林芝地区光核桃种群的年龄结构

根据西藏林芝地区光核桃种群分布区内所选的几个代表性地点定位观测资料,通过DPS统计软件,统计出光核桃年龄与基径的回归方程,结果表明:村庄光核桃种群年龄与基径的回归方程为y=3.153 8e0.1673x,平均年龄为72.14 a;农田光核桃种群年龄与基径的回归方程为y=1.460 9x 2.750 6,平均年龄为59.15 a;村庄光核桃种群年龄与基径的回归方程为y=28.89e0.020 5x,平均年龄为68.21 a.村庄和农田型光核桃种群都处于衰退阶段,荒地光核桃种群处于从稳定型向衰退型过渡的阶段.整个林芝地区光核桃种群处于衰退状态,在所有样地调查中没有发现树龄小于10 a的植株,主要原因是人为干扰.针对这种状况,提出了3项资源保护措施:人工育种、合理开发光核桃果实资源、对光核桃的生理学和嫁接技术进行研究.

The Age Structure of Tibetan Prunus mira Koehne Kov et. Kpsl Population in Tibet Linzhi Region

In this paper,the regression equations between the ages and the base diameters of Prunus mira Koehne Kov et.Kpsl were analyzed by DPS based on the data from the three typical sites of Prunus mira Koehne Kov et.Kpsl population in Linzhi region of Tibet.The results showed that the regression equation of the populations was y=3.153 8 e0.167 3x in the village site,and the average age was 72.14 a.While in the farmland site,the equation was y=1.460 9x 2.750 6,and the average age was 59.15 a.In the wasteland site,the equation was y=28.89e0.020 5x,and the average age was 68.21 a.The populations of Prunus mira Koehne Kov et.Kpsl in the village site and the farmland site were in a decline stage,but the population in the wasteland site was from stable to decline.The populations in the whole Linzhi was in senescent,and the trees younger than 10 a were not found in all sites.The main reason for this was due to disturbance.Therefore,cultivars breeding,reasonable exploiting,graft-technique and physiology researching were measures to protect Tibetan Prunus mira Koehne Kov et.Kpsl population.