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Nitrogen cycling in South American savannas

By: Material type: ArticleArticlePublication details: 1982ISSN:
  • 1573-5036 (Revista en electrónico)
Subject(s): DDC classification:
  • 83-899996
 In: Plant and Soil v. 67, no. 1, p. 293-30483-899996Summary: Savannas cover about 300 million hectares of South America. The soils are mainly oxisols and ultisols and their natural fertility is very low with high acidity. The natural vegetation varies in density and in the amount of biomass produced annually, which can be equal to that produced by forests in the region. Among the nitrogen-fixing micro-organisms, the only ones well-studied are Rhizobium bacteria. In managing the biomass in these areas, it is important to consider biological nitrogen-fixation as a possible source of nitrogen to replace that removed in crops. Nitrification and denitrification in these soils are intense but not well studied. The rainfall distribution during the growing season seems to have a considerable influence on the nitrogen supply to the soils. A considerable loss of nitrogen occurs in this environment when vast areas are burned annually
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40 ref.; Summaries (En, Es)

Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0032-079X

Savannas cover about 300 million hectares of South America. The soils are mainly oxisols and ultisols and their natural fertility is very low with high acidity. The natural vegetation varies in density and in the amount of biomass produced annually, which can be equal to that produced by forests in the region. Among the nitrogen-fixing micro-organisms, the only ones well-studied are Rhizobium bacteria. In managing the biomass in these areas, it is important to consider biological nitrogen-fixation as a possible source of nitrogen to replace that removed in crops. Nitrification and denitrification in these soils are intense but not well studied. The rainfall distribution during the growing season seems to have a considerable influence on the nitrogen supply to the soils. A considerable loss of nitrogen occurs in this environment when vast areas are burned annually

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Springer

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