enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Soil carbon - Wikipedia

    en.wikipedia.org/wiki/Soil_carbon

    Carbon, as it relates to the organic matter of soils, is a major component of soil and catchment health. Several factors affect the variation that exists in soil organic matter and soil carbon; the most significant has, in contemporary times, been the influence of humans and agricultural systems.

  3. Soil organic matter - Wikipedia

    en.wikipedia.org/wiki/Soil_organic_matter

    The pool of organic carbon exists in dynamic equilibrium between gains and losses; soil may therefore serve as either a sink or source of carbon through carbon sequestration or greenhouse gas emissions, respectively, depending on exogenous factors.

  4. Soil - Wikipedia

    en.wikipedia.org/wiki/Soil

    Organic carbon held in soil is eventually returned to the atmosphere through the process of respiration carried out by heterotrophic organisms, but a substantial part is retained in the soil in the form of soil organic matter; tillage usually increases the rate of soil respiration, leading to the depletion of soil organic matter. [24]

  5. Physical properties of soil - Wikipedia

    en.wikipedia.org/wiki/Physical_properties_of_soil

    When the organic component of a soil is substantial, the soil is called organic soil rather than mineral soil. A soil is called organic if: Mineral fraction is 0% clay and organic matter is 20% or more; Mineral fraction is 0% to 50% clay and organic matter is between 20% and 30%; Mineral fraction is 50% or more clay and organic matter 30% or ...

  6. Particulate organic matter - Wikipedia

    en.wikipedia.org/wiki/Particulate_organic_matter

    Particulate organic matter (POM): is the organic matter that retains evidence of its original cellular structure, [18] and is discussed further in the next section. Humus: is usually the largest proportion of organic matter in soil, contributing 45 to 75%. Typically it adheres to soil minerals, and plays an important role structuring soil.

  7. Humin - Wikipedia

    en.wikipedia.org/wiki/Humin

    Humins make up about 50% of the organic matter in soil. [ 1 ] Due to their very complex molecular structure, humic substances, including humin, do not correspond to pure substances but consist of a mixture of many compounds that remain very difficult to characterize even using modern analytical techniques.

  8. Soil matrix - Wikipedia

    en.wikipedia.org/wiki/Soil_matrix

    Stocking and destocking of soil carbon are under strong climate influence. [68] They are normally balanced through an equilibrium between production and mineralization of organic matter, but the balance is in favour of destocking under present-day climate warming, [69] and more especially in permafrost. [70]

  9. Mineralization (soil science) - Wikipedia

    en.wikipedia.org/wiki/Mineralization_(soil_science)

    In general, organic matter contacting soil has too little nitrogen to support the biosynthetic needs of the decomposing soil microbial population. If the C:N ratio of the decomposing organic matter is above circa 30:1 then the decomposing microbes may absorb nitrogen in mineral form as, e. g., ammonium or nitrates. This mineral nitrogen is said ...