Towards the Prediction and Management of Windthrow in Eucalyptus Plantations Across Tasmania, Australia
Tasmania, Australia, lies between latitudes 40° and 44° where strong winds and heavy rainfall are common. Much of the plantation estate is located in exposed areas at altitudes of up to 1,000m above sea level, and often surrounded by mountainous terrain. Intensive silvicultural regimes are used to produce high value sawn timber and veneer products, principally of Eucalyptus globulus and E. nitens. Notably, these regimes include a single heavy thinning, an operation known to promote tree instability. As a result, there is concern regarding the risk of windthrow. The factors proven to directly influence the risk of windthrow in other tree species are well known. These include; wind speed, rainfall, elevation, topography, soil properties (physical and hydrological), root development, stand attributes (edge orientation, forest structure), tree characteristics (crown and stem morphology) and silvicultural operations (notably cultivation and. thinning). Howeyer, far less is known of the influence of these factors on windthrow in Eucalyptus plantations. In response, a qualitative windthrow hazard assessment procedure has been developed for Tasmania-WindRISK, based upon a broad review of the literature. In practice, a range of biotic and abiotic variables are assessed and each given a score based on their potential influence on the risk of windthrow (1 = low, 2 = medium and 3 = high). The total score then defines the overall risk of windthrow as low, medium or high. Thinning at a mean dominant height (MDH) > 20m or height : diameter (h : d) ratio > 1.0 is considered over-riding irrespective of the total score, and the risk of windthrow is described as high. This paper offers a summary of WindRISK with examples of recent applications, a program of future research is presented.
Wood MJ Ellis L Volker PW
Research Officer, Division of Forest Research and Development, Plantations Branch, Forestry Tasmania Resource Analyst, Forest Management and Planning, Forestry Tasmania, 79 Melville Street, Hobart 7000 Principal Research Officer, Division of Forest Research and Development, Plantations Branch, Forestr
国际会议
The International Conference on Plantation Eucalyptus(桉树国际会议)
广东湛江
英文
10-19
2005-12-01（万方平台首次上网日期，不代表论文的发表时间）