Carbon Cycling in a Big Cypress
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1 Carbon Cycling in a Big Cypress National Preserve Marsh Barclay Shoemaker, Jordan Barr, Christian Lopez, and Vic Engel Photo taken by Patrick Lynch (SFWMD)
2 Measurement of ET in Big Cypress National Preserve, South Florida
3 Acknowledgements South Florida Water Management District Steve Krupa Mike Duever Cynthia Gefvert U.S. Geological Survey Christian Lopez Troy Bernier Dave Sumner Big Cypress National Preserve Damon Doumlele National Park Service Jordan Barr Vic Engel
4 Marsh platform site Pine upland 120 tower site Location of proposed ET site Vegetation Community Cypress swamp 120 tower site Dwarf cypress 50 tower site Wet prarie platform site
5 Hensen Marsh Measures ET and CO 2 Net radiation Solar radiation Rainfall Surface/groundwater stage Ground-water temperature Surface-water temperature Air temperature Relative humidity Soil temperature Soil heat flux Photo taken by Patrick Lynch (SFWMD)
6 Modified from Standard (2000)
7 Carbon Dioxide (CO2) Measurements Using LICOR-7500 Using LICOR-7500 gas analyzer
8 Turbulent flux of water vapor Modified from Standard (2000)
9 Carbon Dioxide (CO2) Measurements CO2 concentration Solar radiation Solar radiation, in watts per square meter ic meter in mg per cubi CO2 concentration, i 6/27/ /26/2007 6/25/2007 6/24/2007 6/23/2007 6/22/2007 Soil respiration at night? Turbulent mixing during These data are preliminary and have not received the day peer-review and USGS approval for publication
10 Biomass : total dry-mass of the plants [M] (g) Primary Production : total plant-biomass per unit area [ML -2 ] (g m -2 ) Productivity : rate of production [ML -2 T -1 ] (g m -2 year -1 ) Gross Ecosystem Productivity (GEP) : gross plant productivity. Excludes respiration by the plants. Ecosystem Respiration (ER) : plant and soil respiration Net Ecosystem Productivity (NEP) : net amount of carbon uptake by the ecosystem, including plants, soil and woody debris Photo taken by Patrick Lynch (SFWMD).
11 Ecosystem Convention + flux is into ecosystem - flux is out of ecosystem GEP = NEP+ER Photo taken by Patrick Lynch (SFWMD)
12 Sep09 Carbon Exchange 130 NEP GEP ER Jun09 Mar09 Dec08 Sep08 Jun08 Mar08 Dec07 GEP = NEP+ER Sep07 Jun Carbon exchange, in g C m-2
13 Annual Totals Annual totals Year GEP (g C m 2) ER (g C m 2) NEP (g C m 2) * *missing November and December 2009 NEP = GEP-ER
14 Net Ecosystem Production (NEP) Air Temp NEP 50 Monthly NEP, in g C m Mean air temperature, celsius Oct09 Aug09 Jun09 Apr09 Feb09 Dec08 Oct08 Aug08 Jun08 Apr08 Feb08 Dec07 Oct07 Aug07 Jun07
15 Sep09 Sep09 NEP Jun09 Mar09 Stage Jun09 Mar09 Dec08 Dec08 Sep08 Sep08 Jun08 Jun08 Mar08 Dec07 Sep07 Jun Mar08 Dec07 Sep07 Jun Me an monthly stage, in feet above (+) or below (-) landsurface Monthly NEP, in g C m-2
16 Future Work Dwarf Cypress (55 tower) Measures ET Net radiation Solar radiation Rainfall Wind speed and direction Surface/groundwater stage Ground-water temperature Surface-water temperature Air temperature Relative humidity Sap flow (Bovard, FGCU) Photo taken by Patrick Lynch (SFWMD)
17 Cypress Swamp (120 tower) Measures ET Net radiation Solar radiation Rainfall Wind speed and direction Surface/groundwater stage Ground-water temperature Surface-water temperature Air temperature Relative humidity Soil temperature Soil heat flux Soil moisture Sap flow (Bovard, FGCU) Future Work Photo taken by Patrick Lynch (SFWMD)
18 Future Work Pine upland (120 tower) Measures ET Net radiation Solar radiation Rainfall Surface/groundwater stage Ground-water temperature Surface-water temperature Air temperature Relative humidity Soil moisture Soil temperature Soil heat flux Sap Flow (Bovard) Photo taken by Patrick Lynch (SFWMD)
19 Conclusions 1. Site can be a carbon source or sink. NEP(Jan08 to Dec08) = 125 g C m-2 NEP(Jan09 to Nov09) = -34 g C m-2 2. Air temp and hydro-period partly explain NEP variability. Any questions? Barclay at bshoemak@usgs.gov Photo taken by Patrick Lynch (SFWMD)
20 WISH US LUCK AND THANKS! Pyranometer Air Temperature Relative Humidity Probe Net Radiometers
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