森林在维系生态系统及保护生态环境中日益被人们认识和重视。大风作用造成林木破坏，给林场造成了巨额的经济损失，并极大提高了森林管理和经营的成本。随着气候的不断变化，强风造成的损失还在逐年增加。应对风害，需要了解大风破坏森林、毁坏林木的机理。本项目以北方沿海防护林主要树种黑松（Pinus thunbergii）、刺槐（Robinia pseudoacacia）和毛白杨（Populus tomentosa）为对象，进行实际风荷载和模拟风荷载作用下林木的力学响应特性试验：沿林木高度方向多点布置测定应力、变形等的传感器和加载装置，并与风荷载同步采集，实时反映林木的力学响应特性。在试验研究的基础上，结合结构振动分析理论，建立风荷载作用下林木力学响应模型。进行基于3D建模的有限元数值计算，预测大风作用下防护林林木发生破坏的风险，为防护林管理者采取措施保护林木、减少损失提供依据。

Functions of forest in maintaining a stable eco-system and environment protection have been incrementally paid attention. And due to the wind disasters, a large number of financial lost had happened in forest annually, which follows the enhancement of the cost of forest management. Strong wind nurtured by the gradually changing climate leads to more timber lost by years. So, knowing the mechanism of how the tree is damaged by strong wind well is the key to handle this problem. Our project aims to study the tree’s mechanical characteristics (which basically are shelter forest species such as Pinus thunbergii, Robinia pseudoacacia and Populus tomentosa) by the experiments of applying simulated and real wind loads on a given tree and analyzing the digital recorded data from the sensors placed on varied height of the tree, which monitoring the stress, strain, displacement and torsion separately and simultaneously. The experiment of simulated wind loads was to study the simulative wind’s temporal and spatial distribution by applying the average and fluctuant load on several positions of a tree. Basing the real and simulated wind load experimental study, then combining the theoretical analyze of structure vibration under dynamic load, we can reach a model which shows the reaction of a tree to the wind loads. A 3-D model will be made to fit for the finite element method study then to value the probability of wind damage happens in a forest. With the help of this model, more reasonable forest management methods will be taken and the financial lost of shelter forests could be cut down.