不同种源西南桦在云南景东的生长差异

从西南桦分布区内选择的13个种源在南亚热带山地进行筛选试验的结果表明:不同种源在生长、产量、形态 特征上都有很大差异。以胸径、树高、材积和干形等为指标,用坐标综合评定方法对13个不同种源进行综合评定, 结果表明:潞西、屏边和镇源3个种源生长和形态等各种特征都比其它种源好,位列前3名,是当地适生的好种源; 西马、龙陵和百色种源表现较好,属可利用种源;腾冲和西莲种源表现差,不好利用;平果、凭祥、靖西、景洪和田林5 种源表现一般,最好不发展。

The Growth Difference of Different Betula alnoides Provenances in South Subtropical Mountainous Areas

The results of filter test including 13 provenances collected from the distribution areas of Betula alnoides processed in south subtropical mountainous areas showed: trees from different provenances were different quite in growth, morph -character and yield, which was integrately evaluated by the indexes of diameter,height, volume,stem form,crown width, crown volume, and pruning power. The results indicated that the provenance from Luxi, Pingbian, and Zhenyuan were better than the others in all characters, suitable for local conditions; the provenances from Xima,Longling and Baise could been selected for utilization; trees from Tengchong and Xilian provenance grew worse, and could not be utilized well. The provenances grew the worst from Pingguo, Pingxiang, Jingxi, Jinghong and Tianlin can not be developed in the areas.