榆林沙区班克松物候及年生长规律观测

Observation on Phenology and Annual Growth Rhythm of Pinus banksiana in Yulin Sandy Land

对榆林沙区2009年引种栽培的班克松进行了连续3年的物候及年生长规律观测。结果表明:班克松在榆林沙区4月上旬芽膨大,4月下旬至5月下旬主梢、枝生长旺盛,年平均生长量主梢47.7cm、侧枝19.9cm,6月中下旬芽完全形成。4月底至6月中旬针叶生长,平均2.63cm。雄球花5月初散粉高峰期,雌球花4月底5月初授粉。5月上中旬幼果形成,二年球果4月底至5月底生长迅速,平均纵径34.15cm,横径17.13cm,9月中旬球果成熟。

The phenology and annual growth rhythm of Pinus banksiana introduced and cultivated in Yulin sand area in 2009 were observed for three consecutive years.The results showed that the buds expanded in early April,the main shoots and branches grew vigorously from late April to late may,the average annual growth was 47.7 cm at the main tips and 19.9 cm at the side branches,and the buds were fully formed in mid-late June.Leaves grew from the end of April to the middle of June,an average of 2.63 cm.The pollen released in peak in early May and pollination of female flowers occurred in late April to early May.The young fruits were formed in the early and middle of May,and the two-year cones grew rapidly from the end of April to the end of May,with an average longitudinal diameter of 34.15 cm and a transverse diameter of 17.13 cm.The cones matured in the middle of September.