Tag: black dirt

Terra Preta | Amazonian Black Earth

A former worker at a plant farm in East Texas who was from the mountains of Mexico showed me a process that he believed made for the best area for a garden. His suggestion:

Dig a hole about 4 foot down then fill with wood, burn it, enjoy the time, then when you go to put it out, put wood on the coals, cover with the dirt again, go to bed. Go back and dig out the dirt, then the charcoal. If it is all carbon then just add good, clean, ph balanced water to it and see if an oily sheen is on the top of the water surface, and how quickly it drains out. IF No sheen of rainbow and the water takes a good while to drain, then it is good to return the charcoal to the soaked area, add “ready made compost rich” (living) soil on top, (or breathable fabric bag full of living soil.) Then add your young plant or group of plants to the hole.

Brazilian Charcoal Making Buildings-1930
Brazilian Charcoal Making Buildings-1930

This method has proven to be a great success for non-row farming in raised bed type gardening.

There are several ways to add carbon to the soil, as well as many other things that could be added in this process, and it is interesting to note that Native Americans have been doing something similar for a very long time.

Terra preta (Portuguese pronunciation: [ˈtɛʁɐ ˈpɾetɐ], locally [ˈtɛhɐ ˈpɾetɐ], literally "black soil" in Portuguese) is a type of very dark, fertile artificial (anthropogenic) soil found in the Amazon Basin. It is also known as "Amazonian dark earth" or "Indian black earth". In Portuguese its full name is terra preta do índio or terra preta de índio ("black soil of the Indian", "Indians' black earth"). Terra mulata ("mulatto earth") is lighter or brownish in color.[1]

Homemade terra preta, with charcoal pieces indicated using white arrows

Terra preta owes its characteristic black color to its weathered charcoal content,[2] and was made by adding a mixture of charcoal, bone, broken pottery, compost and manure to the low fertility Amazonian soil. A product of indigenous soil management and slash-and-char agriculture,[3] the charcoal is stable and remains in the soil for thousands of years, binding and retaining minerals and nutrients.[4][5]

Terra preta is characterized by the presence of low-temperature charcoal residues in high concentrations;[2] of high quantities of tiny pottery shards; of organic matter such as plant residues, animal feces, fish and animal bones, and other material; and of nutrients such as nitrogen, phosphorus, calcium, zinc and manganese.[6] Fertile soils such as terra preta show high levels of microorganic activities and other specific characteristics within particular ecosystems.

Terra preta zones are generally surrounded by terra comum ([ˈtɛhɐ koˈmũ] or [ˈtɛhɐ kuˈmũ]), or "common soil"; these are infertile soils, mainly acrisols,[6] but also ferralsols and arenosols.[7] Deforested arable soils in the Amazon are productive for a short period of time before their nutrients are consumed or leached away by rain or flooding. This forces farmers to migrate to an unburned area and clear it (by fire).[8][9] Terra preta is less prone to nutrient leaching because of its high concentration of charcoal, microbial life and organic matter. The combination accumulates nutrients, minerals and microorganisms and withstands leaching.

Terra preta soils were created by farming communities between 450 BCE and 950 CE.[10][11][12] Soil depths can reach 2 meters (6.6 ft). It is reported to regenerate itself at the rate of 1 centimeter (0.4 in) per year.[13]

History

Early theories

The origins of the Amazonian dark earths were not immediately clear to later settlers. One idea was that they resulted from ashfall from volcanoes in the Andes, since they occur more frequently on the brows of higher terraces. Another theory considered its formation to be a result of sedimentation in tertiary lakes or in recent ponds.[citation needed]

Anthropogenic roots

Soils with elevated charcoal content and a common presence of pottery remains can accrete accidentally near living quarters as residues from food preparation, cooking fires, animal and fish bones, broken pottery, etc., accumulated. Many terra preta soil structures are now thought to have formed under kitchen middens, as well as being manufactured intentionally on larger scales.[14] Farmed areas around living areas are referred to as terra mulata. Terra mulata soils are more fertile than surrounding soils but less fertile than terra preta, and were most likely intentionally improved using charcoal.[citation needed]

This type of soil appeared between 450 BCE and 950 CE at sites throughout the Amazon Basin.[12] Recent research has reported that terra preta may be of natural origin, suggesting that pre-Columbian people intentionally utilized and improved existing areas of soil fertility scattered among areas of lower fertility.[15]

