日本垂枝、叶籽、喇叭、斑叶及雌雄同株银杏资源调查

简述日本垂枝银杏、叶籽银杏、喇叭银杏（我国文献称“筒叶银杏”）、斑叶银杏及雌雄同株银杏实生大树、古树资源概况。查有可靠依据者共有1 1 7株，其中垂枝银杏1 4株、叶籽银杏78株（包括5株雄株）、喇叭银杏1 9株、斑叶银杏4株、雌雄同株银杏2株。部分单株兼具垂枝、叶籽、喇叭、斑叶性状中的2个或5个性状，因此共有1 07株。实际上，该类资源的数量要远多于此。多数单株为各级政府指定的“天然纪念物”，其中国家级指定“天然纪念物”叶籽银杏8株，雌雄同株银杏1株。

Ginkgo resources of different types in Japan

Japanese ginkgo resources of different types including Ginkgo biloba var. pendula Hort., Ginkgo biloba var. epiphyllaMakino, Ginkgo bilobab ＇Tubifolia＇, Ginkgo biloba var. variegata Cari., monoecious tree and ancient tree were summarized. Thereliable recorded 117 trees were investigated, among which 14 trees were Ginkgo biloba var. pendula Hort., 78 trees were Ginkgobiloba var. epiphylla Makino （including 3 staminiferous plants）, 19 trees were Ginkgo bilobab ＇Tubifolia＇, 4 trees were Ginkgo bilobavar. variegata Cari., 2 trees were monoecious plants. Some plants have combining 2 or 3 traits, so the actual number is 107 trees. In fact,plant resources are more than 107. Most of single plant is natural monument designated by government at all levels. Eight Ginkgo bilobavat. epiphylla and 1 monoecious plant are designated as natural monument by national government.