The effect of land-use change on the net exchange rates of greenhouse gases: A compilation of estimates

摘要: Abstract One of the environmental impacts land-use change (LUC) is a in net exchange greenhouse gases (GHGs) carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). Here we summarize data changes soil organic (SOC) stocks CH4 N2O emissions associated with LUC. We combine that estimates biomass (C) stock enteric following Data were expressed common units by converting fluxes to CO2 equivalents (CO2 eq) using established 100-year global warming potentials, carbon-stock converted annual averaging over 100 years. Conversion from natural forest cropland or grassland resulted 7.3 ± 0.6 (mean ± 95% confidence intervals) 5.9 ± 0.3 t CO2 eq ha−1 y−1, respectively, while conversion secondary reduced 5.3 ± 0.9 3.6 ± 0.7 t CO2 eq ha−1 y−1, respectively. In all LUCs involving forests, C dominated overall GHG emissions. A retrospective analysis indicated LUC forests agricultural lands contributed cumulative 1569 ± 43 Gt CO2 eq between 1765 2005, which equivalent average 6.5 ± 0.2 Gt CO2 eq per year.