白皮松种子及球果形态特征的地理变异

对白皮松种子及球果１６项形态特征指标的研究发现，各指标在同一种源不同单株间差异不大，而不同种源之间除种子长度外差异均达显著或极显著水平．球果高和单个球果重量表现出同经度下的南北变异；种子厚度、球果高径比和每球果种子数则表现为同纬度下的东西变异；球果宽度和种皮所占比例则又表现为西南东北向变异；种子及球果的颜色、每球果种鳞数、千粒重等则无明显的地理变异趋势．它们似与太阳辐射量、生长期的长短、１月平均温度及海拔高度等多因子有关．

Geographical Variation of Morphologic Characteristics of Pinus bungeana Seeds and Cones

morphologic characteristics of seed and cone of P.bungeana have been studied intensively. The results show:there are no significant difference among morphologic characteristics of individual tree from same provenance.Those from different provenances appear a obvious difference except the length of seed. The height and the weight of cone prove a south north variation at same longitude, the thickness of seed, height and diameter ratio of cone, the number of seeds in individual cone show a west east variation at the same latitude.Southwest northeast variation is existed at the width of cone and proportion of seed coat.There are no significant trend on geographic variation on color of seed and cone, the number of scales of individual cone and 1 000 seeds' weight. They are controlled by amount of solar radiation, the length of frost free period, the temperature in the coldest month and the altitude.