Earth:Chernozem

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Short description: Soil type; very fertile, black-coloured soil containing a high percentage of humus
Chernozem
Chernozemic soil
Mollisol.jpg
Mollisol (USDA-NRCS)
Used inWRB, other
WRB codeCH
ProfileAhBC
Parent materialLoess
ClimateHumid continental

Chernozem (from Russian: чернозём; "black ground"),[1][2] also called black soil, regur soil or black cotton soil, is a black-colored soil containing a high percentage of humus[3] (4% to 16%) and high percentages of phosphorus and ammonia compounds.[4] Chernozem is very fertile soil and can produce high agricultural yields with its high moisture storage capacity.[lower-alpha 1] Chernozems are a Reference Soil Group of the World Reference Base for Soil Resources (WRB)

Distribution

Distribution of chernozem soils according to the World Reference Base for Soil Resources classification:
  Dominant (more than 50% of soil cover)
  Codominant (25-50%)
  Associated (5-25%)

The name comes from the Russian terms for black and soil, earth or land (chorny + zemlya).[2][3] The soil, rich in organic matter presenting a black color, was first identified by the Russia geologist Vasily Dokuchaev in 1883 in the tallgrass steppe or prairie of Eastern Ukraine and Western Russia.

Chernozem cover about 230 million hectares of land. There are two "chernozem belts" in the world. One is the Eurasian steppe which extends from eastern Croatia (Slavonia), along the Danube (northern Serbia, northern Bulgaria (Danubian Plain), southern and eastern Romania (Wallachian Plain and Moldavian Plain), and Moldova, to northeast Ukraine across the Central Black Earth Region of Central and Southern Russia into Siberia. The other stretches from the Canadian Prairies in Manitoba through the Great Plains of the US as far south as Kansas.[5] Chernozem layer thickness may vary widely, from several centimetres up to 1.5 metres (60 inches) in Ukraine,[6] as well as the Red River Valley region in the Northern US and Canada (location of the prehistoric Lake Agassiz).

The terrain can also be found in small quantities elsewhere (for example, on 1% of Poland, Hungary, and Texas). It also exists in Northeast China, near Harbin. The only true chernozem in Australia is located around Nimmitabel, some of the richest soils on the continent.[7]

Previously, there was a black market for the soil in Ukraine. The sale of agricultural land has been illegal in Ukraine since 1992 until the ban was lifted in 2020,[8] but the soil, transported by truck, could be traded legally. According to the Kharkiv-based Green Front NGO, the black market for illegally-acquired chernozem in Ukraine was projected to reach approximately US$900 million per year in 2011.[9]

Canadian and United States soil classification

Chernozemic soils are a soil type in the Canadian system of soil classification and the World Reference Base for Soil Resources (WRB).

Chernozemic soil type "equivalents", in the Canadian system, WRB, and US Department of Agriculture soil taxonomy:

Canadian WRB United States
Chernozemic Kastanozem, Chernozem, Phaeozem Mollisol
Brown Chernozem Kastanozem (Aridic) Aridic Mollisol subgroups (Xerolls and Ustolls)
Dark Brown Chernozem Haplic Kastanozem Typic Mollisol subgroups
Black Chernozem Chernozem Udic Mollisol subgroups
Dark Grey Chernozem Greyzemic Phaeozem Boralfic Mollisol subgroups, Albolls
Source: Pedosphere.com .

History

Theories of Chernozem origin:

  • 1761: Johan Gottschalk Wallerius (plant decomposition)[10]
  • 1763: Mikhail Lomonosov (plant and animal decomposition)[11]
  • 1799: Peter Simon Pallas (reeds marsh)[citation needed]
  • 1835: Charles Lyell (loess)[12]
  • 1840: Sir Roderick Murchison (weathered from Jurassic marine shales)[12]
  • 1850: Karl Eichwald (peat)[citation needed]
  • 1851: А. Petzgold (swamps)
  • 1852: Nikifor Borisyak (peat)[citation needed]
  • 1853: Vangengeim von Qualen (silt from northern swamps)
  • 1862: Rudolf Ludwig (bog on place of forests)[citation needed]
  • 1866: Franz Josef Ruprecht (decomposed steppe grasses) [13]
  • 1879: First chernozem papers translated from Russian[14]
  • 1883: Vasily Dokuchaev published his book Russian Chernozem with a complete study of this soil in the European part of the Russian Empire.[15]
  • 1929: Otto Schlüter (man-made)[16]
  • 1999: Michael W. I. Schmidt (neolithic biomass burning)[17][18]

