干旱区生态环境知识资源中心(Arid): Seasonal variations in energy exchange and evapotranspiration of an oasis-desert ecotone in an arid region

Arid

DOI	10.1002/hyp.14364
	Seasonal variations in energy exchange and evapotranspiration of an oasis-desert ecotone in an arid region
	Ji, Xibin; Zhao, Wenzhi; Jin, Bowen; Liu, Jane; Xu, Feinan; Zhou, Hai
通讯作者	Ji, XB (corresponding author), Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, 320 Donggang West Rd, Lanzhou 730000, Peoples R China.
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2021
卷号	35 期号:9
英文摘要	Knowledge of exchanges of energy and water over terrestrial surfaces is the first step towards understand the ecohydrological mechanisms, particularly in water-limited ecosystems in dryland environments. However, patterns of energy exchange and evapotranspiration (ET) are not well understood in the oasis-desert ecotone, which plays an important role in protecting oases against the threat of desertification in arid regions of northwestern China. Here, the continuous measurements of surface energy fluxes were made using eddy covariance in conjunction with auxiliary measurements for 2 years (2014-2015) in an oasis-desert ecotone mainly covered by phreatophyte shrubs Haloxylon ammodendron, Nitraria tangutorum/sphaerocarpa, and Calligonum mongolicum in arid northwestern China. Based on the collated data for 2 years, statistical analysis on a 30-min time scale indicated that approximately 50% of daytime net radiation (R-n) in the ecotone was dissipated as H on average, and one-third of R-n was consumed by soil heat flux (G). Only 9% of R-n was consumed for latent heat flux (lambda E), which peaked in summer (21% in 2014 and 16% in 2015), corresponding to the highest rainfall season. Daily mean ET was approximately 1 mm days(-1) during the growing season of the shrub species. Accumulated annual ET was 195 and 181 mm in 2014 and 2015, respectively, exceeding the corresponding precipitation (P) by approximately 87 and 77 mm, indicating that groundwater may be another important source of water for ET in the ecotone aside from rainfall. Results within provide valuable insights into the mechanisms responsible for sustaining energy and water balance in the ecotone, a potentially groundwater-dependent ecosystem. These results also offer a foremost ecohydrological implication for water and land resources management and ecotone conservation, such as avoiding heavy groundwater pumping for extensive agricultural irrigation use to sustain groundwater availability for these shrub species in the ecotone.
英文关键词	energy exchange evapotranspiration groundwater Hexi corridor of Northwest China phreatophyte shrubs precipitation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000700789300030
WOS关键词	GROUNDWATER-DEPENDENT ECOSYSTEMS ; BALANCE CLOSURE ; FLUX MEASUREMENTS ; FIELD EXPERIMENT ; CARBON-DIOXIDE ; WATER-VAPOR ; RIVER-BASIN ; LAND ; HEAT ; DESERTIFICATION
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363538
作者单位	[Ji, Xibin; Zhao, Wenzhi; Jin, Bowen; Zhou, Hai] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol & Watershed Sci, Linze Inland River Basin Res Stn, Lanzhou, Peoples R China; [Liu, Jane] Fujian Normal Univ, Sch Geog Sci, Lab Humid Subtrop Ecogeog Proc, Minist Educ, Fuzhou, Peoples R China; [Liu, Jane] Univ Toronto, Dept Geog & Planning, Toronto, ON, Canada; [Xu, Feinan] Chinese Acad Sci, Northwest Inst Eco Environm & Resources, Key Lab Remote Sensing Gansu Prov, Heihe Remote Sensing Expt Res Stn, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Ji, Xibin,Zhao, Wenzhi,Jin, Bowen,et al. Seasonal variations in energy exchange and evapotranspiration of an oasis-desert ecotone in an arid region[J],2021,35(9).
APA	Ji, Xibin,Zhao, Wenzhi,Jin, Bowen,Liu, Jane,Xu, Feinan,&Zhou, Hai.(2021).Seasonal variations in energy exchange and evapotranspiration of an oasis-desert ecotone in an arid region.HYDROLOGICAL PROCESSES,35(9).
MLA	Ji, Xibin,et al."Seasonal variations in energy exchange and evapotranspiration of an oasis-desert ecotone in an arid region".HYDROLOGICAL PROCESSES 35.9(2021).