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DOI | 10.1029/2018JG004666 |
Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem | |
Missik, Justine E. C.1; Liu, Heping1; Gao, Zhongming1; Huang, Maoyi2; Chen, Xingyuan2; Arntzen, Evan2; Mcfarland, Douglas P.2; Ren, Huiying2; Titzler, P. Scott2; Thomle, Jonathan N.2; Goldman, Amy2 | |
发表日期 | 2019 |
ISSN | 2169-8953 |
EISSN | 2169-8961 |
卷号 | 124期号:1页码:99-114 |
英文摘要 | Semiarid ecosystems play a critical role in determining the interannual variability of the global terrestrial carbon sink. Water availability is a critical driver of productivity in semiarid ecosystems, which often alternate between carbon sink/source functioning during wet/dry years. In this study, we investigate how groundwater availability resulting from groundwater-river water exchange influences net ecosystem exchange of CO2 (NEE), evapotranspiration (ET), and the surface energy balance at two semiarid ecosystems along the Columbia River in central Washington, USA. We examined 1year of eddy covariance measurements from an upland sagebrush ecosystem primarily fed by rainfall without groundwater access and a riparian grassland ecosystem with groundwater access during the dry season due to lateral groundwater-river water exchange. The two sites had distinct seasonal patterns of NEE and ET, driven by differences in water availability. While NEE at the upland sagebrush site was strongly constrained by water availability during the dry months, access to groundwater allowed the riparian site to maintain high NEE magnitude and ET during the same dry months. The riparian site had larger annual gross primary productivity than the upland site (612 vs. 424 gC/m(2)), which was offset by higher ecosystem respiration (558 vs.363 gC/m(2)). Thus, the magnitude of the annual NEE at the upland site was larger than that at the riparian site (-62 vs. -54 gC/m(2)). Our results demonstrate that groundwater access determined by connectivity between groundwater and surface water can be a critical driver of carbon uptake and ET in semiarid ecosystems. |
WOS研究方向 | Environmental Sciences & Ecology ; Geology |
来源期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
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文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/90625 |
作者单位 | 1.Washington State Univ, Dept Civil & Environm Engn, Lab Atmospher Res, Pullman, WA 99164 USA; 2.Pacific Northwest Natl Lab, Richland, WA USA |
推荐引用方式 GB/T 7714 | Missik, Justine E. C.,Liu, Heping,Gao, Zhongming,et al. Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem[J],2019,124(1):99-114. |
APA | Missik, Justine E. C..,Liu, Heping.,Gao, Zhongming.,Huang, Maoyi.,Chen, Xingyuan.,...&Goldman, Amy.(2019).Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,124(1),99-114. |
MLA | Missik, Justine E. C.,et al."Groundwater-River Water Exchange Enhances Growing Season Evapotranspiration and Carbon Uptake in a Semiarid Riparian Ecosystem".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 124.1(2019):99-114. |
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