银杏叶片形态研究

通过对银杏不同枝类、不同叶序的叶片形态进行调查,结果表明:银杏不同枝类的叶片形态差异较大,叶宽、叶柄长、叶基角:多年生鳞枝＞一年生鳞枝＞一年生长枝;叶长、叶形指数:一年生长枝＞一年生鳞枝＞多年生鳞枝;叶面积:一年生和多年生鳞枝＞一年生长枝;有缺刻叶比例:一年生长枝＞多年生鳞枝＞一年生鳞枝.一年生长枝叶片的叶宽、叶长、叶面积、叶柄长、叶基角均随叶序的增加逐渐减小,叶形指数和有缺刻叶的比例则增加.一年生和多年生鳞枝1～5叶的叶长、叶宽和叶面积随叶序增加而逐渐增加,第5～6叶达最大,以后随叶序增加而逐渐减小,叶形指数和叶柄长度随叶序增加而增加,叶基角随叶序增加而减小.一年生长枝的第2叶、一年和多年生鳞枝的第4叶可作为品种描述的标准叶.

Leaf Characteristics of Ginkgo biloba L.

In this paper, the ginkgo leaves in different shoots were investigated. The leaf width, petiole length and basal angle were spur>short shoot>long shoot; the leaf length, leaf index were long shoot>short shoot>spur; the leaf area was spur=short shoot>long shoot; the ratio of lobation was long shoot>spur>short shoot. In long shoot, the leaf width, leaf length, leaf area, petiole length and basal angle decreased, but the leaf index and the ratio of lobation increased as its arrangement increased. In short shoot and spur, the leaves got longer, wider and bigger as leaf arrangement increased, the fifth or sixth leaf was the longest and widest, and its area was biggest, after the fifth or sixth arrangement the leaves got shorter, narrower and smaller as arrangement increased, the leaf index and the petiole length increased, but the basal angle decreased as arrangement increased. The second leaf in long shoot, the fourth leaf in spur and short shoot had the smallest coefficient of variation (c.v) in the investigated leaves, indicated these leaves may be used as standard leaves.