African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6638

Full Length Research Paper

Litter production in a natural stand of Brazil nut trees (Bertholletia excelsa Bonpl.)

Quêzia Leandro de Moura Guerreiro
  • Quêzia Leandro de Moura Guerreiro
  • Graduate Program in Environmental Sciences, Federal University of Pará, Brazil.
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Raimundo Cosme de Oliveira Júnior
  • Raimundo Cosme de Oliveira Júnior
  • East Amazon Agroforestry Research Center, Brazilian Agricultural Research Corporation, Brazil.
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Maria de Lourdes Pinheiro Ruivo
  • Maria de Lourdes Pinheiro Ruivo
  • Department of Earth Sciences and Ecology, Emílio Goeldi Museum, Brazil.
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Katia Emidio da Silva
  • Katia Emidio da Silva
  • Agroforestry Research Center of the Western Amazon, Brazilian Agricultural Research Corporation, Brazil.
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Troy Patrick Beldini
  • Troy Patrick Beldini
  • Institute of Biodiversity and Forests, Federal University of Western Pará, Brazil.
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Marcelino Carneiro Guedes
  • Marcelino Carneiro Guedes
  • Amapá Agroforestry Research Center, Brazilian Agricultural Research Corporation, Brazil.
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Amanda Fabricia Leão Mota
  • Amanda Fabricia Leão Mota
  • Institute of Science and Technology of Natural Water Resources, Federal University of Western Pará, Brazil.
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Brenda Lohana Teixeira de Moraes
  • Brenda Lohana Teixeira de Moraes
  • Institute of Science and Technology of Natural Water Resources, Federal University of Western Pará, Brazil.
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Paulo Roberto Brasil Santos
  • Paulo Roberto Brasil Santos
  • Institute of Science and Technology of Natural Water Resources, Federal University of Western Pará, Brazil.
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Izabela Moura Duin
  • Izabela Moura Duin
  • Bacteriologia Labor, Agronomic Institute of Parana, Brazil.
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  •  Received: 03 November 2017
  •  Accepted: 10 January 2018
  •  Published: 01 February 2018

Abstract

This research estimated litter production and analyzed its relation to environmental variables such as maximum temperature, insolation, and rainfall. The study was conducted on a 300 × 300 m experiment as part of the project titled mapping of native Brazil nut stands and socio-environmental and economic characterization of Brazil nut production systems (MapCast), in the Tapajós National Forest (FLONA Tapajós). Every 30 days for one full year (August 2015 to July 2016), litterfall was collected and stored in a laboratory. After drying, the material was separated into leaves, wood, flowers and fruits, and miscellaneous and weighed. Statistical tests conducted were Shapiro-Wilk (5%), Principal coordinate analysis, t-test, Pearson’s linear correlation, cross-correlation, and canonical redundancy analysis. Rainfall and temperature data were inferior and superior, respectively, to normal climate conditions in the region, and data for solar insolation had an abnormal pattern compared to normal climate conditions. Leaf production varied between 169.9 and 965.6 kg ha-1 month-1, and that of wood between 26.7 and 501.3 kg ha-1 month-1, while that for flowers and fruit varied from 0.6 to 19.6 kg ha-1 month-1. The greatest leaf production was measured during the months with the lowest amount of rainfall and highest temperatures, and variation in leaf production and total litterfall was partially explained by temperature and insolation.

Key words: Litter, Bertholletia excelsa, Amazon, El Niño, FLONA Tapajós.