Many carbon cost-benefit studies have either been devoted to plantations (i.e., afforestation, and reforestation; [8],[11],[12]), or to comparisons between timber production and forest conversion to crops as alternatives to forest conservation [13]-[16] [13]-[16]
Other targets announced by Rousseff include 12 million hectares of reforestation, 5 million hectares of crops-livestock-forestry integration, the end of illegal deforestation, and meeting 45% of the country's energy needs with renewables up from a 40% share today largely thanks to hydroelectricity and sugarcane ethanol.
Changes in forest cover are known to have a major impact on biodiversity and ecosystem functions, [31], [32], particularly afforestation and reforestation [1].
Recurrent changes are caused primarily by plantation silviculture practices that have a cyclic component, with its temporal pattern of forest harvest and reforestation (747,882 ha).
Surveys of above-ground biomass of 264 reforestation sites (132 woodlots, 132 environmental plantings) within the agricultural regions of South Australia were conducted, and combined with spatial information on climate and soils, to develop new spatial and temporal models of plant density and above-ground biomass productivity from reforestation.
Many carbon cost-benefit studies have either been devoted to plantations (i.e., afforestation, and reforestation; [ 8, 11, 12]), or to comparisons between timber production and forest conversion to crops as alternatives to forest conservation [ 13- 16].
Using in situ closed chambers the annual average emissions of N2O from the leguminous reforestation area (3.3 kg N2ON ha−1 y−1) was significantly higher than agricultural areas with maize (2.2 kg N2ON ha−1 y−1).
Nevertheless, rates of forest loss varied considerable between different time periods, with slight reforestation initially (1.55%; 1973 1990), followed by a marked decline (−8.08%; 1990 2000), and finally a noticeable increases in forest cover (4.92%; 2000 2007) that corresponds with changes in public policy and trends in population migration.
The entire LMAV currently stores 97 TgC in forests and reasonable carbon storage for the entire LMAV may be about 335 TgC, based on increased carbon storage and reforestation of 600,000 ha of marginal agricultural land, which would double the current forested extent.
It was found that despite an estimated reforestation of 10,0727 ± 3480 ha (95% confidence interval), the combined rate of forest and savannah loss amounted to 56,271 ± 9405 ha (representing a 16% loss of the forestlands present in 2001), resulting in a rather sharp net loss of forestlands in the study area.
Between 2003 and 2011, national forestry programmes in China resulted in the reforestation of 36.5m hectares of land.
