气候变化领域集成服务门户(CCPortal): Seasonal variations in energy exchange and evapotranspiration of an oasis-desert ecotone in an arid region

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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 (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, 320 Donggang West Rd, Lanzhou 730000, Peoples R China.
发表日期	2021
ISSN	0885-6087
EISSN	1099-1085
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.
关键词	GROUNDWATER-DEPENDENT ECOSYSTEMS BALANCE CLOSURE FLUX MEASUREMENTS FIELD EXPERIMENT CARBON-DIOXIDE WATER-VAPOR RIVER-BASIN LAND HEAT DESERTIFICATION
英文关键词	energy exchange; evapotranspiration; groundwater; Hexi corridor of Northwest China; phreatophyte shrubs; precipitation
语种	英语
WOS研究方向	Water Resources
WOS类目	Water Resources
WOS记录号	WOS:000700789300030
来源期刊	HYDROLOGICAL PROCESSES
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253930
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]. 中国科学院西北生态环境资源研究院,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).