Amazonia

Amazonians formed complex, large-scale social formations, including chiefdoms (particularly in the inter-fluvial regions) and even large towns and cities.[16] For instance, the culture on the island of Marajó may have developed social stratification and supported a population of 100,000. Amazonians may have used terra preta to make the land suitable for large-scale agriculture.[17]

Spanish explorer Francisco de Orellana was the first European to traverse the Amazon River in the 16th century. He reported densely populated regions extending hundreds of kilometres along the river, suggesting population levels exceeding even those of today. Orellana may have exaggerated the level of development, although that is disputed. The evidence to support his claim comes from the discovery of geoglyphs dating between 0–1250 CE and from terra preta.[18][19] Beyond the geoglyphs, these populations left no lasting monuments, possibly because they built with wood, which would have rotted in the humid climate, as stone was unavailable.[citation needed]

Whatever its extent, this civilization vanished after the demographic collapse of the 16th and 17th century, due to European-introduced diseases such as smallpox[19] and bandeirante slave-raiding.[20] The settled agrarians again became nomads, while still maintaining specific traditions of their settled forbears. Their semi-nomadic descendants have the distinction among tribal indigenous societies of a hereditary, yet landless, aristocracy, a historical anomaly for a society without a sedentary, agrarian culture.[citation needed]

Moreover, many indigenous peoples adapted to a more mobile lifestyle to escape colonialism. This might have made the benefits of terra preta, such as its self-renewing capacity, less attractive: farmers would not have been able to cultivate the renewed soil as they migrated. Slash-and-char agriculture may have been an adaptation to these conditions. For 350 years after the European arrival, the Portuguese portion of the basin remained untended.[citation needed]

Location

Terra preta soils are found mainly in the Brazilian Amazon, where Sombroek et al.[21] estimate that they cover at least 0.1 to 0.3%, or 6,300 to 18,900 square kilometres (2,400 to 7,300 sq mi) of low forested Amazonia;[1] but others estimate this surface at 10.0% or more (twice the area of Great Britain).[13][22] Recent model-based predictions suggest that the extent of terra preta soils may be of 3.2% of the forest.[23]

Terra preta exists in small plots averaging 20 hectares (49 acres), but areas of almost 360 hectares (890 acres) have also been reported. They are found among various climatic, geological, and topographical situations.[1] Their distributions either follow main water courses, from East Amazonia to the central basin,[24] or are located on interfluvial sites (mainly of circular or lenticular shape) and of a smaller size averaging some 1.4 hectares (3.5 acres), (see distribution map of terra preta sites in Amazon basin[25] The spreads of tropical forest between the savannas could be mainly anthropogenic—a notion with dramatic implications worldwide for agriculture and conservation.[26]

Terra preta sites are also known in the Llanos de Moxos of Bolivia, Ecuador, Peru and French Guiana,[27][28] and on the African continent in Benin, Liberia, and the South African savannas.[6]

Pedology

In the international soil classification system World Reference Base for Soil Resources (WRB) Terra preta is called Pretic Anthrosol. The most common original soil before transformed into a terra preta is the Ferralsol. Terra preta has a carbon content ranging from high to very high (more than 13–14% organic matter) in its A horizon, but without hydromorphic characteristics.[29] Terra preta presents important variants. For instance, gardens close to dwellings received more nutrients than fields farther away.[30] The variations in Amazonian dark earths prevent clearly determining whether all of them were intentionally created for soil improvement or whether the lightest variants are a by-product of habitation.[citation needed]

Terra preta's capacity to increase its own volume—thus to sequester more carbon—was first documented by pedologist William I. Woods of the University of Kansas.[13] This remains the central mystery of terra preta.[citation needed]

The processes responsible for the formation of terra preta soils are:[7]

  • Incorporation of wood charcoal
  • Incorporation of organic matter and of nutrients
  • Growth of microorganisms and animals in the soil

