干旱区生态环境知识资源中心(Arid): Annual variations of T/ET in a semi-arid region: Implications of plant water use strategies

Arid

DOI	10.1016/j.jhydrol.2021.126884
	Annual variations of T/ET in a semi-arid region: Implications of plant water use strategies
	Yuan, Ruiqiang; Chang, Liling; Niu, Guoyue
通讯作者	Yuan, RQ (corresponding author), Shanxi Univ, Sch Environm & Resource, Taiyuan, Peoples R China.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	603
英文摘要	Understanding the annual variation in the transpiration to evapotranspiration ratio (T/ET) remains a challenge and is essential for a thorough understanding of plant responses to the changing environment. We obtained the annual dynamics of T/ET in a semi-arid area of the southwestern United States based on the medians of monthly T/ET derived from two ET partitioning methods. The variation in monthly T/ET was analysed, and plant water use strategies were discussed based on the water use efficiency evaluated by the transpiration (WUE_T). The results show that physiological changes in plants are vital in the annual dynamics of T/ET. Switches in plant physiological status (growth and dormancy) at the start and end of growing seasons induce two dramatic changes in T/ET. Consequently, there is an annual bimodal dynamic of monthly T/ET, with a maximum of 0.84 in October and a minimum of 0.14 in December. Physiological/biochemical variations of plants indicated by solar-induced chlorophyll fluorescence (SIF) are linearly related to T/ET in growing seasons at a monthly scale (T/ET = 3.40 x SIF + 0.36, R-2 = 0.987). Generally, a stable high monthly T/ET occurs under sufficient energy and water conditions and a highly variable monthly T/ET occurs under energy and water deficient conditions. In semi-arid regions, plants can flexibly adjust WUE_T following different water use strategies to survive or gain as much gross primary productivity (GPP) to compete. Saving water by greatly elevating WUE_T is the main strategy by which plants survive the non-growing season when WUE _T is linearly related to SIF (WUE_T = -114.93 x SIF 3.25, R-2 = 0.970). However, GPP and not WUE-T, becomes the goal of plants in growing seasons when they employ a stable and moderate WUE_T (around 2.1 gC kg(-1)H(2)O) despite the abundant energy and precipitation. There are obvious reductions in WUE_T during the transition periods of the plants' growth-dormancy' cycle. Our study highlights the importance of studying annual T/ET variations and water-use efficiency dynamics to better understand water use strategies in plants.
英文关键词	Transpiration Leaf scale WUE Water use strategies Plant Adaption Changing environment
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000706318300002
WOS关键词	NET ECOSYSTEM EXCHANGE ; CARBON-DIOXIDE ; PRECIPITATION VARIABILITY ; CHLOROPHYLL FLUORESCENCE ; DRYLAND ECOSYSTEMS ; USE EFFICIENCY ; EVAPOTRANSPIRATION ; RESPIRATION ; TRANSPIRATION ; PHOTOSYNTHESIS
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363930
作者单位	[Yuan, Ruiqiang] Shanxi Univ, Sch Environm & Resource, Taiyuan, Peoples R China; [Yuan, Ruiqiang] Shanxi Lab Yellow River, Taiyuan, Peoples R China; [Yuan, Ruiqiang; Chang, Liling; Niu, Guoyue] Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ USA
推荐引用方式 GB/T 7714	Yuan, Ruiqiang,Chang, Liling,Niu, Guoyue. Annual variations of T/ET in a semi-arid region: Implications of plant water use strategies[J]. University of Arizona,2021,603.
APA	Yuan, Ruiqiang,Chang, Liling,&Niu, Guoyue.(2021).Annual variations of T/ET in a semi-arid region: Implications of plant water use strategies.JOURNAL OF HYDROLOGY,603.
MLA	Yuan, Ruiqiang,et al."Annual variations of T/ET in a semi-arid region: Implications of plant water use strategies".JOURNAL OF HYDROLOGY 603(2021).