Physiological characteristics of acacia auriculiformis A. Cunn. ex Benth., acacia mangium willd. and pterocarpus indicus willd. In the la mesa watershed and Mt. Makiling, Philippines

Abstract

The physiological responses of nitrogen-fixing species (Acacia auriculiformis A.Cunn. ex Benth., Acacia mangium Willd. and Pterocarpus indicus Willd.) were determined using 2-year-old, 10-year-old and 20-year-old age classes. Parameters obtained were stomata size and number, leaf anatomical characteristics, total leaf nitrogen and carbon concentrations, net photosynthesis rate (PN), photosynthetic nitrogen utilization efficiency (PNUE), transpiration rate (E), stomatal conductance (gs), water use efficiency (WUE), net CO2 assimilation rate vs calculated internal CO2 concentrations (A/Ci curve), rate of maximum Rubisco carboxylation (Vcmax) and photosynthetic photon flux density saturated rate of maximum electron transport (Jmax). In all the studied species and age classes, significant differences in PN were observed (p<0.001) and was higher in 20-yr-old A. mangium (12.4 μmol CO2 m-2 s-1) and A. auriculiformis (11.5 μmol CO2 m-2 s-1). Also, PNUE, gs, and WUE were significantly higher (p<0.050) in 20-yr-old A. auriculiformis (4.57 μmol g-1 s-1, 0.71 mol H2O m-2 s-1, and 7.71 CO2 m-2 s-1/mmol H2O m-2 s-1, respectively) and A. mangium (5.93 μmol g-1 s-1, 0.86 mol H2O m-2 s-1, and 7.94 μmol CO2 m-2 s-1/mmol H2O m-2 s-1, respectively). A. auriculiformis and A. mangium showed better physiological attributes, which could be important features for species to be used for rehabilitating degraded areas of the country.

Source or Periodical Title

Journal of Environmental Science and Management

ISSN

1191144

Page

14-28

Document Type

Article

Subject

Acacia auriculiformis, Acacia mangium, Exotic species, Fast growing, Nitrogen-fixing trees, Physiological characteristics, Pterocarpus indicus, Rehabilitation

This document is currently not available here.

Share

COinS