Results
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Results
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The results displayed on this page are preliminary and should be treated as such. Please contact the site authors if you are interested in finding out more or want to use some of this information.
Figure 1 Diurnal pattern of CO2 fluxes for 23 February 2000. Negative values represent net uptake. Figure 1 shows the diurnal cycle of half-hourly fluxes of CO2 for one day in summer 2000. The mean CO2 flux is -2.15 umol m-2 s-1, indicating net ecosystem production of 2.2 g C m-2 for the day. Figure 2 GEP vs. PPFD for all half-hourly periods Jul-1999 to Jul-2000. Figure 2 shows gross ecosystem production (GEP) vs. photosynthetic photon flux density (PPFD). GEP is estimated by subtracting modelled values of ecosystem respiration from valid eddy covariance data.
Figure 3 Daily CO2 fluxes at Moanatuatua for 1999 and 2000 Annual variation of the CO2 flux for the 23-month period Jan-1999 to Dec-2000 is shown in Figure 3. Daily means of half-hourly fluxes are plotted, along with a 15 day running mean to show seasonal variation. Approximately 45% of half-hourly data are measured, with missing values estimated using models of ecosystem respiration and gross ecosystem production.
Figure 4 Cumulative net ecosystem exchange (NEE) at Moanatuatua for 1999-2000. Figure 4 shows cumulative net ecosystem exchange (NEE) at Moanatuatua bog for the 23-month period 10-Jan-1999 to 12-Dec-2000. Annual carbon sequestration averaged 1.96 t C ha-1yr-1. The bog acts as a sink for atmospheric carbon for most of the year, with only a short period of loss in winter, in contrast to typical results for Northern-hemisphere bogs and forests, where large losses are often recorded during senescence. The next section contains resources and links related to this experiment.
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