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Experientia

, Volume 43, Issue 3, pp 259–265 | Cite as

Litter production and decomposition in a terra-firme forest of Central Amazonia

  • F. J. Luizão
  • H. O. R. Schubart
Article

Summary

Chemical and biological aspects of litter production and decomposition were studied in three distinct areas of the Central Amazon. Litter production was measured during three years, employing the litter trap technique, with adapted conical collectors. Leaf litter decomposition was studied in experiments, over five-month-periods with repetitions for the dry and wet seasons, using the nylon-mesh bag technique. The greatest litter production took place during the drier period of the year, mainly from June to October, while decomposition processes were more accentuated in the wet season: in the plateau site, one-half, of the litter disappears, according to a mathematical model, in about, 218 days under dry season conditions as against 32 days in the wet season. In the rainy season, weight reduction and mineral losses from decomposing leaves occurred more rapidly, owing to the intense biological activity on the material during this period. Particularly noticeable was the intense activity of termites in organic matter breakdown and mineral removal, and the extensive root penetration in the decomposing leaves, which removed some minerals but increased the amounts of other. Leaching effects were also quite noticeable in this period. During the rainy season, in the latosol sites, termites were responsible for more than 40% of the removal of decomposing leaves. While intense biological activity appears to be the major factor responsible for weight reduction and loss of many minerals, as well as for the accumulation of some other minerals (mainly zinc iron and aluminium) in the decomposing material, leaching seems to be the major factor responsible for the loss of certain minerals such as potassium, boron and copper.

Key words

Litter litter decomposition nutrients cycle 

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Copyright information

© Birkhäuser Verlag 1987

Authors and Affiliations

  • F. J. Luizão
    • 1
  • H. O. R. Schubart
    • 1
  1. 1.Divisão de BioecologiaInstituto Nacional de Pesquisas da AmazôniaManausBrazil

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