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title: Contrasting precipitation seasonality influences evapotranspiration dynamics in water-limited shrublands
author: 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.
Issued Date: 2016
Subject: Environmental Sciences & Ecology;  Geology
Abstract: Water-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.
Related URLs: 10.1002/2015JG003169
Indexed Type: SCI
Content Type: 期刊论文
ISSN: 2169-8953
Appears in Collections:文献共享_期刊论文

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Recommended Citation:
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.

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