Results
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.
Annual variation of the CO2 flux (FC02) is shown in Figure 3. Daily means of half-hourly fluxes are plotted, along with a 15 day running mean to show seasonal variation. 45% of half-hourly data are measured, with missing values estimated using models of ecosystem respiration and gross ecosystem production.
Figure 4 shows cumulative net ecosystem exchange (NEE) at Moanatuatua bog for the 1-year period 1-Jul-1999 to 30-Jun-2000. Annual carbon sequestration was 5.2 t C ha-1. The bog acts as a sink for atmospheric carbon year-round, in contrast to typical results for Northern-hemisphere bogs and forests, where large losses are often recorded during senescence. Such large sink strengths are generally found for young-growth forests.
The next section contains resources and links related to this experiment.