Resource Details

Secondary forest regeneration under fast-growing forest plantations on degraded Imperata cylindrica grasslands

Literature: Journal Articles

Otsamo, R. 2000, Secondary forest regeneration under fast-growing forest plantations on degraded Imperata cylindrica grasslands, New Forests, vol. 19, pp. 69–93.

Contact Info

Email the author at riikka.otsamo@helsinki.fi

Affiliations

Department of Forest Ecology / Tropical Silviculture, University of Helsinki, Finland

Link(s)

Available from the publisher here.

Species Info

  • Acacia mangium
  • Gmelina arborea
  • Paraserianthes falcataria
  • Imperata cylindrica

Description

  • The author of this study compared the regeneration of native tree species under the canopy of tree plantations, riverine areas, and uncultivated grassland areas.
  • The study was conducted in the Riam Kiwa plantation area in South Kalimantan, Indonesia. This area has a distinct dry season and deeply weathered, acidic soils. The area is considered good for forest plantations.
  • The plantations areas were manually cleared of the I. cylindrica and plowed multiple times before the fast growing plantation species were planted.
  • The species composition and density of seedlings and saplings was assessed using a systematic line plot survey.
  • Under A. mangium and P. falcataria, species composition was similar with mostly pioneer and secondary species as well as some more common primary forest species.
  • The higher species composition under A. mangium and P. falcataria was likely a result of the not too heavy shade and fast decomposition of the leaf litter of these species.
  • Euphorbiaceae was the most family of seedlings and saplings found.
  • Seedling density was much lower in Gmelina arborea than under the other two plantation species.
  • Grass dominated areas had much lower recruitment than areas that lacked understory vegetation or were dominated by shrubs.
  • Diameter at breast height or basal area of trees did not have a significant effect on seedling or sapling density.
  • Weeding during the first two years prevented seedling establishment.
  • The results of this study show that commericial plantations could be used to facilitate forest restoration with native trees.
  • However, the understory would be damaged during the harvesting operation and with fast-growing species in the canopy it is unclear if the understory trees would be established enough to survive post-harvest.
  • This restoration strategy could be used in areas were reforestation important for other reasons, not just timber, to develop corridors for biodiversity, buffers for protected areas, or on steep hills or riparian zones. The forests that would grow up under the plantations would have many species of value for local communities for building, food, and other purposes.
  • The natural regeneration could help promote soil fertility and prevent soil erosion and the reestablishment of Imperata grass after harvesting.

Geographical Region

  • Insular Southeast Asia
  • Country

  • Indonesia
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