摘要
以1年生和4年生银杏苗为对象,观察其基生垂乳生长状况。共调查1年生银杏苗211株,4株有基生垂乳着生,基生垂乳发生率为1.90%;4年生银杏苗478株,302株有基生垂乳着生,基生垂乳发生率为63.18%。4年生银杏苗中,单垂乳单株有221株,占73.18%;双垂乳单株有60株,占19.87%;3个垂乳单株18株,占5.96%;4个垂乳单株3株,占0.99%。1年生银杏苗垂乳长度最大为0.7 cm,最小为0.5 cm,平均为0.6 cm;基径最大为0.50 cm,最小为0.30 cm,平均为0.38 cm。4年生银杏苗垂乳长度最大为6.0 cm,最小为0.2 cm,在0～1.5 cm范围内个数最多;基径最大为4.0 cm,最小为0.2 cm,在1.0～2.0 cm范围内垂乳个数最多。单株垂乳个数和萌蘖对垂乳长度、基径影响明显。4年生银杏苗的基生垂乳均着生不定根,15株有新产生的不定根。
The incidence rate of basal lings. Out of 211 one year old seedlings, 4 chichi of seedlings Ginkgo biloba plants was studied with l a were found to be with basal chichi, the and 4 a old seed- incidence rate was 1.90%. Whereas 302 four years old seedlings out of 478 were found to have chichi whose incidence rate was 63.18%. Among the 302 four years old seedlings with chichi, 211 seedlings were with single chichi, which ac- counted for 73.18% ; 60 seedlings were with 2 chichi that accounted for 19.87% ; 18 seedlings were with 3 chichi, accounting for 5.96% ; and 3 seedlings with 4 chichi that accounted for 0.99%. The maximum length of basal chi- chi of 1 year old seedlings was 0.7 cm, while the minimum length was 0.5 cm, and the average basal chichi length from one year old seedlings was 0. 6 cm. The maximum diameter of the basal chichi of 1 year old seedlings was 0. 5 cm, the minimum was 0. 3 cm and the average diameter was 0. 38 cm. Whereas the maximum length of basal chichi of 4 years old seedlings was 6.0 cm, the minimum chichi length was 0. 2 cm and the majority chichi were 0 - 1.5 cm long. The maximum diameter of the basal chichi of 4 years old seedlings was 4. 0 cm, the minimum was 0.2 cm and the diameter of the most chichi from 4 years old seedlings was 1.0 -2. 0 cm in diameter. The length and base diameter of the chichi were significantly influenced by the basal chichi number and sprouting quantity. It was ob- served that 15 four years old seedlings developed adventitious roots from the basal chichi.
出处
《西南林业大学学报（自然科学）》
CAS
2013年第1期34-38,44,共6页
Journal of Southwest Forestry University：Natural Sciences
基金
国家自然科学基金项目(30671707
30872040)资助
关键词
银杏苗
基生垂乳
生长特性
seedlings of Ginkgo biloba
basal chichi
growth characteristics
