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产生复干是银杏个体发育过程中一个普遍现象。本研究以临沂生生园全国最大复干银杏群落为研究对象,采用每木检尺的方式对园内复干银杏进行调查。结果显示,生生园内银杏共385株,雌株379株,占98.44%。平均树高20.9 m,平均总胸径0.93 m,平均母干胸径0.33 m,冠径在5.0～15.0 m范围内,枝下高平均6.3 m。368株有复干,复干率为98.58%,每株复干数平均为4.6个,最大复干高平均为12.5 m,胸径平均0.18 m,复干与母干距离平均为0.61 m,复干与母干夹角平均为10.5°。34株无萌蘖,萌蘖平均株数为38株,萌蘖高平均1.11 m,萌蘖与母干最大距离平均0.73 m。该片银杏林原桩有240年历史,现存复干银杏系从原桩萌发形成,树龄53年。本研究对生生园复干银杏的起源、性别比例、复干与银杏适应性的关系、复干的利用等进行了探讨。
The production of Fugan is a common phenomenon in the development of Ginkgo biloba. In this study, the largest rehabilitation of Ginkgo biloba community in Linyi Shengshengyuan as the research object. The results showed that there were 385 ginkgo and 379 female, accounting for 98.44%. The average tree height was 20.9 m, the average total diameter at breast height was 0.93 m, the average breastfed diameter at breast height was 0.33 m, the crown diameter was in the range of 5.0-15.0 m, and the branch height was 6.3 m. 368 plants were dry and the dry recovery rate was 98.58%. The average number of dry plants per plant was 4.6, the maximum dry and dry plantations were 12.5 m and the average diameter was 0.18 m, respectively. The average distance between dry and dry trunk was 0.61 m, Angle with the average angle of 10.5 °. 34 plants had no sprout, the average number of sprout plants was 38, the average height of sprout was 1.11 m, and the maximum distance between sprout and stem was 0.73 m. The piece of Ginkgo biloba original pile 240 years of history, the existing complex stem Ginkgo biloba germination from the original formation, age 53 years. In this study, the origin, the sex ratio, the relationship between the complex stem and the adaptability of Ginkgo biloba and the utilization of the complex stem were studied.