切根、截顶对湿地松裸根苗生长调控效果的研究

在江西景德镇和安徽泾县布置了１年生湿地松裸根苗生长后期切和截顶试验，研究其对苗木形态和造林表现的效应及其例题应用制度。两年的结果表明，切根苗的高、径及主根形态指标均低于未切根苗，而侧须根系增加，早切根多次切根处理效应最显著。

Study on the Conditioning Effects of Undercutting and Top-pruning on Slash Pine Bareroot Seedlings

Bareroot slash pine seedlings were subjected to undercutting and top pruning treatments including different executing time and frequency,to evaluate the effects on seedling morphology and field performance.The results showed that undercutting treatmens reduced seedling height and diameter,and improved root fibrosity,earlier and multiple ones had more pronounced effects,undercutted seedlings displayed better growth than the control and higher survival rate on dry or severely vegetation competitive sites.Top pruned seedlings were smaller,but there were no negative effects from top pruning on field performance,the seedling uniformity were increased due to the small seedlings free of depression,but later top pruning was harmful to seedling bud formation timely.The application principles of the treatments as cultural practices were proposed.