAT ; CROP COEFFICIENT ; USE EFFICIENCY ; EVAPORATION ; FIELD ; TRANSPIRATION ; ENVIRONMENT ; SPRINKLER ; LYSIMETER ; CHINA
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/397378
推荐引用方式 GB/T 7714	Xu, Jiatun,Mu, Qing,Ding, Yibo,et al. Considering spatio-temporal dynamics of soil water with evapotranspiration partitioning helps to clarify water utilization characteristics of summer maize under deficit irrigation[J],2023,617.
APA	Xu, Jiatun.,Mu, Qing.,Ding, Yibo.,Sun, Shikun.,Zou, Yufeng.,...&Cai, Huanjie.(2023).Considering spatio-temporal dynamics of soil water with evapotranspiration partitioning helps to clarify water utilization characteristics of summer maize under deficit irrigation.JOURNAL OF HYDROLOGY,617.
MLA	Xu, Jiatun,et al."Considering spatio-temporal dynamics of soil water with evapotranspiration partitioning helps to clarify water utilization characteristics of summer maize under deficit irrigation".JOURNAL OF HYDROLOGY 617(2023).