Wood charcoal

The transformation of biomass into charcoal produces a series of charcoal derivatives known as pyrogenic or black carbon, the composition of which varies from lightly charred organic matter, to soot particles rich in graphite formed by recomposition of free radicals.[31][32] All types of carbonized materials are called charcoal. By convention, charcoal is considered to be any natural organic matter transformed thermally or by a dehydration reaction with an oxygen/carbon (O/C) ratio less than 60;[31] smaller values have been suggested.[33] Because of possible interactions with minerals and organic matter from the soil, it is almost impossible to identify charcoal by determining only the proportion of O/C. The hydrogen/carbon percentage[34] or molecular markers such as benzenepolycarboxylic acid,[35] are used as a second level of identification.[7]

Indigenous people added low temperature charcoal to poor soils. Up to 9% black carbon has been measured in some terra preta (against 0.5% in surrounding soils).[36] Other measurements found carbon levels 70 times greater than in surrounding ferralsols,[7] with approximate average values of 50 Mg/ha/m.[37]

The chemical structure of charcoal in terra preta soils is characterized by poly-condensed aromatic groups that provide prolonged biological and chemical stability against microbial degradation; it also provides, after partial oxidation, the highest nutrient retention.[7][37] Low temperature charcoal (but not that from grasses or high cellulose materials) has an internal layer of biological petroleum condensates that the bacteria consume, and is similar to cellulose in its effects on microbial growth.[38] Charring at high temperature consumes that layer and brings little increase in soil fertility.[13] The formation of condensed aromatic structures depends on the method of manufacture of charcoal.[35][39][40] The slow oxidation of charcoal creates carboxylic groups; these increase the cation exchange capacity of the soil.[41][42] The nucleus of black carbon particles produced by the biomass remains aromatic even after thousands of years and presents the spectral characteristics of fresh charcoal. Around that nucleus and on the surface of the black carbon particles are higher proportions of forms of carboxylic and phenolic carbons spatially and structurally distinct from the particle's nucleus. Analysis of the groups of molecules provides evidences both for the oxidation of the black carbon particle itself, as well as for the adsorption of non-black carbon.[43]

This charcoal is thus decisive for the sustainability of terra preta.[41][44] Amending ferralsol with wood charcoal greatly increases productivity.[24] Globally, agricultural lands have lost on average 50% of their carbon due to intensive cultivation and other damage of human origin.[13]

Fresh charcoal must be "charged" before it can function as a biotope.[45] Several experiments demonstrate that uncharged charcoal can bring a temporary depletion of available nutrients when first put into the soil, that is until its pores fill with nutrients. This is overcome by soaking the charcoal for two to four weeks in any liquid nutrient (urine, plant tea, etc.).[citation needed]

Organic matter and nutrients

Charcoal's porosity brings better retention of organic matter, of water and of dissolved nutrients,[41][46] as well as of pollutants such as pesticides and aromatic poly-cyclic hydrocarbons.[47]

Organic matter

Charcoal's high absorption potential of organic molecules (and of water) is due to its porous structure.[7] Terra preta's high concentration of charcoal supports a high concentration of organic matter (on average three times more than in the surrounding poor soils),[7][37][42][48] up to 150 g/kg.[24] Organic matter can be found at 1 to 2 metres (3 ft 3 in to 6 ft 7 in) deep.[29]

Bechtold proposes to use terra preta for soils that show, at 50 centimeters (20 in) depth, a minimum proportion of organic matter over 2.0-2.5%. The accumulation of organic matter in moist tropical soils is a paradox, because of optimum conditions for organic matter degradation.[37] It is remarkable that anthrosols regenerate in spite of these tropical conditions' prevalence and their fast mineralisation rates.[24] The stability of organic matter is mainly because the biomass is only partially consumed.[37]

Nutrients

Terra preta soils also show higher quantities of nutrients, and a better retention of these nutrients, than surrounding infertile soils.[37] The proportion of P reaches 200–400 mg/kg.[49] The quantity of N is also higher in anthrosol, but that nutrient is immobilized because of the high proportion of C over N in the soil.[24]

Anthrosol's availability of P, Ca, Mn and Zn is higher than ferrasol. The absorption of P, K, Ca, Zn, and Cu by the plants increases when the quantity of available charcoal increases. The production of biomass for two crops (rice and Vigna unguiculata) increased by 38–45% without fertilization (P < 0.05), compared to crops on fertilized ferralsol.[24]

