Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/j.1365-2486.2009.01966.x |
Physiological and environmental regulation of interannual variability in CO2 exchange on rangelands in the western United States | |
Polley, H. Wayne1; Emmerich, William2; Bradford, James A.3; Sims, Phillip L.3; Johnson, Douglas A.4; Saliendra, Nicanor Z.5; Svejcar, Tony6; Angell, Raymond6; Frank, Albert B.7; Phillips, Rebecca L.7; Snyder, Keirith A.8; Morgan, Jack A.9 | |
通讯作者 | Polley, H. Wayne |
来源期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2010 |
卷号 | 16期号:3页码:990-1002 |
英文摘要 | For most ecosystems, net ecosystem exchange of CO2 (NEE) varies within and among years in response to environmental change. We analyzed measurements of CO2 exchange from eight native rangeland ecosystems in the western United States (58 site-years of data) in order to determine the contributions of photosynthetic and respiratory (physiological) components of CO2 exchange to environmentally caused variation in NEE. Rangelands included Great Plains grasslands, desert shrubland, desert grasslands, and sagebrush steppe. We predicted that (1) week-to-week change in NEE and among-year variation in the response of NEE to temperature, net radiation, and other environmental drivers would be better explained by change in maximum rates of ecosystem photosynthesis (A(max)) than by change in apparent light-use efficiency (alpha) or ecosystem respiration at 10 degrees C (R-10) and (2) among-year variation in the responses of NEE, A(max), and alpha to environmental drivers would be explained by changes in leaf area index (LAI). As predicted, NEE was better correlated with A(max) than alpha or R-10 for six of the eight rangelands. Week-to-week variation in NEE and physiological parameters correlated mainly with time-lagged indices of precipitation and water-related environmental variables, like potential evapotranspiration, for desert sites and with net radiation and temperature for Great Plains grasslands. For most rangelands, the response of NEE to a given change in temperature, net radiation, or evaporative demand differed among years because the response of photosynthetic parameters (A(max), alpha) to environmental drivers differed among years. Differences in photosynthetic responses were not explained by variation in LAI alone. A better understanding of controls on canopy photosynthesis will be required to predict variation in NEE of rangeland ecosystems. |
英文关键词 | climatic variability desert functional change grassland leaf area light-use efficiency net ecosystem exchange of CO2 precipitation respiration shrubland |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000274419500008 |
WOS关键词 | NET ECOSYSTEM EXCHANGE ; CARBON-DIOXIDE FLUXES ; WATER-VAPOR ; LONG-TERM ; USE EFFICIENCY ; BOWEN-RATIO ; RESPIRATION ; BALANCE ; GRASSLAND ; PRAIRIE |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/164394 |
作者单位 | 1.ARS, USDA, Grassland Soil & Water Res Lab, Temple, TX 76502 USA; 2.ARS, USDA, Tucson, AZ 85719 USA; 3.ARS, USDA, Woodward, OK 73801 USA; 4.ARS, USDA, Logan, UT 84322 USA; 5.US Forest Serv, Rhinelander, WI 54501 USA; 6.ARS, USDA, Burns, OR 97720 USA; 7.ARS, USDA, Mandan, ND 58554 USA; 8.ARS, USDA, Reno, NV 89512 USA; 9.ARS, USDA, Ft Collins, CO 80526 USA |
推荐引用方式 GB/T 7714 | Polley, H. Wayne,Emmerich, William,Bradford, James A.,et al. Physiological and environmental regulation of interannual variability in CO2 exchange on rangelands in the western United States[J],2010,16(3):990-1002. |
APA | Polley, H. Wayne.,Emmerich, William.,Bradford, James A..,Sims, Phillip L..,Johnson, Douglas A..,...&Morgan, Jack A..(2010).Physiological and environmental regulation of interannual variability in CO2 exchange on rangelands in the western United States.GLOBAL CHANGE BIOLOGY,16(3),990-1002. |
MLA | Polley, H. Wayne,et al."Physiological and environmental regulation of interannual variability in CO2 exchange on rangelands in the western United States".GLOBAL CHANGE BIOLOGY 16.3(2010):990-1002. |
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