Abstract
Coverage rate, a critical variable for gridded forest area, has been neglected by previous studies in estimating the annual gross primary production (GPP) of global forest ecosystems. In this study, we investigated to what extent the coverage rate could impact forest GPP estimates from 1982 to 2011. Here we show that the traditional calculation without considering the coverage rate globally overestimated the forest gross carbon dioxide uptake by approximately 8.7%, with a value of 5.12 ± 0.23 Pg C yr−1, which is equivalent to 48% of the annual emissions from anthropogenic activities in 2012. Actually, the global annual GPP of forest ecosystems is approximately 53.71 ± 4.83 Pg C yr−1 for the past 30 years by taking the coverage rate into account. Accordingly, we argue that forest annual GPP calculated by previous studies has been overestimated due to the exaggerated forest area, and therefore, coverage rate may be a required factor to further quantify the global carbon cycle.
Highlights
Grids (Fig. 1b) and non-forest grids (Fig. 1c) into calculation, and further investigated the extent to which forest coverage rate could impact the global annual gross primary production (GPP) at a grid resolution of 0.5° × 0.5° over the period of 1982− 2011
The GPP generated by FORCCHN for the period of 1993− 2006 was 1329.1 g C m−2 yr−1, which is much closer to the average value of the seven estimations (1305.4 g C m−2 yr−1)
Different methods used to quantify the global annual GPP (Pg C yr−1) of forest ecosystems show substantial disagreement. These uncertainties are suggested to arise from the discrepancies in GPP per unit area (g C m−2 yr−1) and forest area
Summary
Grids (Fig. 1b) and non-forest grids (Fig. 1c) into calculation, and further investigated the extent to which forest coverage rate could impact the global annual GPP at a grid resolution of 0.5° × 0.5° over the period of 1982− 2011.
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