Amending with charcoal pieces approximately 20 millimeters (0.79 in) in diameter, instead of ground charcoal, did not change the results except for manganese (Mn), for which absorption considerably increased.[24]

Nutrient leaching is minimal in this anthrosol, despite their abundance, resulting in high fertility. When inorganic nutrients are applied to the soil, however, the nutrients' drainage in anthrosol exceeds that in fertilized ferralsol.[24]

As potential sources of nutrients, only C (via photosynthesis) and N (from biological fixation) can be produced in situ. All the other elements (P, K, Ca, Mg, etc.) must be present in the soil. In Amazonia, the provisioning of nutrients from the decomposition of naturally available organic matter fails as the heavy rainfalls wash away the released nutrients and the natural soils (ferralsols, acrisols, lixisols, arenosols, uxisols, etc.) lack the mineral matter to provide those nutrients. The clay matter that exists in those soils is capable of holding only a small fraction of the nutrients made available from decomposition. In the case of terra preta, the only possible nutrient sources are primary and secondary. The following components have been found:[37]

Saturation in pH and in base is more important than in the surrounding soils.[49][50]

Microorganisms and animals

The peregrine earthworm Pontoscolex corethrurus (Oligochaeta: Glossoscolecidae) ingests charcoal and mixes it into a finely ground form with the mineral soil. P. corethrurus is widespread in Amazonia and notably in clearings after burning processes thanks to its tolerance of a low content of organic matter in the soil.[51] This as an essential element in the generation of terra preta, associated with agronomic knowledge involving layering the charcoal in thin regular layers favorable to its burying by P. corethrurus.[citation needed]

Some ants are repelled from fresh terra preta; their density is found to be low about 10 days after production compared to that in control soils.[52]

Modern research on creating terra preta

Synthetic terra preta

A newly coined term is 'synthetic terra preta’.[53][54] STP is a fertilizer consisting of materials thought to replicate the original materials, including crushed clay, blood and bone meal, manure and biochar[53] is of particulate nature and capable of moving down the soil profile and improving soil fertility and carbon in the current soil peds and aggregates over a viable time frame.[55] Such a mixture provides multiple soil improvements reaching at least the quality of terra mulata. Blood, bone meal and chicken manure are useful for short term organic manure addition.[56] Perhaps the most important and unique part of the improvement of soil fertility is carbon, thought to have been gradually incorporated 4 to 10 thousand years ago.[57] Biochar is capable of decreasing soil acidity and if soaked in nutrient rich liquid can slowly release nutrients and provide habitat for microbes in soil due to its high porosity surface area.[2]

The goal is an economically viable process that could be included in modern agriculture. Average poor tropical soils are easily enrichable to terra preta nova by the addition of charcoal and condensed smoke.[58] Terra preta may be an important avenue of future carbon sequestration while reversing the current worldwide decline in soil fertility and associated desertification. Whether this is possible on a larger scale has yet to be proven. Tree Lucerne (tagasaste or Cytisus proliferus) is one type of fertilizer tree used to make terra preta. Efforts to recreate these soils are underway by companies such as Embrapa and other organizations in Brazil.[59]

Synthetic terra preta is produced at the Sachamama Center for Biocultural Regeneration in High Amazon, Peru. This area has many terra preta soil zones, demonstrating that this anthrosol was created not only in the Amazon basin, but also at higher elevations.[60]

A synthetic terra preta process was developed by Alfons-Eduard Krieger to produce a high humus, nutrient-rich, water-adsorbing soil.[61]

Terra preta sanitation

Terra preta sanitation (TPS) systems have been studied as an alternative sanitation option by using the effects of lactic-aid conditions in urine-diverting dry toilets and a subsequent treatment by vermicomposting.[62]

