中文摘要：

为研究河南省银杏雄株的开花生物学特性,对14株百年以上的银杏古树的开花时间、花穗长、花穗宽、单穗花药数、花粉长、花粉宽等指标进行了调查分析。结果表明：银杏古树雄株开花时间一般从3月底到4月中旬,花期3～7d不等;14个银杏古树雄株花穗长在21.33～31.36mm,平均为27.74mm;花穗宽5.81～7.90mm,平均为6.94mm;单穗花药数在39.80～56.17,平均为50.15个;花粉长在30.05～34.66μm,平均为33.47μm;花粉宽在13.93～17.73μm,平均为15.32μm。方差分析结果表明,不同雄株间在花穗长、花穗宽、单穗花药数、花粉长、花粉宽均存在极显著差异。

英文摘要：

The flowering biological character of male ginkgo trees was studied in Henan Province,the flowering period,the length of spica,the width of spica,the anther number of spica of 14 ancient male ginkgo trees was investigated and analyzed.The results showed that the flowering period of male ginkgo trees ranged from late March to middle April and flowering lasted for 3-7days;the length of spica ranged from 21.33 mm to 31.36 mm and the average number was27.74mm;the width of spica ranged from 5.81 mm to 7.90 mm and the average number was 6.94mm;the anther number of spica ranged from 39.80 to 56.17 and the average number was 50.15;the length of pollen ranged from30.05μm to 34.66μm and the average number was 33.47μm;the width of pollen ranged from 13.93μm to 17.73μm and the average number was 15.32μm.The results indicated that the flowering period,the number of flower spikes on short shoot,the length of spica,the width of spica and the anther number of spica of ancient male ginkgo trees were all significant differences.