uid=HFR,o=lter,dc=ecoinformatics,dc=org all public read HF052 Jerry Melillo Richard Bowden John Aber Researcher Mark Castro Researcher Paul Steudler Researcher 2000

This study examined the fluxes of greenhouse gases between soils and the atmosphere in the Simulated Hurricane Experiment. For details on methods and results, please see the published paper (Bowden, R., M. C. Castro, J. M. Melillo, P. A. Steudler and J. D. Aber. 1993. Fluxes of greenhouse gases between soils and the atmosphere in a temperate forest following a simulated hurricane blowdown. Biogeochemistry 21: 61-71.) The Abstract from the paper is reproduced below. "Fluxes of nitrous oxide (N2O), carbon dioxide (CO2), and methane (CH4) between soils and the atmosphere were measured monthly for one year in a 77-year-old temperate hardwood forest following a simulated hurricane blowdown. Emissions of CO2 and uptake of CH4 for the control plot were 4.92 MT C ha-1 y-1 and 3.87 kg C ha-1 y-1, respectively, and were not significantly different from the blowdown plot. Annual N2O emissions in the control plot (0.23 kg N ha-1 y-1) were low and were reduced 78% by the blowdown. Net N mineralization was not affected by the blowdown. Net nitrification was greater in the blowdown than in the control, however, the absolute rate of net nitrification, as well as the proportion of mineralized N that was nitrified, remained low. Fluxes of CO2 and CH4 were correlated positively to soil temperature, and CH4 uptake showed a negative relationship to soil moisture. Substantial resprouting and leafing out of downed or damaged trees, and increased growth of understory vegetation following the blowdown, were probably responsible for the relatively small differences in soil temperature, moisture, N availability, and net N mineralization and net nitrification between the control and blowdown plots, thus resulting in no change in CO2 or CH4 fluxes, and no increase in N2O emission."

air temperature carbon dioxide hurricane damage methane nitrogen nitrous oxide soil moisture soil temperature

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http://harvardforest.fas.harvard.edu:8080/exist/xquery/data.xq?id=hf052 Tom Swamp Tract (Harvard Forest) -72.20 -72.20 +42.49 +42.49 310 310 meter 1989-08-01 1991-12-31 Jerry Melillo Marine Biological Laboratory

The Ecosystem Center Woods Hole MA 02543 USA

(508) 289-7494 jmelillo@mbl.edu Harvard Forest

324 North Main Street Petersham MA 01366 USA

(978) 724-3302 (978) 724-3595 http://harvardforest.fas.harvard.edu hf052-01-control.csv control plot hf052-01-control.csv 1868 1 #x0A column , http://harvardforest.fas.harvard.edu/data/p05/hf052/hf052-01-control.csv Date date YYMMDD Var variable n number of samples se standard error x mean N2O N2O flux in ugN/m2/h microgramPerMeterSquaredPerHour 0.01 real CO2 CO2 flux in mgC/m2/h milligramPerMeterSquaredPerHour 0.1 real CH4 CH4 flux in mgC/m2/h milligramPerMeterSquaredPerHour 0.001 real SoilT-O Soil temperature at 0-2.5 cm depth in degrees C celsius 0.1 real SoilT-M Soil temperature at 2.5-5.0 cm depth in degrees C celsius 0.1 real AirT air temperature celsius 0.1 real SoilM-O Soil moisture at 2.5-5.0 cm depth in gH2O/gSoil gramsPerGram 0.01 real SoilM-M Soil moisture at 2.5-5.0 cm depth in gH2O/gSoil gramsPerGram 0.01 real 53 hf052-02-blowdown.csv blowdown plot hf052-02-blowdown.csv 1874 1 #x0A column , http://harvardforest.fas.harvard.edu/data/p05/hf052/hf052-02-blowdown.csv Date date YYMMDD Var variable n number of samples se standard error x mean N2O N2O flux in ugN/m2/h microgramPerMeterSquaredPerHour 0.01 real CO2 CO2 flux in mgC/m2/h milligramPerMeterSquaredPerHour 0.1 real CH4 CH4 flux in mgC/m2/h milligramPerMeterSquaredPerHour 0.001 real SoilT-O soil temperature at 0-2.5 cm depth celsius 0.1 real SoilT-M soil temperature at 2.5-5.0 cm depth celsius 0.1 real AirT air temperature celsius 0.1 real SoilM-O soil moisture at 0-2.5 cm depth in gH2O/gSoil gramsPerGram 0.01 real SoilM-M soil moisture at 2.5-5.0 cm depth in gH2O/gSoil gramsPerGram 0.01 real 53 completed plot soil short-term measurement inorganic nutrients disturbance