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Contrasting precipitation seasonality influences evapotranspiration dynamics in water-limited shrublands
Villarreal, Samuel; Vargas, Rodrigo; Yepez, Enrico A.; Acosta, Jose S.; Castro, Angel; Escoto-Rodriguez, Martin; Lopez, Eulogio; Martinez-Osuna, Juan; Rodriguez, Julio C.; Smith, Stephen V.; Vivoni, Enrique R.; Watts, Christopher J.
2016
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
Volume121Issue:2Pages:494-508
AbstractWater-limited ecosystems occupy nearly 30% of the Earth, but arguably, the controls on their ecosystem processes remain largely uncertain. We analyzed six site years of eddy covariance measurements of evapotranspiration (ET) from 2008 to 2010 at two water-limited shrublands: one dominated by winter precipitation (WP site) and another dominated by summer precipitation (SP site), but with similar solar radiation patterns in the Northern Hemisphere. We determined how physical forcing factors (i.e., net radiation (R-n), soil water content (SWC), air temperature (T-a), and vapor pressure deficit (VPD)) influence annual and seasonal variability of ET. Mean annual ET at SP site was 45591mmyr(-1), was mainly influenced by SWC during the dry season, by R-n during the wet season, and was highly sensitive to changes in annual precipitation (P). Mean annual ET at WP site was 36352mmyr(-1), had less interannual variability, but multiple variables (i.e., SWC, T-a, VPD, and R-n) were needed to explain ET among years and seasons. Wavelet coherence analysis showed that ET at SP site has a consistent temporal coherency with T-a and P, but this was not the case for ET at WP site. Our results support the paradigm that SWC is the main control of ET in water-limited ecosystems when radiation and temperature are not the limiting factors. In contrast, when P and SWC are decoupled from available energy (i.e., radiation and temperature), then ET is controlled by an interaction of multiple variables. Our results bring attention to the need for better understanding how climate and soil dynamics influence ET across these globally distributed ecosystems.
KeywordNorth-american Monsoon Soil Co2 Efflux Energy-balance Closure Central New-mexico Semiarid Ecosystems Mediterranean-climate Vegetation Dynamics Baja-california Carbon-cycle Moisture
Subject AreaEnvironmental Sciences & Ecology ; Geology
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/9744
Collection文献共享
Recommended Citation
GB/T 7714
Villarreal, Samuel,Vargas, Rodrigo,Yepez, Enrico A.,et al. Contrasting precipitation seasonality influences evapotranspiration dynamics in water-limited shrublands[J]. JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,2016,121(2):494-508.
APA Villarreal, Samuel.,Vargas, Rodrigo.,Yepez, Enrico A..,Acosta, Jose S..,Castro, Angel.,...&Watts, Christopher J..(2016).Contrasting precipitation seasonality influences evapotranspiration dynamics in water-limited shrublands.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,121(2),494-508.
MLA Villarreal, Samuel,et al."Contrasting precipitation seasonality influences evapotranspiration dynamics in water-limited shrublands".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 121.2(2016):494-508.
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