激光回波强度为点云数据的一种属性信息, 是目标对发射激光光束后向散射回波的光功率, 可以反映目标物体的表面特性。毛竹表面特征由其生理生长特性决定, 通过分析激光回波强度信息, 构建不同年龄竹秆的节间与激光回波强度的关系模型, 比较不同年龄毛竹拟合激光回波强度与实测激光回波强度的均方根误差, 以此判别毛竹的年龄, 并验证分析模型精度。结果表明：不同年龄和不同节间毛竹竹秆激光回波强度差异性显著, 节间内激光回波强度的差异性不明显; 该方法判别年龄的准确率达到92.5%, 地面三维激光扫描技术可为快速测算毛竹生物量提供竹龄参数。

The laser scanning intensity is an attribute of point cloud. It is the optical power of echo from laser to target and can reflect the surface properties of the target. The surface properties of Phyllostachys edulis depend on its physiological growth characteristics. We analyze the information of laser scanning intensity of Phyllostachys edulis, model the relationship between trunk No. and laser scanning intensity for Phyllostachys edulis with different ages, compare the root mean square error between the fitting and measured laser scanning intensity so as to distinguish the bamboo age and verify accuracy of the constructed model. The results show that there is significant difference in laser intensity of bamboos with different ages and in different trunks, while the difference is not significant in laser intensity of bamboos in the same trunk. The distinguishing accuracy over 92.5% is realized. The polynomial model can efficiently distinguish Phyllostachys edulis age, which is helpful for estimating its biomass by three-dimensional terrestrial laser scanning.