干旱区生态环境知识资源中心(Arid): Summer-Time Carbon and Water Fluxes in Sagebrush Ecosystems Spanning Rain- to Snow-Dominated Precipitation Regimes

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DOI	10.1016/j.rama.2019.11.002
	Summer-Time Carbon and Water Fluxes in Sagebrush Ecosystems Spanning Rain- to Snow-Dominated Precipitation Regimes
	Sharma, Harmandeep 1,2; Reinhardt, Keith 1; Lohse, Kathleen A.1; Aho, Ken 1
通讯作者	Sharma, Harmandeep
来源期刊	RANGELAND ECOLOGY & MANAGEMENT
ISSN	1550-7424
EISSN	1551-5028
出版年	2020
卷号	73 期号:2 页码:265-275
英文摘要	Sagebrush ecosystems consist of different communities of species and subspecies of sagebrush marked by distinct ecotones along elevation gradients, yet few studies have quantified how ecosystem-scale carbon dioxide (net ecosystem exchange, NEE) and water fluxes (evapotranspiration, ET), as well as their environmental drivers, vary among communities dominated by different sub/species of sagebrush at daily and seasonal time scales. To address this knowledge gap, we measured daytime (6 a.m.-6 p.m.) NEE and ET using a tent chamber and associated environmental drivers in three sagebrush communities spanning an elevation gradient of 1 425-2 111 m at the Reynolds Creek Critical Zone Observatory in southwestern Idaho. Daytime NEE and ET were greatest at the highest elevation (snow-dominated) site during the study period except NEE in June. By late summer, NEE declined by > 80% at the lower (rain-dominated) sites but only 50% at the highest site, compared with maximal values in June. In contrast, ET declined similar to 95% in late summer compared with June at all three sites. Ecosystem-scale NEE and ET were mainly controlled by soil moisture and vapor pressure deficit at the rain-dominated sites and by deep soil moisture and air temperature at the snow-dominated site. Cumulative (June-August) modeled daytime NEE was greatest at the midelevation site, whereas cumulative daytime ET was greatest at the highest-elevation site. Ecosystem models often assume that sagebrush landscapes are homogeneous and do not differ in fluxes and controls, yet our data demonstrate that there are fundamental differences in CO2 and water fluxes and their controls among different shrub communities that should be accounted for in these models. (C) 2019 The Society for Range Management. Published by Elsevier Inc. All rights reserved.
英文关键词	Artemisia arbuscula Artemisia tridentata evapotranspiration net ecosystem exchange semiarid
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000519928400009
WOS关键词	ARTEMISIA-TRIDENTATA ; CO2 FLUXES ; NET ECOSYSTEM ; SOIL ; EXCHANGE ; DESERT ; RESPONSES ; PHOTOSYNTHESIS ; COMMUNITY ; DROUGHT
WOS类目	Ecology ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315395
作者单位	1.Idaho State Univ, Dept Biol Sci, 650 Mem Dr, Pocatello, ID 83209 USA; 2.North Carolina Agr & Tech State Univ, Dept Nat Resources & Environm Design, Greensboro, NC 27411 USA
推荐引用方式 GB/T 7714	Sharma, Harmandeep,Reinhardt, Keith,Lohse, Kathleen A.,et al. Summer-Time Carbon and Water Fluxes in Sagebrush Ecosystems Spanning Rain- to Snow-Dominated Precipitation Regimes[J],2020,73(2):265-275.
APA	Sharma, Harmandeep,Reinhardt, Keith,Lohse, Kathleen A.,&Aho, Ken.(2020).Summer-Time Carbon and Water Fluxes in Sagebrush Ecosystems Spanning Rain- to Snow-Dominated Precipitation Regimes.RANGELAND ECOLOGY & MANAGEMENT,73(2),265-275.
MLA	Sharma, Harmandeep,et al."Summer-Time Carbon and Water Fluxes in Sagebrush Ecosystems Spanning Rain- to Snow-Dominated Precipitation Regimes".RANGELAND ECOLOGY & MANAGEMENT 73.2(2020):265-275.