Tran, DL and Beadle, C and Eyles, A and Forrester, DI and Doyle, R and Worledge, D and Churchill, K and Dao, CK, Growth and physiology of Hopea odorata planted within gaps in an acacia plantation acting as a nurse crop, Plant Ecology & Diversity, 9, (5-6) pp. 549-562. ISSN 1755-0874 (2016) [Refereed Article]
Copyright 2017 Botanical Society of Scotland and Taylor & Francis
Background: Mixtures of tropical acacia nurse crops and understorey native species have been established to aid forest restoration in Vietnam, but with partial success. Knowledge of physiological mechanisms underlying competitive interactions remains limited.
Aims: To examine growth and physiological responses of Hopea odorata, a shade-tolerant dipterocarp, established within an Acacia hybrid (Acacia mangium × Acacia auriculiformis) nurse-crop plantation.
Methods: H. odorata seedlings were planted within three 22-m diameter gaps in a 3-year-old Acacia hybrid plantation in Central Vietnam. Growth and physiology responses to an environmental gradient in gaps were examined over 2 years.
Results: Growth rate and maximum rates of photosynthesis and stomatal conductance of H. odorata saplings increased significantly with increases in relative daily incident photosynthetically active radiation from 24% at the gap perimeter (GP) to 61% at the gap centre. Leaf N, P, and chlorophyll concentration were unaffected by position in the gap. At the end of dry season, there were significant reductions in leaf water potential for saplings close to the GP suggesting interspecific competition for water.
Conclusions: Despite naturally regenerating in shade, the strong ability of H. odorata to acclimate to high light environments suggests that its re-establishment on degraded sites, using Acacia hybrid as a nurse crop should be possible, provided that competition for light and water are managed.
|Item Type:||Refereed Article|
|Keywords:||dipterocarp, light response, native species planting, shade tolerant, water competition|
|Research Division:||Agricultural, Veterinary and Food Sciences|
|Research Group:||Forestry sciences|
|Research Field:||Tree nutrition and physiology|
|Objective Division:||Plant Production and Plant Primary Products|
|Objective Field:||Hardwood plantations|
|UTAS Author:||Tran, DL (Mr Dong Tran)|
|UTAS Author:||Beadle, C (Dr Chris Beadle)|
|UTAS Author:||Eyles, A (Dr Alieta Eyles)|
|UTAS Author:||Doyle, R (Associate Professor Richard Doyle)|
|Web of Science® Times Cited:||2|
|Deposited By:||Tasmanian Institute of Agriculture|
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