Effect of Slash-and-burn on Nutrient Dynamics during the Intercropping Period of Taungya Teak Reforestation in the Bago Mountains, Myanmar

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Abstract

In the Bago Mountains of Myanmar, teak (<I>Tectona grandis</I> Linn.) reforestation using the taungya system has been in continuous operation for more than a century. Under this system, farmers who plant teak trees can cultivate intercrops between the rows of teak. In this region, secondary forests, especially bamboo-dominated forests, are usually slashed and burned to start a new taungya reforestation. To investigate the effect of the burning of bamboo-dominated forests on nutrient dynamics, changes in the soil nutrient status during the slash-and-burn and subsequent intercropping periods of taungya reforestation were examined quantitatively with particular focus on the effect of ash incorporation. After burning, approximately 85.1% of the aboveground biomass was lost and 4.2 t/ha of ash was produced. Although the loss of aboveground biomass was enormous, a significant increase in the amount of exchangeable K in the surface soil was observed. The nutrient dynamics in the soil were heavily influenced by the properties of the K-rich ash, which reflected the chemical composition of the original vegetation. The available P in the surface soil also increased due to a combination of the soil-heating effect and ash incorporation. The burning of bamboo-dominated forests confers certain advantages, including an increase in the amount of readily available essential nutrients such as K and P because bamboo ash contains a large amount of water-soluble K, and sufficient burning enhances the mineralization of organic P by the soil-heating effect.

Journal

  • Tropical Agriculture and Development

    Tropical Agriculture and Development 53(3), 82-89, 2009

    Japanese Society for Tropical Agriculture

Codes

  • NII Article ID (NAID)
    130004544154
  • NII NACSIS-CAT ID (NCID)
    AA12326645
  • Text Lang
    ENG
  • ISSN
    1882-8450
  • NDL Article ID
    10447483
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z78-A629
  • Data Source
    NDL  J-STAGE 
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