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千金榆 (Carpinus cordata var. chinensis)和千筋树 (Carpinus fargesiana)是四川省北部山地水青冈林中的两种主要落叶阔叶树。两种植物种子萌发和幼苗生存与生长的实验研究结果显示 :千金榆种子秋季成熟落地后有一年多的休眠期 ,种子主要在落地后的第二和第三个生长季萌发 ;千筋树种子成熟落地后有的可在来年萌发 ,但大部分是在第二个生长季萌发 ;由于每 2～ 3年两种树就有一个较大的结实年 ,每年都会有一些新的幼苗在林中出土 ;尽管两种树是耐荫的 ,但幼苗在较好光照条件下 (如林窗 )生存和生长明显好于在林冠遮荫的地方 ;施肥会加速幼苗的死亡 ,特别是在阴暗的林下 ,但在光照较好的条件下能促进幼苗的生长。结果说明两种鹅耳枥的幼苗可以在林下持续存在 ,但只有在较好的光照条件下 ,如稀疏的林冠下或林窗下才会有明显的净生长。
Carpinus cordata var. Chinensis and Carpinus fargesiana are two major deciduous broad-leaved trees in the Cyclobalanopsis glauca forest in northern Sichuan Province. The experimental study on seed germination and seedling survival and growth of the two plants showed that the seeds of the seedlings germinated in the second and the third growing seasons after they fell to the ground, Some mature ground after germination can occur in the coming year, but most of the germination in the second growing season; since every two to three years have a larger tree year, each year there will be some new seedlings in the forest Although the two trees are shade-tolerant, the seedlings survive and grow better under better light conditions (eg, Ghosn) than in canopy coverings; fertilization can accelerate seedling death, especially in the dark forest , But under light conditions can promote seedling growth. The results showed that two species of hornbeam seedlings could persist under the forest, but only under good light conditions, such as sparse canopy or under the window there will be significant net growth.