Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal detritus at various stages of decomposition, cells and tissues of soil microbes, and substances that soil microbes synthesize. SOM provides numerous benefits to the physical and chemical properties of soil and its capacity to provide regulatory ecosystem services.[1] SOM is especially critical for soil functions and quality.[2]

The benefits of SOM result from a number of complex, interactive, edaphic factors; a non-exhaustive list of these benefits to soil function includes improvement of soil structure, aggregation, water retention, soil biodiversity, absorption and retention of pollutants, buffering capacity, and the cycling and storage of plant nutrients. SOM increases soil fertility by providing cation exchange sites and being a reserve of plant nutrients, especially nitrogen (N), phosphorus (P), and sulfur (S), along with micronutrients, which the mineralization of SOM slowly releases. As such, the amount of SOM and soil fertility are significantly correlated.[3]

SOM also acts as a major sink and source of soil carbon (C). Although the C content of SOM varies considerably,[4][5] SOM is ordinarily estimated to contain 58% C, and "soil organic carbon" (SOC) is often used as a synonym for SOM, with measured SOC content often serving as a proxy for SOM. Soil represents one of the largest C sinks on Earth and is significant in the global carbon cycle and therefore for climate change mitigation.[6] Therefore, SOM/SOC dynamics and the capacity of soils to provide the ecosystem service of carbon sequestration through SOM management have received considerable attention.[7]

The concentration of SOM in soils generally ranges from 1% to 6% of the total mass of topsoil for most upland soils. Soils whose upper horizons consist of less than 1% of organic matter are mostly limited to deserts, while the SOM content of soils in low lying, wet areas can be as great as 90%. Soils containing 12% to 18% SOC are generally classified as organic soils.[8]

SOM can be divided into three genera: the living biomass of microbes, fresh and partially decomposed detritus, and humus. Surface plant litter, i. e., fresh vegetal detritus, is generally excluded from SOM.[9]

Sources

The primary source of SOM is vegetal detritus. In forests and prairies, for example, different organisms decompose the fresh detritus into simpler compounds. This involves several stages, the first being mostly mechanical, and becoming more chemical as decomposition progresses. The microbial decomposers are included in the SOM, and form a food web of organisms that prey upon each other and subsequently become prey.

Above detritivores there are also herbivores that consume fresh vegetal matter, the residue of which then passes to the soil. The products of the metabolisms of these organisms are the secondary sources of SOM, which also includes their corpses. Some animals, like earthworms, termites, ants, and millipedes contribute to both vertical and horizontal translocation of organic matter.[1]

Additional sources of SOM include plant root exudates[10] and charcoal.[11]

Composition

The water content of most vegetal detritus is in the range of 60% to 90%. The dry matter consists of complex organic matter that is composed primarily of carbon, oxygen, and hydrogen. Although these three elements make up about 92% of the dry weight of the organic matter in soil, other elements are very important for the nutrition of plants, including nitrogen, phosphorus, potassium, sulfur, calcium, magnesium, and many micronutrients.[1]

Organic compounds in vegetal detritus include:

Decomposition

Main article: Decomposition

Vegetal detritus in general is not soluble in water and therefore is inaccessible to plants. It constitutes, nevertheless, the raw matter from which plant nutrients derive. Soil microbes decompose it through enzymatic biochemical processes, obtain the necessary energy from the same matter, and produce the mineral compounds that plant roots are apt to absorb.[12] The decomposition of organic compounds specifically into mineral, i. e., inorganic, compounds is denominated "mineralization". A portion of organic matter is not mineralized and instead decomposed into stable organic matter that is denominated "humus".[1]

The decomposition of organic compounds occurs at very different rates, depending on the nature of the compound. The ranking, from fast to slow rates, is:

  1. Sugars, starches, and simple proteins
  2. Proteins
  3. Hemicelluloses
  4. Cellulose
  5. Lignins and fats

The reactions that occur can be included in one of three genera:

The mineral products are:

Element Mineral Products
Carbon CO2, CO32−, HCO3, CH4, C
Nitrogen NH4+, NO2, NO3, N2 (gas), N2O (gas)
Sulfur S, H2S, SO32−, SO42−, CS2
Phosphorus H2PO4, HPO42−
Others H2O, O2, H2, H+, OH, K+, Ca2+, Mg2+, etc.

Humus

Main article: Humus

As vegetal detritus decomposes, some microbially resistant compounds are formed, including modified lignins, oils, fats, and waxes. Secondly, some new compounds are synthesized, like polysaccharides and polyuronids. These compounds are the basis of humus. New reactions occur between these compounds and some proteins and other products that contain nitrogen, thus incorporating nitrogen and avoiding its mineralization. Other nutrients are also protected in this way from mineralization.

