Читать книгу Applied Soil Chemistry - Группа авторов - Страница 30

Grasslands typically display higher soil carbon contents rather than cropland soils. Table 1.1 displays the carbon density of undisturbed naturally occurring grassland soils. Some crop rotation schemes combine periods of grassland cultivation with periods of arable crop growth. Soils associated with such systems tend to have carbon densities higher than croplands but not as high as natural undisturbed grassland soils. The soil carbon density tends to increase for areas that are laid to grass for higher fractions of the crop rotation cycle. Extensive cultivation of fast-growing bio-energy grasses with deep root systems, such as switchgrass and miscanthus, has the potential to substantially increase the carbon density of grassland and cropland converted to grassland.