As seen in the list above, the 19th and 20th-century discussions on the pedogenesis of Chernozem originally stemmed from climatic conditions from the early Holocene to roughly 5500 BC. However, no single paleo-climate reconstruction could accurately explain geochemical variations found in Chernozems throughout central Europe. Evidence of anthropomorphic origins of stable pyrogenic carbon in Chernozem led to improved formation theories.[16] Vegetation burning could explain Chernozem's high magnetic susceptibility,[19] the highest of the major soil types.[20] Soil magnetism increases when soil minerals goethite and ferrihydrite convert to maghemite on exposure to heat.[21] Temperatures sufficient to elevate maghemite on a landscape scale indicates the influence of fire. Given the rarity of such natural phenomenon in the modern-day, magnetic susceptibility in Chernozem likely relates to control of fire by early humans.[20]

Humification can darken soils (melanization) absent a pyrogenic carbon component. Given the symphony of pedogenic processes that contribute to the formation of dark earth, the term Chernozem summarizes different types of black soils with the same appearance but different formation histories.

See also

Notes

  1. ↑ Prolonged use may still require replenishment with fertilizers because it easily can get depleted of nutrities.

References

  • IUSS Working Group WRB: World Reference Base for Soil Resources, fourth edition. International Union of Soil Sciences, Vienna 2022. ISBN:979-8-9862451-1-9 ([1]).
  1. ↑ (in en) Russia Investment and Business Guide. International Business Publications. 2007. p. 63. ISBN 9781433041686. https://books.google.com/books?id=BFC0zTM4TkAC&q=Chernozyom&pg=PA63. Retrieved 11 January 2018. [yes|permanent dead link|dead link}}]
  2. ↑ 2.0 2.1 "chernozem | Etymology, origin and meaning of chernozem by etymonline" (in en). https://www.etymonline.com/word/chernozem. 
  3. ↑ 3.0 3.1 "Chernozem". Merriam-Webster Online Dictionary. 2008. http://www.merriam-webster.com/dictionary/chernozem. 
  4. ↑ "How Chemical Pre-Treatments in Particle Size Analysis Impact Wind Erosion Modeling" (in en). AZoM.com. 28 July 2021. https://www.azom.com/article.aspx?ArticleID=20616. 
  5. ↑ Ecology of Arable Land – Perspectives and Challenges by M. Clarholm and L. Bergström ISBN:978-94-010-6950-2
  6. ↑ Ukraine: Soils in Encyclopædia Britannica
  7. ↑ KG McQueen. "The Tertiary Geology And Geomorphology Of The Monaro: The Perspective In 1994" Centre For Australian Regolith Studies, Canberra 1994
  8. ↑ "Ukraine lifts ban on sale of farmland in bid to receive international funds". 31 March 2020. https://www.euronews.com/2020/03/31/ukraine-lifts-ban-on-sale-of-farmland-in-bid-to-receive-international-funds. 
  9. ↑ Black market for rich black earth, Kyiv Post (9 November 2011)
  10. ↑ Wallerius J. G. Agriculturae fundamenta chemica, åkerbrukets chemiska grunder. Upsaliae, 1761. 8, 4, 322 p.; The natural and chemical elements of agriculture. London, York: Bell, Etherington, 1770. 198 p.
  11. ↑ 'Lomonosov M. V. § 125. // On the strata of the Earth: a translation of "O sloiakh zemnykh" (1763) / translated by S. M. Rowland, S. Korolev. Boulder: Geological Soc. of America, 2012. 41 p. (Special paper; 485) "And so, there is no doubt that black soil is not primordial matter, but that it has been produced by the decomposition of animal and plant bodies over time"
