撑绿竹3号无性系幼竹高生长规律初步研究

Preliminary study on rule of height growth of Chengluzhu No.3 young bamboo

在贵州省赤水市撑绿竹引种地,于7-10月进行了撑绿竹幼竹高生长过程的观测,结果通过最优分割法进行聚类分析,将撑绿竹高生长的过程分为初期、盛期和末期。其中盛期历时75d,日平均生长量11.6 cm,生长量占高生长的92.04%;撑绿竹高生长数学模型为三次函数模型;撑绿竹的高生长存在昼夜差异,总的趋势是夜生长量大于昼生长量,占全天生长量的67.2%,昼生长量仅为全天生长量的32.8%。高生长最慢在14时左右,最快在2时及6时左右;气象因子中相对湿度对高生长的影响达极显著水平,最高气温和日照时间的影响达显著水平;同时这3个气象因子与高生长均呈负相关关系,而降雨量、日均温和最低气温的影响则不显著。

Chengluzhu is a hybrid of Bambusa peroariabilis McClure as female with Dendrocalamopsis daii Keng as male parent. The clone Chengluzhu No. 3 was introduced to plant in north Guizhou for pulp. The height growth process of Chengluzhu No. 3 was observed in Chishui city of Guizhou province from July to October in 2006, and the observed results were clustered by the Fisher method. The height growth process of the Chengluzhu No. 3 was divided into the initial period, peak period and end period. The peak period lasted 75 days with a mean growth of 11.6 cm, and this period accounted for 92. 04% of the total height growth. The height growth of the Chengluzhu No. 3 existed a difference between the daytime and the nighttime, the total trend was that the growth at nighttime was greater than that at daytime,the height growth at nighttime could account for 67. 2% of the total growth of the day,but the growth at daytime was only 32.8%. The low point of the height growth was at 14：00 and the fast points were at 2：00 and 6：00. The relative humidity in climate factors had the more significant negative effect on the height growth, and maximum temperature and sunny hours had the significant negative effects on the height growth,but the rainfall,mean daily temperature and minimum temperature had no significant effect on the height growth.