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Concept
Carbon farming
Résumé
Carbon farming is a name for a variety of agricultural methods aimed at sequestering atmospheric carbon into the soil and in crop roots, wood and leaves. The aim of carbon farming is to increase the rate at which carbon is sequestered into soil and plant material with the goal of creating a net loss of carbon from the atmosphere. Increasing a soil's organic matter content can aid plant growth, increase total carbon content, improve soil water retention capacity and reduce fertilizer use. Carbon farming is one component of climate smart agriculture.
Carbon emission reduction methods in agriculture can be grouped into two categories: reducing and displacing emissions and enhancing carbon sequestration. Reductions include increasing the efficiency of farm operations (e.g. more fuel-efficient equipment) and interrupting the natural carbon cycle.
In addition to agricultural activities, forests management is also a tool that is used in carbon farming. The practice of carbon farming is often done by individual land owners who are given incentive to use and to integrate methods that will sequester carbon through policies created by governments. Carbon farming methods will typically have a cost, meaning farmers and land-owners need a way to profit from the use of carbon farming, thus requiring government programs.
Biological carbon fixationCarbon sequestration and Carbon dioxide removal
In part, soil carbon is thought to accumulate when decaying organic matter was physically mixed with soil. Small roots die and decay while the plant is alive, depositing carbon below the surface. More recently, the role of living plants has been emphasized where carbon is released as plants grow. Soils can contain up to 5% carbon by weight, including decomposing plant and animal matter and biochar.
About half of soil carbon is found within deep soils. About 90% of this is stabilized by mineral-organic associations.
At least 32 Natural Resource Conservation Service (NRCS) practices improve soil health and sequester carbon, along with important co-benefits: increased water retention, hydrological function, biodiversity and resilience.
Source officielle
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