CO2 exchange and evapotranspiration across dryland ecosystems of southwestern North America

CO2 exchange and evapotranspiration across dryland ecosystems of southwestern North America

Published 2017. This article is a U.S. Government work and is in the public domain in the USA.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 23(2017), 10 vom: 20. Okt., Seite 4204-4221
1. Verfasser: Biederman, Joel A (VerfasserIn)
Weitere Verfasser: Scott, Russell L, Bell, Tom W, Bowling, David R, Dore, Sabina, Garatuza-Payan, Jaime, Kolb, Thomas E, Krishnan, Praveena, Krofcheck, Dan J, Litvak, Marcy E, Maurer, Gregory E, Meyers, Tilden P, Oechel, Walter C, Papuga, Shirley A, Ponce-Campos, Guillermo E, Rodriguez, Julio C, Smith, William K, Vargas, Rodrigo, Watts, Christopher J, Yepez, Enrico A, Goulden, Michael L
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2017
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article climate moderate resolution imaging spectroradiometer net ecosystem exchange photosynthesis remote sensing respiration semiarid water Carbon Dioxide 142M471B3J
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245 1 0 |a CO2 exchange and evapotranspiration across dryland ecosystems of southwestern North America 
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500 |a Date Completed 23.10.2017 
500 |a Date Revised 02.12.2018 
500 |a published: Print-Electronic 
500 |a Citation Status MEDLINE 
520 |a Published 2017. This article is a U.S. Government work and is in the public domain in the USA. 
520 |a Global-scale studies suggest that dryland ecosystems dominate an increasing trend in the magnitude and interannual variability of the land CO2 sink. However, such analyses are poorly constrained by measured CO2 exchange in drylands. Here we address this observation gap with eddy covariance data from 25 sites in the water-limited Southwest region of North America with observed ranges in annual precipitation of 100-1000 mm, annual temperatures of 2-25°C, and records of 3-10 years (150 site-years in total). Annual fluxes were integrated using site-specific ecohydrologic years to group precipitation with resulting ecosystem exchanges. We found a wide range of carbon sink/source function, with mean annual net ecosystem production (NEP) varying from -350 to +330 gCm-2 across sites with diverse vegetation types, contrasting with the more constant sink typically measured in mesic ecosystems. In this region, only forest-dominated sites were consistent carbon sinks. Interannual variability of NEP, gross ecosystem production (GEP), and ecosystem respiration (Reco ) was larger than for mesic regions, and half the sites switched between functioning as C sinks/C sources in wet/dry years. The sites demonstrated coherent responses of GEP and NEP to anomalies in annual evapotranspiration (ET), used here as a proxy for annually available water after hydrologic losses. Notably, GEP and Reco were negatively related to temperature, both interannually within site and spatially across sites, in contrast to positive temperature effects commonly reported for mesic ecosystems. Models based on MODIS satellite observations matched the cross-site spatial pattern in mean annual GEP but consistently underestimated mean annual ET by ~50%. Importantly, the MODIS-based models captured only 20-30% of interannual variation magnitude. These results suggest the contribution of this dryland region to variability of regional to global CO2 exchange may be up to 3-5 times larger than current estimates 
650 4 |a Journal Article 
650 4 |a climate 
650 4 |a moderate resolution imaging spectroradiometer 
650 4 |a net ecosystem exchange 
650 4 |a photosynthesis 
650 4 |a remote sensing 
650 4 |a respiration 
650 4 |a semiarid 
650 4 |a water 
650 7 |a Carbon Dioxide  |2 NLM 
650 7 |a 142M471B3J  |2 NLM 
700 1 |a Scott, Russell L  |e verfasserin  |4 aut 
700 1 |a Bell, Tom W  |e verfasserin  |4 aut 
700 1 |a Bowling, David R  |e verfasserin  |4 aut 
700 1 |a Dore, Sabina  |e verfasserin  |4 aut 
700 1 |a Garatuza-Payan, Jaime  |e verfasserin  |4 aut 
700 1 |a Kolb, Thomas E  |e verfasserin  |4 aut 
700 1 |a Krishnan, Praveena  |e verfasserin  |4 aut 
700 1 |a Krofcheck, Dan J  |e verfasserin  |4 aut 
700 1 |a Litvak, Marcy E  |e verfasserin  |4 aut 
700 1 |a Maurer, Gregory E  |e verfasserin  |4 aut 
700 1 |a Meyers, Tilden P  |e verfasserin  |4 aut 
700 1 |a Oechel, Walter C  |e verfasserin  |4 aut 
700 1 |a Papuga, Shirley A  |e verfasserin  |4 aut 
700 1 |a Ponce-Campos, Guillermo E  |e verfasserin  |4 aut 
700 1 |a Rodriguez, Julio C  |e verfasserin  |4 aut 
700 1 |a Smith, William K  |e verfasserin  |4 aut 
700 1 |a Vargas, Rodrigo  |e verfasserin  |4 aut 
700 1 |a Watts, Christopher J  |e verfasserin  |4 aut 
700 1 |a Yepez, Enrico A  |e verfasserin  |4 aut 
700 1 |a Goulden, Michael L  |e verfasserin  |4 aut 
773 0 8 |i Enthalten in  |t Global change biology  |d 1999  |g 23(2017), 10 vom: 20. Okt., Seite 4204-4221  |w (DE-627)NLM098239996  |x 1365-2486  |7 nnns 
773 1 8 |g volume:23  |g year:2017  |g number:10  |g day:20  |g month:10  |g pages:4204-4221 
856 4 0 |u http://dx.doi.org/10.1111/gcb.13686  |3 Volltext 
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