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                                                                                                                                                                                                                      銀杏

                                                                                                                                                                                                                      文章來源:管理員           添加時間:2012-09-14 14:00:36

                                                                                                                                                                                                                      銀杏
                                                                                                                                                                                                                      別名:白果樹、公孫樹
                                                                                                                                                                                                                      科屬:銀杏科銀杏屬
                                                                                                                                                                                                                      變種品種:黃葉銀杏、塔狀銀杏、裂葉銀杏、垂枝銀杏、斑葉銀杏
                                                                                                                                                                                                                      習性:銀杏壽命長。適于生長在水熱條件比較優越的亞熱帶季風區。初期生長較慢,蒙蘗性強。喜光,耐寒,深根性,喜溫暖、濕潤及肥沃平地,忌水澇。適應性強,銀杏對氣候土壤要求都很寬范。雌株一般20年左右開始結實,500年生的大樹仍能正常結實。一般3月下旬至4月上旬萌動展葉,4月上旬至中旬開花,9月下旬至10月上旬種子成熟,10月下旬至11月落葉。銀杏是雌雄異株植物,在實際中要加以區別應用。
                                                                                                                                                                                                                      形態特征:落葉大喬木,高達40米,胸徑可達4米,幼樹樹皮近平滑,淺灰色,大樹之皮灰褐色,不規則縱裂,有長枝與生長緩慢的距狀短枝。葉互生,在長枝上輻射狀散生,在短枝上3一5枚成簇生狀,有細長的葉柄,扇形,兩面淡綠色,在寬闊的頂緣多少具缺刻或2裂,寬5-8(一15)厘米,具多數叉狀并歹帕細脈。雌雄異株,稀同株。種子核果狀,具長梗,下垂,橢圓形、長圓狀倒卵形、卵圓形或近球形,假種皮肉質,被白粉,成熟時淡黃色或橙黃色;種皮骨質,白色,常具2(稀3)縱棱;內種皮膜質,淡紅褐色。
                                                                                                                                                                                                                      園林用途:銀杏樹為高大落葉喬木,軀干挺拔,姿態優美,葉形古雅,玲瓏似扇形,春夏翠綠,深秋金黃,抗病害力強、耐污染力高,壽命綿長,是理想的園林綠化、行道樹種。它以其蒼勁的體魄,獨特的性格,清奇的風骨,較高的觀賞價值和經濟價值而受到世人的鐘愛和青睞??捎糜趫@林綠化、行道、公路、田間林網、防風林帶的理想栽培樹種。


                                                                                                                                                                                                                       

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