都匀市南方红豆杉资源调查

Resources Investigation on Taxus chinensis var. mairei in Duyun City

[目的]了解都匀市南方红豆杉资源。[方法]调查都匀市南方红豆杉资源的数量、分布特征、生长状况及生境因子。[结果]都匀市南方红豆杉古树共有56株，平均树高16．60 m，其中树高10．50～19．70 m的有40株，占71．4％；东西平均冠幅9．76 m，南北平均冠幅9．80 m；平均枝下高3．30 m。胸径在50 cm以内的最多，有29株，占51．8％；南方红豆杉的东西冠幅和南北冠幅的均值相近，29株在5．00～10．00 m，占51．8％，大于20．00 m的极少；海拔分布在725．00～1232．00 m。[结论]调查结果为南方红豆杉资源的保护提供了理论依据。

Objective] To grasp the Taxus chinensis var.mairei resources in Duyun City.[Method] The quantity, distribution characteris-tics, growth status and habitat factor of T.chinensis were investigated in Duyun City.[Result] There were in all 56 plants of T.chinensis in Duyun City.The average plant height was 16.60 m.Among them, 40 plants were between 10.50 and 19.70 m, accounting for 71.4%.The average crown diameters from east to west and from south to north were 9.76 and 9.80 m, respectively.The average clear bole height was 3.30 m.A total of 29 plants had the diameter at breast height within 50 cm, accounting for 51.8%.The mean value of east to west crown di-ameter was close to that of south to north crown diameter.29 plants were between 5.00-10.00 m in height, accounting for 51.8%.Plants higher than 20.00 m were extremely few.The altitude was distributed between 725.00 and 1 232.00 m.[Conclusion] The investigation re-sults provided theoretical foundation for the protection of T.chinensis resources.