Site conditions for regeneration of Hopea odorata in natural evergreen dipterocarp forest in Southern Vietnam

Dong T. L., . and Beadle C. L., . and Doyle R., . and Worledge D., . Site conditions for regeneration of Hopea odorata in natural evergreen dipterocarp forest in Southern Vietnam. pp. 532-542. ISSN 0128-1283

Matching species to suitable sites is important in reforestation. This study investigated the site conditions that support regeneration of Hopea odorata a valuable timber species in a secondary evergreen natural forest. Stand structure light intensity at seedling level and soil condition were examined in three representative 50 50 m plots. The upper canopy was dominated by four dipterocarps: H. odorata Shorea roxburghii Anisoptera costata and Dipterocarpus alatus. The prevailing stand structure supported vigorous germination but not development of seedlings of all four species. Low light levels near the forest floor were the major constraint on seedling development of H. odorata. There was no regeneration when the mean per cent transmitted incident daily photosynthetic active radiation (PAR) was 2.2; seedling germination but not development was supported when PAR was 6.6; regeneration and development occurred when PAR was 11.4. The soils were slightly acidic with low clay and high sand contents and low nutrient concentration but this was apparently not a constraint on growth given adequate light conditions. The results suggest that the re-establishment of H. odorata on degraded sites using nurse crops should be possible provided that high levels of shading are avoided.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v26n4/53...

Abstract

Matching species to suitable sites is important in reforestation. This study investigated the site conditions that support regeneration of Hopea odorata a valuable timber species in a secondary evergreen natural forest. Stand structure light intensity at seedling level and soil condition were examined in three representative 50 50 m plots. The upper canopy was dominated by four dipterocarps: H. odorata Shorea roxburghii Anisoptera costata and Dipterocarpus alatus. The prevailing stand structure supported vigorous germination but not development of seedlings of all four species. Low light levels near the forest floor were the major constraint on seedling development of H. odorata. There was no regeneration when the mean per cent transmitted incident daily photosynthetic active radiation (PAR) was 2.2; seedling germination but not development was supported when PAR was 6.6; regeneration and development occurred when PAR was 11.4. The soils were slightly acidic with low clay and high sand contents and low nutrient concentration but this was apparently not a constraint on growth given adequate light conditions. The results suggest that the re-establishment of H. odorata on degraded sites using nurse crops should be possible provided that high levels of shading are avoided.

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Item Type:	Article
AGROVOC Term:	Regeneration
AGROVOC Term:	Hopea
AGROVOC Term:	Site preparation
AGROVOC Term:	Reforestation
AGROVOC Term:	Timber
AGROVOC Term:	Secondary forests
AGROVOC Term:	Stand structure
AGROVOC Term:	Light requirements
AGROVOC Term:	Seedlings
AGROVOC Term:	Soil requirements
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/21388

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