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DOI10.1111/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
ISSN1354-1013
EISSN1365-2486
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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