  12. ↑ 12.0 12.1 Geikie, A. (1875), Life of Sir Roderick I, Murchison, 1 
  13. ↑ Fedotova, Anastasia A. (August 2010), "The Origins of the Russian Chernozem Soil (Black Earth): Franz Joseph Ruprecht's 'Geo-Botanical Researches into the Chernozem' of 1866", Environment and History 16 (3): 271–293, doi:10.3197/096734010x519762, http://www.environmentandsociety.org/node/7607 
  14. ↑ Dokoutchaief B. Tchernozème (terre noire) de la Russie d'Europe. St.-Ptb.: Soc. Imp. libre économ., 1879. 66 p. (Comptes-rendus Soc. Imp. libre économ. T. 4).
  15. ↑ Dokuchaev V. V. Russian Chernozem (1883) // Israel Program for Scientific Translations Ltd. (for USDA-NSF), S. Monson, Jerusalem, 1967. (Translated from Russian into English by N. Kaner)
  16. ↑ 16.0 16.1 Eckmeier, Eileen; Gerlach, Renate; Gehrt, Ernst; Schmidt, Michael W.I. (2007), "Pedogenesis of Chernozems in Central Europe—A review", Geoderma 139 (3–4): 288–299, doi:10.1016/j.geoderma.2007.01.009, Bibcode: 2007Geode.139..288E, http://www.geo.unizh.ch/~mschmidt/downloads/Eckmeier_Geoderma_2007.pdf 
  17. ↑ Schmidt, M.W.I.; Skjemstad, J.O.; Jäger, C. (2002), "Carbon isotope geochemistry and nanomorphology of soil black carbon: Black chernozemic soils in central Europe originate from ancient biomass burning", Global Biogeochemical Cycles 16 (4): 70–1–70–8, doi:10.1029/2002GB001939, Bibcode: 2002GBioC..16.1123S, "These data challenge the common paradigm that chernozems are zonal soils with climate, parent material and bioturbation dominating soil formation, and introduce fire as a novel, important factor in the formation of these soils" 
  18. ↑ Eckmeier, E. (2007), Detecting prehistoric fire-based farming using biogeochemical markers, University of Zurich, Faculty of Science., doi:10.5167/uzh-3752, http://www.zora.uzh.ch/3752, "It is now an open question as to whether Neolithic settlers did indeed prefer to grow crops where Chernozems occurred or if Neolithic burning formed the chernozemic soils." 
  19. ↑ Eckmeier, Eileen; Gerlach, Renate; Gehrt, Ernst; Schmidt, Michael W.I. (2007), "Pedogenesis of Chernozems in Central Europe—A review", Geoderma 139 (3–4): 288–299, doi:10.1016/j.geoderma.2007.01.009, Bibcode: 2007Geode.139..288E, http://www.geo.unizh.ch/~mschmidt/downloads/Eckmeier_Geoderma_2007.pdf, "magnetic susceptibility of soil material may reflect past fires" 
  20. ↑ 20.0 20.1 Jordanova, Neli, ed (2017). "Chapter 8 - The discriminating power of soil magnetism for the characterization of different soil types". Soil Magnetism. Academic Press. pp. 349–365. doi:10.1016/B978-0-12-809239-2.00008-5. ISBN 978-0-12-809239-2. https://www.sciencedirect.com/science/article/pii/B9780128092392000085. "Chernozem soils exhibit similar features worldwide and are generally characterized by significant magnetic enhancement in the upper soil horizons." 
  21. ↑ Nørnberg, P.; Schwertmann, U.; Stanjek, H.; Andersen, T.; Gunnlaugsson, H.P. (2004). "Mineralogy of a burned soil compared with four anomalously red Quaternary deposits in Denmark". Clay Minerals 39 (1): 85–98. doi:10.1180/0009855043910122. Bibcode: 2004ClMin..39...85N. https://pubs.geoscienceworld.org/claymin/article-abstract/39/1/85/56468/Mineralogy-of-a-burned-soil-compared-with-four?redirectedFrom=fulltext. 

Further reading

  • W. Zech, P. Schad, G. Hintermaier-Erhard: Soils of the World. Springer, Berlin 2022, Chapter 5.3.2. ISBN:978-3-540-30460-9

External links



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