不同地理种源的麻竹笋-幼竹生长规律的研究

在漳州与永安开展麻竹地理种源试验,分析地理种源出笋物候期、秆高生长、枝叶生长的变异规律,及高生长与气象因子之间的关系.结果表明,漳州点以中带种源适应能力最强,笋期长,笋量分散,成竹率高.永安点则北带种源笋期长,以飞鸾种源尤为突出.各种源幼竹高生长呈"S"型曲线,采用Lo-gistic方程拟合精度较高.种源枝叶生长的变异以北带种源南移种植后,上抽时间提早,生长期延长.影响秆高生长的主要气象因子:旬平均气温＞旬最低气温＞旬降雨量.中带种源在漳州点受气象因子影响最明显.

A Study on the Growth Pattern of Bamboo Shoots and Young Bamboos of Dendrocalamus latiflorus from Different Geographical Provenances

A plantation experiment of Dendrocalamus latiflorus from different geographical provenances was undertaken in both Zhangzhou and Yongan,Fujiang Province. The phenology of bamboo shoots was recorded. The variation in the elongation of bamboo stems and the growth pattern of bamboo branches and leaves were investigated. The influences of meteorological factors on the height growth of young bamboos were analyzed. The results showed that in Zhangzhou the Dendrocalamus latiflorus from Middle Fujiang had the best adaptability, sprouting evenly in a longer period with a higher survival rate, having a moderate base diameter. While, in Yongan the Dendrocalamus latiflorus from North Fujiang, especially that from Feiluan, had the longest sprouting period and the biggest base diameter. The height growth of all geographical provenances fitted to the sigmoid curve, which can be well described by Logistic equation. When the Dendrocalamus latiflorus was introduced from North Fujiang to South Fujiang, the branching and leaf outspreading time might become earlier and the growth span might be elongated. The meteorological factors influenced the height growth of Dendrocalamus latiflorus in descendant order included decade average temperature, decade minimum temperature and decade rainfall. The growth of Dendrocalamus latiflorus from Middle Fujiang was apparently influenced by the meteorological factors.