In order to understand the potential significance of carbon in soil in the form of biochar, its
characteristics and dynamics should be compared to those of the remaining soil organic
matter, which accounts for most of the carbon that exists in soil (the exception being
calcareous soils which contain stocks of inorganic carbon in carbonate minerals). Depending
on land-use and climate, most soils contain up to approximately 100 t ha-1 carbon as organic
matter. Peat soils, though, comprise mainly organic matter and contain much more carbon
on a per unit area basis. It is increasingly recognised, however, that a greater proportion of
the total carbon may comprise an accumulated store of the products of burning or fire
(Skjemstad et al., 2004a), and that this has implications for the response of the wider soil
carbon pool to climate change (Skjemstad et al., 1999; Lehmann et al., 2008).
In order to understand the potential significance of carbon in soil in the form of biochar, its
characteristics and dynamics should be compared to those of the remaining soil organic
matter, which accounts for most of the carbon that exists in soil (the exception being
calcareous soils which contain stocks of inorganic carbon in carbonate minerals). Depending
on land-use and climate, most soils contain up to approximately 100 t ha-1 carbon as organic
matter. Peat soils, though, comprise mainly organic matter and contain much more carbon
on a per unit area basis. It is increasingly recognised, however, that a greater proportion of
the total carbon may comprise an accumulated store of the products of burning or fire
(Skjemstad et al., 2004a), and that this has implications for the response of the wider soil
carbon pool to climate change (Skjemstad et al., 1999; Lehmann et al., 2008).
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