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Modelling of carbon sequestration and other soil changes
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40 2019 ND-CP 413905
| Modelling of carbon sequestration and other soil changes
Changes in agricultural land use and management practices can sequester C in agricultural soils and could reduce emissions (Lal 2003). Carbon enters the soil from roots, litter, crop residues and animal manure, and is stored primarily as soil organic matter (SOM). The majority of freshly deposited SOM decomposes rapidly and releases CO 2 to the atmosphere. Some SOM, particularly in the subsoil, becomes stabilized. Carbon fluxes are determined by rates of input and decomposition. However, in many parts of the world, agriculture and other land-use activities contribute to an alarming increase in carbon release from soils to the atmosphere in the form of CO 2 . Carbon sequestration in soils is a strategy for mitigating climate change based on the Land evaluation – towards a revised framework 96 assumption that carbon flux from the air to the soil can be increased while carbon flux from the soil back to the atmosphere is reduced. Certain soil management practices and land uses can transform soil from a carbon source into a carbon sink, and have the potential to reduce atmospheric CO 2 . Monitoring networks of net CO 2 exchange help understand the source-sink mechanisms and improve the terrestrial component in global carbon models. At the same time, carbon sequestration can offer substantial benefits to farmers and small landholders, who directly manage the soil carbon pool. Improved land and soil management practices that help sequester carbon in soils can result in higher soil fertility and increased yields, benefiting local populations economically, environmentally and socially. Carbon sequestration in soils also has potential with regard to the international trading of carbon credits. tải về 0.57 Mb. Chia sẻ với bạn bè của bạn:
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