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- Publisher
- Oxford University Press
- Copyright
- © Oxford University Press
- ISSN
- 0305-7364
- eISSN
- 1095-8290
- DOI
- 10.1093/oxfordjournals.aob.a088138
- Publisher site
- See Article on Publisher Site
Abstract
Abstract Biomass, net primary production and energy fixation in an age sequence of Himalayan alder (Alnus nepalensis D. Don) plantations were estimated in the Kalimpong forest division of the eastern Himalayas. Biomass in the plantations ranged from 106 t ha−1 (7-year stand) to 606 t ha−1 (56-year stand) demonstrating the potential of the alder for accumulating large biomass. Net primary production and net energy fixation rates of the plantations were reduced by nearly half in the 7-year stand (25 t ha−1 year−1; 421 × 106 kJ ha−1 year−1) compared with the 56-year stand (13 t ha−1 year−1; 215 × 106 kJ ha−1 year−1). Compartmental models of energy storage and flow rates were developed for the 7-year and 56-year stands. The production efficiency, energy conversion efficiency and energy efficiency in N2 fixation have inverse relationships with plantation age. These efficiencies, when treated with each other, showed significant exponential functions. Alnus nepalensis D. Don, Himalayan alder, plantation age, biomass, net primary production, energy flow, efficiencies This content is only available as a PDF. © Oxford University Press
Journal
Annals of Botany – Oxford University Press
Published: Apr 1, 1991