Читать книгу Applied Soil Chemistry - Группа авторов - Страница 29
1.3.1 Croplands
ОглавлениеSoils underlying arable croplands typically possess low carbon soil contents (less than about 150 t C ha−1), because they are either under cultivation or have been cultivated in the past [14]. Typically, such soils are maintained under the condition that causes them to lose their carbon to the atmosphere and by leaching at a rapid rate. they present a major challenge for sustainable future sequestration of carbon in soils.
Table 1.1 Estimated soil carbon complements in the top 1 m of common vegetated systems. The ranges provided indicate uncertainty in the global average carbon density for each major vegetated system considered (after Hester et al., 2010) [14].
Ecosystem | Carbon density (t C ha-1) |
---|---|
Wetland | 643 |
Cropland (arable) | 80–122 |
Tundra | 127–206 |
Deserts and semi-deserts | 42–57 |
Temperate grassland and shrubland | 99–236 |
Tropical savanna and grassland | 90–117 |
Boreal forest | 247–344 |
Temperate forest | 96–147 |
Tropical forest | 122–123 |