Peatland responses to varying interannual moisture conditions as measured by automatic CO<sub>2</sub> chambers

Global Biogeochemical Cycles - Tập 17 Số 2 - 2003
Jill L. Bubier1, P. M. Crill2, Andrew Mosedale2, Steve Frolking2, Ernst Linder3
1Environmental Studies Program, Department of Earth and Environment Mount Holyoke College South Hadley Massachusetts USA
2Complex Systems Research Center, Institute for the Study of Earth, Oceans and Space; University of New Hampshire; Durham; New Hampshire; USA
3Department of Mathematics and Statistics University of New Hampshire Durham New Hampshire USA

Tóm tắt

Net ecosystem CO2 exchange (NEE) was measured from June 2000 through October 2001 by 10 automatic chambers at a peatland in southeastern New Hampshire. The high temporal frequency of this sampling method permitted detailed examination of NEE as it varied daily and seasonally. Summer of 2001 was significantly drier than the 30‐year average, while summer of 2000 was wetter than normal. Although NEE varied spatially across the peatland with differences in plant species composition and biomass, maximum CO2 uptake was 30–40% larger in the drier summer in evergreen and deciduous shrub communities but the same or lower in sedge sites. Ecosystem respiration rates were 13–84% larger in the drier summer depending on plant growth form with water table and temperature as strong predictors. Ecosystem respiration was also correlated with maximum ecosystem productivity and foliar biomass suggesting that plant processes, water table, and temperature are tightly linked in their control of respiratory losses. The ratio between maximum productivity and respiration declined for evergreen shrub and sedge sites between the wet and dry summer, but increased in deciduous shrub sites. A drier climate may reduce the CO2 sink function of peatlands for some growth forms and increase it for others, suggesting that ecosystem carbon and climate models should account for differences in growth form responses to climate change. It also implies that plant functional types respond on short timescales to changes in moisture, and that the transition from sedges to shrubs could occur rapidly in peatlands under a drier and warmer climate.

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Tài liệu tham khảo

10.1016/S0169-5347(00)89156-9

Aerts R., 1999, Interspecific competition in natural plant communities: Mechanisms, trade‐offs and plant soil feedbacks, J. Exp. Bot., 50, 19, 10.1093/jxb/50.330.29

10.1007/s004420050177

10.1890/0012-9658(1999)080[0161:CBOABB]2.0.CO;2

10.1029/2000JD900481

10.1080/11956860.1998.11682491

10.1029/1999JD900219

10.1002/hyp.1233

Bubier J. L., 2003, Between year and site variability in growing season net ecosystem CO2 exchange at a large peatland, Ontario, Canada, Ecosystems

10.1016/S1464-1909(98)00021-5

10.1029/97GB01365

10.2307/2265504

10.2307/1939337

10.2307/3236278

10.1029/98JD00084

10.1038/35041539

10.1029/1999GB900088

10.1038/35051650

10.1029/94GB01839

10.1007/s10021-001-0105-1

10.1029/2001GB001457

10.1029/97GB03367

10.2307/2260950

10.2307/1941811

10.1093/treephys/17.8-9.537

10.1038/35009170

10.1175/1520-0442(1997)010<0662:SDINMI>2.0.CO;2

10.1029/1999GB001243

10.1016/S0048-9697(00)00523-4

10.1046/j.1365-2745.2000.00438.x

10.2307/2963492

10.1046/j.1365-2486.2001.00412.x

10.1007/BF00329050

10.1890/0012-9658(2000)081[0453:PCNICC]2.0.CO;2

10.1029/1999JD900136

10.1016/S0929-1393(98)00145-0

10.1046/j.1365-2486.2000.06011.x

10.2307/1552215

10.1029/2000JD900588

10.1029/2002GB001983

10.1080/02827589609382940

10.1126/science.1074153

10.1002/hyp.3360090810

10.1029/96GB00365

Minkkinen K., 1998, Long‐term effect of forest drainage in the peat carbon stores of pine mires in Finland, Can. J. For. Res., 28, 1267, 10.1139/x98-104

Moore T. R., 1993, Influence of temperature and water table position on carbon dioxide and methane emissions from columns of peatland soils, J. Soil Sci., 44, 651, 10.1111/j.1365-2389.1993.tb02330.x

10.1097/00010694-200101000-00007

10.1023/A:1005408719297

10.1046/j.0022-0477.2001.00633.x

10.1038/361520a0

10.2307/1941992

10.1034/j.1600-0889.1992.t01-1-00001.x

10.1034/j.1600-0889.1992.t01-1-00002.x

SAS Institute 2001 Duxbury Boston Mass.

10.1097/00010694-200002000-00006

10.1038/35102500

10.1029/98GB02738

10.1016/B978-0-12-168250-7.50014-6

10.1111/j.1751-8369.1999.tb00300.x

10.1016/B978-0-12-168250-7.50015-8

10.1641/0006-3568(2000)050[0871:GWATEA]2.0.CO;2

R. H. Shumway D. S. Stoffer 2000 Springer‐Verlag New York

10.1029/95JD01227

10.2307/2261357

10.1007/BF00336052

10.1139/b72-289

10.2307/1934791

10.1029/96JD03877

J. H. M. Thornley I. R. Johnson 1990 Clarendon Oxford England

10.1029/1999JD900433

10.1191/0959683602hl522rp

10.2307/1942060

10.1029/95GB03871

10.1890/0012-9658(2000)081[3464:ROBAFP]2.0.CO;2

10.1034/j.1600-0889.2001.530501.x

10.1890/1051-0761(2001)011[0327:PPAFPC]2.0.CO;2

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Global Biogeochemical Cycles

Tập 17 Số 2

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