Effects of reforestation, deforestation, and afforestation on carbon storage in soils

摘要: This study reviews the effects of changes in land use and management on SOC pools forest soils. In 1990s, deforestation remained most important land-use change tropical regions (-142 x 10(6) ha per year). non-tropical forested area increased developed countries as a result natural reforestation (+26 Deforestation also continued under-developed temperate regions. Without intensive site preparation, harvest followed by regeneration or has little impact mineral topsoil (0-0.3 m). Intensive preparation results losses 6-13% initial from first decades. On average, conversion to cropland 42% (or 0.1-1500 g (C) m(-2)) topsoil, whereas pasture gains 8%. The largest storage occur within two After reforestation, accumulation depends kind managed established. Under productive deciduous (excluding eucalypts), accumulates at rate 20-50 m(-2) year, could recover cultivation-induced 40 years. coniferous carbon is highest (95 year) organic layer, which very susceptible practices. much lower (4 year), recovery might take several hundred resulting 'memory effect' introduced large variation contemporary budget studies. Thus, there seems be temporal asymmetry between period time over depletion occurs needed for soil. should taken into account when considering land-management activities decrease atmospheric CO2 concentrations this century.