Arid
DOI10.2111/REM-D-09-00015.1
Precipitation Regulates the Response of Net Ecosystem CO2 Exchange to Environmental Variation on United States Rangelands
Polley, H. Wayne1; Emmerich, William2; Bradford, James A.; Sims, Phillip L.3; Johnson, Douglas A.4; Sallendra, Nicanor Z.5; Svejcar, Tony6; Angell, Raymond6; Frank, Albert B.7; Phillips, Rebecca L.7; Snyder, Keirith A.8; Morgan, Jack A.9; Sanabria, Joaquin10; Mielnick, Patricia C.11; Dugas, William A.11
通讯作者Polley, H. Wayne
来源期刊RANGELAND ECOLOGY & MANAGEMENT
ISSN1550-7424
EISSN1551-5028
出版年2010
卷号63期号:2页码:176-186
英文摘要

Rangelands occupy 50% of Earth’s land surface and thus are important in the terrestrial carbon (C) cycle. For rangelands and other terrestrial ecosystems, the balance between photosynthetic uptake of carbon dioxide (CO2) and CO2 loss to respiration varies among years in response to interannual variation in the environment. Variability in CO2 exchange results from interannual differences in 1) environmental variables at a given point in the annual cycle (direct effects of the environment) and in 2) the response Of fluxes to a given change in the environment because of interannual changes in biological factors that regulate photosynthesis and respiration (functional change). Functional change is calculated as the contribution of among-year differences in slopes Of flux-environment relationships to the total variance in fluxes explained by the environment. Functional change complicates environmental-based predictions Of CO2 exchange, yet its causes and contribution to flux variability remain poorly defined. We determine contributions Of functional change and direct effects of the environment to interannual variation in net ecosystem exchange of CO2 (NEE) of eight rangeland ecosystems in the western United States (58 site-years of data). We predicted that 1) functional change is correlated with interannual change in precipitation on each rangeland and 2) the contribution of functional change to variance in NEE increases among rangelands as mean precipitation increases. Functional change explained 10-40% of the variance in NEE and accounted for more than twice the variance in fluxes of direct effects of environmental variability for six of the eight ecosystems. Functional change was associated with interannual variation in precipitation on most rangelands but, contrary to prediction, contributed proportionally more to variance in NEE on and than more mesic ecosystems. Results indicate that we must account for the influence of precipitation on flux-environment relationships if we are to distinguish environmental from management effects on rangeland C balance.


英文关键词climatic variability deserts functional change grasslands shrublands variability in carbon flux
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000275970000002
WOS关键词CARBON-DIOXIDE FLUXES ; MIXED-GRASS PRAIRIE ; LONG-TERM ; INTERANNUAL VARIABILITY ; USE EFFICIENCY ; BOWEN-RATIO ; NORTHERN ; STEPPE ; VEGETATION ; BALANCE
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/166204
作者单位1.USDA ARS, Grassland Soil & Water Res Lab, Temple, TX 76502 USA;
2.USDA ARS, SW Watershed Res Ctr, Tucson, AZ 85719 USA;
3.USDA ARS, So Plains Range Res Stn, Woodward, OK 73801 USA;
4.Utah State Univ, USDA ARS, Forage & Range Res Lab, Logan, UT 84322 USA;
5.US Forest Serv, Inst Appl Ecosyst Studies, Rhinelander, WI 54501 USA;
6.USDA ARS, Eastern Oregon Agr Res Ctr, Burns, OR 97720 USA;
7.USDA ARS, No Great Plains Res Lab, Mandan, ND 58554 USA;
8.USDA ARS, Reno, NV 89512 USA;
9.USDA ARS, Crops Res Lab, Ft Collins, CO 80526 USA;
10.Int Fertilizer Dev Ctr, Muscle Shoals, AL 35662 USA;
11.Texas AgriLife Res, Blackland Res & Extens Ctr, Temple, TX 76502 USA
推荐引用方式
GB/T 7714
Polley, H. Wayne,Emmerich, William,Bradford, James A.,et al. Precipitation Regulates the Response of Net Ecosystem CO2 Exchange to Environmental Variation on United States Rangelands[J],2010,63(2):176-186.
APA Polley, H. Wayne.,Emmerich, William.,Bradford, James A..,Sims, Phillip L..,Johnson, Douglas A..,...&Dugas, William A..(2010).Precipitation Regulates the Response of Net Ecosystem CO2 Exchange to Environmental Variation on United States Rangelands.RANGELAND ECOLOGY & MANAGEMENT,63(2),176-186.
MLA Polley, H. Wayne,et al."Precipitation Regulates the Response of Net Ecosystem CO2 Exchange to Environmental Variation on United States Rangelands".RANGELAND ECOLOGY & MANAGEMENT 63.2(2010):176-186.
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