Responses to Nutrient Addition among Shade-Tolerant Tree Seedlings of Lowland Tropical Rain-Forest in Singapore

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Abstract

1 Two bioassays of growth limitation were carried out for seedlings of four shade-tolerant tree species (Antidesma cuspidatum, Calophyllum tetrapterum, Dipterocarpus kunstleri and Garcinia scortechinii) growing in P-deficient soil taken from lowland dipterocarp forest in Singapore, as a test of the hypothesis that growth would be limited by the availability of phosphorus.

2 Seedlings of only one species, Antidesma cuspidatum, showed increased growth in response to increased nutrient supply and in that case the limiting nutrient was not P. A majority of seedlings of Antidesma, Calophyllum and Garcinia in this experiment possessed VA mycorrhizas.

3 For seedlings of Antidesma, addition of magnesium led to an increase in the concentration of Mg in all fractions and a positive relation between Mg concentrations and dry mass yield. Addition of potassium and calcium resulted in reductions in concentrations of these elements in the leaves of Antidesma.

4 Seedlings of Antidesma, Calophyllum and Dipterocarpus responded to P by altering distribution of dry mass between different plant parts; the pattern of response varied between species. Phosphorus taken up in excess of requirements for vegetative growth was transferred to plant stems rather than leaves.

5 The outcome of pot bioassays may be dependent on factors such as pot size, irradiance and soil moisture conditions; therefore conclusions drawn here need to be tested by field fertilization experiments.

Original languageEnglish
Pages (from-to)113-122
Number of pages10
JournalJournal of Ecology
Volume83
Issue number1
Publication statusPublished - Feb 1995

Keywords

  • antisdesma-cuspidatum
  • calophyllum-tetrapterum
  • dipterocarpus-kunstleri
  • garcinia-scortechinii
  • phosphorus
  • seminal root system
  • nitrogen mineralization
  • bukit-timah
  • growth
  • soil
  • nitrification
  • microclimate
  • availability
  • limitation

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