Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13686 |
CO2 exchange and evapotranspiration across dryland ecosystems of southwestern North America | |
Biederman, Joel A.1; Scott, Russell L.1; Bell, Tom W.2; Bowling, David R.3; Dore, Sabina4; Garatuza-Payan, Jaime5; Kolb, Thomas E.4; Krishnan, Praveena6; Krofcheck, Dan J.7; Litvak, Marcy E.7; Maurer, Gregory E.7; Meyers, Tilden P.6; Oechel, Walter C.8,9; Papuga, Shirley A.10; Ponce-Campos, Guillermo E.1; Rodriguez, Julio C.11; Smith, William K.10; Vargas, Rodrigo12; Watts, Christopher J.13; Yepez, Enrico A.5; Goulden, Michael L.14 | |
2017-10-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Mexico; England |
英文摘要 | 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 degrees 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 similar to 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. |
英文关键词 | climate moderate resolution imaging spectroradiometer net ecosystem exchange photosynthesis remote sensing respiration semiarid water |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000410642100020 |
WOS关键词 | GROSS PRIMARY PRODUCTIVITY ; CARBON-DIOXIDE EXCHANGE ; SEMIARID ECOSYSTEMS ; INTERANNUAL VARIABILITY ; TERRESTRIAL CARBON ; CHLOROPHYLL FLUORESCENCE ; SOIL RESPIRATION ; SPATIAL-PATTERNS ; EUROPEAN FORESTS ; BAJA-CALIFORNIA |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17780 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.ARS, Southwest Watershed Res Ctr, Tucson, AZ USA; 2.Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USA; 3.Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA; 4.No Arizona Univ, Merriam Powell Ctr Environm Res, Sch Forestry, Flagstaff, AZ USA; 5.Inst Tecnol Sonora, Dept Ciencias Agua & Medio Ambiente, Obregon, Sonora, Mexico; 6.NOAA, Atmospher Turbulence & Diffus Div, Air Resources Lab, Oak Ridge, TN USA; 7.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA; 8.San Diego State Univ, Dept Biol, Global Change Res Grp, San Diego, CA 92182 USA; 9.Coll Life & Environm Sci, Dept Geog, Exeter, Devon, England; 10.Univ Arizona, Sch Nat Resources & Environm, Tucson, AZ USA; 11.Univ Sonora, Dept Agr & Ganaderia, Hermosillo, Sonora, Mexico; 12.Univ Delaware, Dept Plant & Soil Sci, Newark, DE 19717 USA; 13.Univ Sonora, Dept Fis, Hermosillo, Sonora, Mexico; 14.Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA USA |
推荐引用方式 GB/T 7714 | Biederman, Joel A.,Scott, Russell L.,Bell, Tom W.,et al. CO2 exchange and evapotranspiration across dryland ecosystems of southwestern North America[J]. GLOBAL CHANGE BIOLOGY,2017,23(10). |
APA | Biederman, Joel A..,Scott, Russell L..,Bell, Tom W..,Bowling, David R..,Dore, Sabina.,...&Goulden, Michael L..(2017).CO2 exchange and evapotranspiration across dryland ecosystems of southwestern North America.GLOBAL CHANGE BIOLOGY,23(10). |
MLA | Biederman, Joel A.,et al."CO2 exchange and evapotranspiration across dryland ecosystems of southwestern North America".GLOBAL CHANGE BIOLOGY 23.10(2017). |
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