Humic substances

Humic substances are classified into three genera based on their solubility in acids and alkalis, and also according to their stability:

Function in carbon cycling

See also: Soil carbon

Soil has a crucial function in the global carbon cycle, with the global soil carbon pool estimated to be 2,500 gigatons. This is 3.3 times the amount of the atmospheric pool at 750 gigatons and 4.5 times the biotic pool at 560 gigatons. The pool of organic carbon, which occurs primarily in the form of SOM, accounts for approximately 1,550 gigatons of the total global carbon pool,[13][14] with soil inorganic carbon (SIC) accounting for the remainder. 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 sequestration or greenhouse gas emissions, respectively, depending on exogenous factors.[15]

See also

References

  1. ^ a b c d e f g Weil, Ray R.; Brady, Nyle C. (2016). The nature and properties of soils (15th ed.). Upper Saddle River, New Jersey: Pearson. ISBN 978-0133254488. Retrieved 17 December 2023.
  2. ^ Beare, Mike H.; Cabrera, Miguel L.; Hendrix, Paul F.; Coleman, David C. (1994). "Aggregate-protected and unprotected organic matter pools in conventional and no-tillage soils". Soil Science Society of America Journal. 58 (3): 787–95. doi:10.2136/sssaj1994.03615995005800030021x. Retrieved 17 December 2023.
  3. ^ Tiessen, Holm; Cuevas, Elvira; Chacón, Prudencio (1994). "The role of soil organic matter in sustaining soil fertility" (PDF). Nature. 371: 783–85. doi:10.1038/371783a0. Retrieved 17 December 2023.
  4. ^ Périé, Catherine; Ouimet, Rock (2008). "Organic carbon, organic matter and bulk density relationships in boreal forest soils". Canadian Journal of Soil Science. 88 (3): 315–25. doi:10.4141/CJSS06008. Retrieved 24 December 2023.
  5. ^ Jain, Terri; Graham, Russell T.; Adams, David L. (1997). "Carbon to organic matter ratios for soils in Rocky Mountain coniferous forests". Soil Science Society of America Journal. 61 (4): 1190–95. doi:10.2136/sssaj1997.03615995006100040026x. Retrieved 24 December 2023.
  6. ^ "Restoring soils could remove up to '5.5bn tonnes' of greenhouse gases every year". Carbon Brief. London, United Kingdom. 2020-03-16. Retrieved 24 December 2023.
  7. ^ Ontl, Todd A.; Schulte, Lisa A. (2012). "Soil carbon storage". The Nature Education Knowledge Project. Cambridge, Massachusetts. Retrieved 24 December 2023.
  8. ^ "Organic matter in soil: overview of composition, distribution, and content". Ocean Agro LLC. Nandesari Vadodara, India. 2018. Retrieved 25 December 2023.
  9. ^ Bot, Alexandra; Benites, José (2005). "The importance of soil organic matter: key to drought-resistant soil and sustained food production. Chapter 1. Introduction". Food and Agriculture Organization of the United Nations. Rome, Italy. Retrieved 25 December 2023.
  10. ^ Mergel, A.; Timchenko, A.; Kudeyarov, V. (1998). "Role of plant root exudates in soil carbon and nitrogen transformation". In Box, James E. Jr. (ed.). Root demographics and their efficiencies in sustainable agriculture, grasslands and forest ecosystems. Developments in plant and soil sciences. Vol. 82. Dordrecht, The Netherlands: Springer. pp. 43–54. doi:10.1007/978-94-011-5270-9_3. ISBN 978-94-010-6218-3. Retrieved 31 December 2023.
  11. ^ Skjemstad, Jan O.; Reicosky, Donald C.; Wilts, Alan R.; McGowan, Janine A. (2002). "Charcoal carbon in U.S. agricultural soils". Soil Science Society of America Journal. 66 (4): 1249–55. Bibcode:2002SSASJ..66.1249S. doi:10.2136/sssaj2002.1249. Retrieved 31 December 2023.
  12. ^ Ochoa-Hueso, R; Delgado-Baquerizo, M; King, PTA; Benham, M; Arca, V; Power, SA (February 2019). "Ecosystem Type and Resource Quality Are More Important than Global Change Drivers in Regulating Early Stages of Litter Decomposition". Soil Biology and Biochemistry. 129: 144–52. doi:10.1016/j.soilbio.2018.11.009. hdl:10261/336676. S2CID 92606851.
  13. ^ Batjes, Niels H. (1996). "Total Carbon and Nitrogen in the Soils of the World". European Journal of Soil Science. 47 (2): 151–63. doi:10.1111/j.1365-2389.1996.tb01386.x.
  14. ^ Batjes, Niels H. (2016). "Harmonised Soil Property Values for Broad-Scale Modelling (WISE30sec) with Estimates of Global Soil Carbon Stocks". Geoderma. 269: 61–68. Bibcode:2016Geode.269...61B. doi:10.1016/j.geoderma.2016.01.034.
  15. ^ Lal, R. Soil Carbon Sequestration to Mitigate Climate Change. Geoderma, 123(1): 1–22 (2004).