粉单竹的地理变异研究

对8个产地粉单竹在广东茂名试验点所造试验林的主要生长性状进行调查研究,结果表明:粉单竹表型性状变异丰富,13个生长性状在产地间差异显著或极显著,其中单丛发笋量在产地间及产地内均存在显著差异;地理变异模式呈现纬度渐变趋势但未达到显著水平,多数性状与热量因子相关紧密,相关系数达到极显著、显著或0.1显著水平,仅叶厚、枝下高与湿度因子呈现显著或0.1水平相关;所调查的生长性状均受中等以上的遗传控制;聚类分析在距离阈值1.8附近可将所有产地分为3个类群;采用综合评定法,对所涉及的8个产地进行初步选择,认为广东增城、怀集为粤西南地区粉单竹造林的最佳产地来源.

Geographic Variation of Bambusa chungii

In this study, according to the growth trait data of 8 provenances of Bambusa chungii, the geographic variation of the species was analyzed. The analysis showed that there were abundant variances of 13 growth traits among the different provenances and all the variances reach significant or extremely significant level. Variance of shoot number of single clump among and within provenances was both significant. The rules of geographic variation presented some trends of latitude change pattern. Most of these traits had a close correlation with thermal factors, and the correlation indices reached extremely significant, significant and 0.1 level respectively. The correlation among leaf thickness, clear height and humidity reached 0.1 level significance. Heritabilities of all the traits investigated in this research were bigger. By cluster analysis on main growth characters, all the provenances can be classified into three groups. Selection for all the provenances was given on the basis of synthetic evaluation. The provenances Zengcheng, Huaiji were considered the optimal provenances for region around southwest of Guangdong Province.