干旱区生态环境知识资源中心(Arid): Water Availability Impacts on Evapotranspiration Partitioning

Arid

DOI	10.1016/j.agrformet.2020.108251
	Water Availability Impacts on Evapotranspiration Partitioning
	Scott, Russell L.; Knowles, John F.; Nelson, Jacob A.; Gentine, Pierre; Li, Xi; Barron-Gafford, Greg; Bryant, Ross; Biederman, Joel A.
通讯作者	Scott, RL (corresponding author), USDA ARS, 2000 E Allen Rd, Tucson, AZ 85719 USA.
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2021
卷号	297
英文摘要	Knowing how evapotranspiration (ET) is mediated by abiotic and biotic pathways is essential to understanding how water affects ecosystem productivity. Recent studies have investigated the average transpiration fraction (T/ET) across sites and biomes, but the temporal variability of the partitioning and its controls are less understood. Here, we examine how water availability may regulate the seasonal to interannual variability of ET partitioning. To do this, we leveraged four partitioning techniques and long-term (14 years) eddy-flux records from a semiarid grassland and riparian woodland site in southeastern Arizona USA that share the same climate but differ in water table depth. T/ET was sensitive to changes in water availability over space and time as evidenced by consistently lower and more variable T/ET at the grassland, where the vegetation does not access groundwater. Seasonally, a pronounced dry foresummer T/ET depression at the rainfall-dependent grassland resulted in a bimodal T/ET distribution. In contrast, T/ET was unimodally distributed at the groundwater-dependent woodland, where high T/ET levels were maintained throughout both the dry and wet summer periods. Annual transpiration at both sites closely tracked water availability as quantified by ET, whereas abiotic evaporation was nearly constant. All ET partitioning methods yielded similar patterns of seasonal and interannual T/ET, although they differed by approximately 5 to 10% in magnitude. At both sites, transpiration was most closely correlated to plant metrics (photosynthesis, leaf area index) and ET, whereas evaporation was most correlated to surface moisture variables (soil moisture, precipitation). However, substantial differences between monthly and annual correlations demonstrate variable controls on monthly partitioning throughout the year. These results provide novel insights into the effects of water availability on the seasonal and interannual variability of ET partitioning and illuminate mechanisms regulating terrestrial ecosystem carbon and water exchange.
英文关键词	Transpiration Eddy covariance Productivity Water use efficiency Semiarid Grassland Groundwater Riparian woodland
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000608676000017
WOS关键词	CARBON-DIOXIDE EXCHANGE ; NET ECOSYSTEM EXCHANGE ; VAPOR-PRESSURE DEFICIT ; USE EFFICIENCY ; EDDY-COVARIANCE ; SOIL-WATER ; STOMATAL CONDUCTANCE ; SEMIARID ECOSYSTEMS ; CHIHUAHUAN DESERT ; TRANSPIRATION
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
来源机构	北京大学 ; University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347626
作者单位	[Scott, Russell L.; Knowles, John F.; Bryant, Ross; Biederman, Joel A.] USDA ARS, Southwest Watershed Res Ctr, Tucson, AZ 85719 USA; [Nelson, Jacob A.] Max Planck Inst Biogeochem, Dept Biogeochem Integrat, Jena, Germany; [Gentine, Pierre] Columbia Univ, Dept Earth & Environm Engn, New York, NY 10027 USA; [Li, Xi] Peking Univ, Coll Engn, Inst Water Sci, Beijing 100871, Peoples R China; [Barron-Gafford, Greg] Univ Arizona, Sch Geog Dev & Environm, Tucson, AZ 85721 USA
推荐引用方式 GB/T 7714	Scott, Russell L.,Knowles, John F.,Nelson, Jacob A.,et al. Water Availability Impacts on Evapotranspiration Partitioning[J]. 北京大学, University of Arizona,2021,297.
APA	Scott, Russell L..,Knowles, John F..,Nelson, Jacob A..,Gentine, Pierre.,Li, Xi.,...&Biederman, Joel A..(2021).Water Availability Impacts on Evapotranspiration Partitioning.AGRICULTURAL AND FOREST METEOROLOGY,297.
MLA	Scott, Russell L.,et al."Water Availability Impacts on Evapotranspiration Partitioning".AGRICULTURAL AND FOREST METEOROLOGY 297(2021).