See also

Notes

  1. ^ a b c Denevan, William M.; Woods, William I. "Discovery and awareness of anthropogenic amazonian dark earths (terra preta)" (PDF). Archived from the original (PDF) on 24 September 2015.
  2. ^ a b c Mao, J.-D.; Johnson, R. L.; Lehmann, J.; Olk, J.; Neeves, E. G.; Thompson, M. L.; Schmidt-Rohr, K. (2012). "Abundant and stable char residues in soils: implications for soil fertility and carbon sequestration". Environmental Science and Technology. 46 (17): 9571–9576. Bibcode:2012EnST...46.9571M. CiteSeerX 10.1.1.698.270. doi:10.1021/es301107c. PMID 22834642. Terra Preta soils consist predominantly of char residues composed of ~6 fused aromatic rings
  3. ^ Dufour, Darna L. (October 1990). "Use of Tropical Rainforests by Native Amazonians". BioScience. 40 (9): 652–659. doi:10.2307/1311432. ISSN 0006-3568. JSTOR 1311432. Much of what has been considered natural forest in Amazonia is probably the result of hundreds of years of human use and management.
    Rival, Laura (1993). "The Growth of Family Trees: Understanding Huaorani Perceptions of the Forest". Man. 28 (4): 635–652. doi:10.2307/2803990. JSTOR 2803990.
  4. ^ Kleiner, Kurt (2009). "The bright prospect of biochar : article : Nature Reports Climate Change". Nature.com. 1 (906): 72–74. doi:10.1038/climate.2009.48.
  5. ^ Cornell University (1 March 2006). "Amazonian Terra Preta Can Transform Poor Soil into Fertile". Science Daily. Rockville, MD.
  6. ^ a b c Glaser, Bruno. "Terra Preta Web Site". Archived from the original on 25 October 2005.
  7. ^ a b c d e f g Glaser 2007.
  8. ^ Watkins and Griffiths, J. (2000). Forest Destruction and Sustainable Agriculture in the Brazilian Amazon: a Literature Review (Doctoral dissertation, The University of Reading, 2000). Dissertation Abstracts International, 15–17
  9. ^ Williams, M. (2006). Deforesting the Earth: From Prehistory to Global Crisis (Abridged ed.). Chicago, IL: The University of Chicago Press. ISBN 978-0-226-89947-3.
  10. ^ Neves 2001, p. 10.
  11. ^ Neves, E.G.; Bartone, R.N.; Petersen, J.B.; Heckenberger, M.J. (2001). The timing of Terra Preta formation in the central Amazon: new data from three sites in the central Amazon. p. 10.
  12. ^ a b Lehmann, J.; Kaampf, N.; Woods, W.I.; Sombroek, W.; Kern, D.C.; Cunha, T.J.F. "Historical Ecology and Future Explorations". p. 484. in Lehmann et al. 2007
  13. ^ a b c d e Day, Danny (2004). "Carbon negative energy to reverse global warming". Eprida.
  14. ^ Kawa, Nicholas C. (10 May 2016). Amazonia in the Anthropocene: People, Soils, Plants, Forests. University of Texas Press. ISBN 9781477308448.
  15. ^ Silva, Lucas C. R.; Corrêa, Rodrigo Studart; Wright, Jamie L.; Bomfim, Barbara; Hendricks, Lauren; Gavin, Daniel G.; Muniz, Aleksander Westphal; Martins, Gilvan Coimbra; Motta, Antônio Carlos Vargas; Barbosa, Julierme Zimmer; Melo, Vander de Freitas (4 January 2021). "A new hypothesis for the origin of Amazonian Dark Earths". Nature Communications. 12 (1): 127. doi:10.1038/s41467-020-20184-2. ISSN 2041-1723. PMC 7782733.
  16. ^ Mann 2005, p. 296.
  17. ^ Mann 2005.
  18. ^ Romero, Simon (14 January 2012). "Once Hidden by Forest, Carvings in Land Attest to Amazon's Lost World". The New York Times.
  19. ^ a b "Unnatural Histories - Amazon". BBC Four.
  20. ^ Wilkinson, David (4/1/2016). "Amazonian Civilization?". Comparative Civilizations Review. 74: 1–15 – via Brigham Young University's ScholarsArchive. {{cite journal}}: Check date values in: |date= (help)
  21. ^ Lehmann, J.; Kaempf, N.; Woods, W.I.; Sombroek, W.; Kern, D.C.; Cunha, T.J.F. "Classification of Amazonian Dark Earths and other Ancient Anthropic Soils". pp. 77–102. in Lehmann et al. 2007
