桉树抗风特性及其主要影响因子研究

Eucalyptus is one of the most important plantation tree species in Southern China. It and its plantation provide timber and carbon sequestration，and improve the ecological environment.However,the coastal area of South China is subjected to typhoons to hit, which bring strong winds threaten to trees growth and development，and wind damage has seriously affected the development of eucalyptus plantations and its industry. So there is an urgent need for wind-resist tree species selected for the construction of commercial forest or coastal protection forest. An individual tree-based mechanics model is well suited to identify and explore physical processes contributing to wind damage,and useful for predicting the risk of wind damage to individual trees , but generally base on the tree within homogeneous structures.In view of these, the measurements of tree structure characteristics, wind-resist traits will be made on trees from three eucalyptus species ,and analysis of their variance will be performed. Based on the above-mentioned studies,the mechanics models and numerical models of wind damage and will be established to get the wind-loading features and the main influence factors/traits on the tree pulling test and numerical simulation to provide insights into the physical mechanisms of wind damage. Four standing trees from E.camaldulensis family will be selected and tested to verify the model，Lastly，the genetic variation of the main influence factors/traits and wind-resist characteristics evaluation of the eucalyptus species tested will be performed.The project would be completed as scheduled and its desired results will be helpful to the development of eucalyptus plantation.

桉树是我国华南地区重要的人工林树种之一，在木材供应、碳汇供给和生态环境改善等方面发挥着重要的作用，但沿海地区台风频发，已严重影响桉树及其产业的发展，亟需选择抗风树种（品系）用于商品林/沿海防护林的建设。林木单株风害模型能准确预测林木风害变化过程，因而是解决这一问题的有效途径。而树木特性又是构建单株风害模型的核心。鉴于此，本研究以桉树单株为非均质树木结构，在分析不同树种林木结构特征、抗风相关性状变异的基础上，采用模拟风害，建立单株风载力学模型，并基于风载力学模型建立数字化植株，分析风与重载荷下的变形以及抗风主要影响因子，进一步以赤桉家系进行验证，并对主要影响因子/性状进行遗传变异分析，对测试桉树树种抗风特性进行评估。项目从多学科对桉树抗风特性深入研究，研究结果为我国桉树人工林培育提供理论、技术支持和实践指导。

本研究以桉树单株为非均质树木结构为前提，在分析不同树种林木结构特征、抗风相关性状变异的基础上，采用模拟风害，建立单株风载力学模型，并基于风载力学模型建立数字化植株，分析风与重载荷下的变形以及抗风主要影响因子，进一步以赤桉家系进行验证，并对主要影响因子/性状进行遗传变异分析，对测试桉树树种抗风特性进行评估。筛选获得一批生长优良、抗风种源家系。项目从多学科对桉树抗风特性深入研究，研究结果为我国桉树人工林培育提供理论、技术支持和实践指导。