Measurement of gap size and understorey light intensities after logging in Central Kalimantan
1999
Nifinluri, T. | Clearwater, M.J. | Gardingen, P. van
The aim of the study was to provide a simple measure of the size of artificial gaps in dipterocarp forest that could be related to the availability of light and hence seedling growth near the gap centre. The size of canopy openings in secondary forest can then be controlled to achieve the optimum light levels for regeneration of timber seedlings. Hemispherical photography was used to estimate light availability in logging gaps of a range of different sizes in Central Kalimantan. Predictions from photographs were calibrated against direct measurements of light availability using light sensors. Simple physical measurement of gap size and orientation were taken at the same time and compared to the estimates of light availability. The best index of gap size was found to be the multiple of gap area and the ratio of gap length in two cardinal directions (East-West/North-South). When the results of this study are combined with the results of a study of seedling growth rates, it can be concluded that light intensities near the centre of relatively small gaps will be sufficient for the maximum growth of wild Shorea seedlings.
显示更多 [+] 显示较少 [-]