  22. ^ Mann 2002 extract quoted here Archived 27 February 2008 at the Wayback Machine.
  23. ^ McMichael, C. H.; Palace, M. W; Bush, M. B.; Braswell, B.; Hagen, S.; Neves, E.G.; Silman, M. R.; Tamanaha, E. K.; Czarnecki, C. (2014). "Predicting pre-Columbian anthropogenic soils in Amazonia". Proceedings of the Royal Society B: Biological Sciences. 281 (20132475): 1–9. doi:10.1098/rspb.2013.2475. PMC 3896013. PMID 24403329.
  24. ^ a b c d e f g h Lehmann, J.; Pereira da Silva Jr., J.; Steiner, C.; Nehls, T.; Zech, W.; Glaser, Bruno (2003). "Nutrient availability and leaching in an archaeological Anthrosol and a Ferralsol of the Central Amazon basin: fertilizer, manure and charcoal amendments" (PDF). Plant and Soil. 249 (2): 343–357. doi:10.1023/A:1022833116184. S2CID 2420708.
  25. ^ Bechtold, G. "Terra Preta Sites". www.gerhardbechtold.com. Retrieved 4 August 2018.
  26. ^ Mann, Charles C. (4 February 2000). "Earthmovers of the Amazon". Science. 287 (5893): 1148–1152. doi:10.1126/science.321.5893.1148. PMID 18755950. S2CID 206581907. Archaeological research in the Beni area, directly linked with the recent renewal of interest on terra preta, as well as photographs of experimental reconstructions of that mode of agriculture.
  27. ^ Mandin, Marie-Laure (January 2005). "Vivre en Guyane" - compte rendu succint de découverte de sites de Terra preta en Guyane" [Living in French Guiana - summary report discovery of terra preta sites in French Guiana] (PDF) (in French). Archived from the original (PDF) on 23 July 2013.
  28. ^ Walker, John H. (2011), "Amazonian Dark Earth and Ring Ditches in the Central Llanos de Mojos, Bolivia," Culture, Agriculture, Food and Environment, Vol 33, No 1, pp 2.
  29. ^ a b Bechtold, Gerhard. "Gerhard Bechtold: Terra Preta". www.gerhardbechtold.com. Retrieved 5 August 2018.
  30. ^ Harder, Ben (4 March 2006). "Smoldered-Earth Policy". Science News. 169 (9): 133. doi:10.2307/3982299. ISSN 0036-8423. JSTOR 3982299.
  31. ^ a b Hedges, J.I; Eglinton, G; Hatcher, P.G; Kirchman, D.L; Arnosti, C; Derenne, S; Evershed, R.P; Kögel-Knabner, I; de Leeuw, J.W (October 2000). "The molecularly-uncharacterized component of nonliving organic matter in natural environments". Organic Geochemistry. 31 (10): 945–958. doi:10.1016/s0146-6380(00)00096-6. ISSN 0146-6380.
  32. ^ Cited in Glaser 2007.
  33. ^ Stoffyn-Egli, P.; Potter, T.M.; Leonard, J.D.; Pocklington, R. (May 1997). "The identification of black carbon particles with the analytical scanning electron microscope: methods and initial results". Science of the Total Environment. 198 (3): 211–223. Bibcode:1997ScTEn.198..211S. doi:10.1016/s0048-9697(97)05464-8. ISSN 0048-9697. Cited in Glaser 2007.
  34. ^ Kim, Sunghwan; Kaplan, Louis A.; Benner, Ronald; Hatcher, Patrick G. (December 2004). "Hydrogen-deficient molecules in natural riverine water samples—evidence for the existence of black carbon in DOM". Marine Chemistry. 92 (1–4): 225–234. doi:10.1016/j.marchem.2004.06.042. ISSN 0304-4203. Cited in Glaser 2007.
  35. ^ a b Glaser, B; Haumaier, L; Guggenberger, G; Zech, W (January 1998). "Black carbon in soils: the use of benzenecarboxylic acids as specific markers". Organic Geochemistry. 29 (4): 811–819. doi:10.1016/s0146-6380(98)00194-6. ISSN 0146-6380. Cited in Glaser 2007
  36. ^ Woods, William I.; McCann, Joseph M. (1999). "The Anthropogenic Origin and Persistence of Amazonian Dark Earths". Yearbook. Conference of Latin Americanist Geographers. 25: 7–14. JSTOR 25765871. Cited in Marris 2006
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  38. ^ Steiner, Christoph. Plant nitrogen uptake doubled in charcoal amended soils. Energy with Agricultural Carbon Utilization Symposium, 2004.
  39. ^ Guggenberger, G.; Zech, W. "Organic chemistry studies on Amazonian Dark Earths". in Lehmann et al. 2007
  40. ^ Brodowski, S.; Rodionov, A.; Haumaier, L.; Glaser, B.; Amelung, W. (September 2005). "Revised black carbon assessment using benzene polycarboxylic acids". Organic Geochemistry. 36 (9): 1299–1310. doi:10.1016/j.orggeochem.2005.03.011. ISSN 0146-6380.
  41. ^ a b c Glaser, Bruno; Haumaier, Ludwig; Guggenberger, Georg; Zech, Wolfgang (4 August 2018). "Stability of soil organic matter in Terra Preta soils Stabilité de la matière organique dans les sols de Terra Preta". Institut de Sciences des Sols, University of Bayreuth. {{cite journal}}: Cite journal requires |journal= (help)
  42. ^ a b Zech, W.; Haumaier, L.; Hempfling, R. (1990). "Ecological aspects of soil organic matter in tropical land use". In MacCarthy, Patrick (ed.). Humic substances in soil and crop sciences: selected readings : proceedings of a symposium cosponsored by the International Humic Substances Society ... Chicago, Illinois, 2 December 1985. American Society of Agronomy and Soil Science Society of America. pp. 187–202. ISBN 9780891181040. Cited in Glaser 2007.
  43. ^ Lehmann, Johannes; Liang, Biqing; Solomon, Dawit; Lerotic, Mirna; Luizão, Flavio; Kinyangi, James; Schäfer, Thorsten; Wirick, Sue; Jacobsen, Chris (16 February 2005). "Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy for mapping nano-scale distribution of organic carbon forms in soil: Application to black carbon particles". Global Biogeochemical Cycles. 19 (1): GB1013. Bibcode:2005GBioC..19.1013L. doi:10.1029/2004gb002435. ISSN 0886-6236.
  44. ^ Lehmann, Johannes; Silva Junior, José; Rondon, Marco; Manoel Da Silva, Cravo; Greenwood, Jaqueline; Nehls, Thomas; Steiner, Christoph; Glaser, Bruno (1 January 2002). "Slash and Char: a feasible alternative for soil fertility management in the Central Amazon?". {{cite journal}}: Cite journal requires |journal= (help)
  45. ^ Günther, Folke. "Folke Günther on ecological design,thermodynamics of living systems,ecological engineering, nutrient recycling and oil depletion". www.holon.se. Retrieved 5 August 2018.
  46. ^ Pietikainen, Janna; Kiikkila, Oili; Fritze, Hannu (May 2000). "Charcoal as a habitat for microbes and its effect on the microbial community of the underlying humus". Oikos. 89 (2): 231–242. doi:10.1034/j.1600-0706.2000.890203.x. ISSN 0030-1299. Cited in Glaser 2007.
  47. ^ Kopytko, M.; Chalela, G.; Zauscher, F. (2002). "Biodegradation of two commercial herbicides (Gramoxone and Matancha) by the bacteria Pseudomonas putida". Electronic Journal of Biotechnology. 5 (2): 182–195. doi:10.2225/vol5-issue2-fulltext-1. Cited in Glaser 2007.
  48. ^ Sombroek 1966, p. 283 Cited in Glaser 2007.
  49. ^ a b Lehmann, Johannes.som "Site Terra Preta de Índio - Soil Biogeochemistry", Cornell University.
  50. ^ Sombroek 1966; Smith, 1980; Kern and Kämpf, 1989; Sombroek, Nachtergaele & Hebel 1993; Glaser et al. 2007; Lehmann et al. 2007; Liang et al. 2006
  51. ^ Jean-François Ponge; Stéphanie Topoliantz; Sylvain Ballof; Jean-Pierre Rossi; Patrick Lavelle; Jean-Marie Betsch; Philippe Gaucher (2006). "Ingestion of charcoal by the Amazonian earthworm Pontoscolex corethrurus: a potential for tropical soil fertility" (PDF). Soil Biology and Biochemistry. 38 (7): 2008–2009. doi:10.1016/j.soilbio.2005.12.024.
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References

External links

source: https://en.wikipedia.org/wiki/Terra_preta