刚果12号W_5桉枝、叶凋落物产生的相关因素研究

Study of the Related Factors of Litter from Eucalyptus ABL12

通过全年收集2～6林龄桉树(刚果12号W5无性系)枝、叶凋落物量和测定树冠冠幅,研究了枝、叶凋落物产生的相关规律.结果表明:低温和较低的降雨量以及树冠竞争促使枝、叶凋落物产生,叶凋落物占主要部分;2月和10月以及桉树2林龄和5林龄是枝、叶凋落物产生的月高峰期和林龄高峰期;树冠的竞争促进了枝叶凋落物的产生,树冠扩展时凋落物量最小.认为掌握凋落物月高峰期和林龄高峰期对确定桉树人工林采伐时期和季节以及维护林地养分平衡具有理论和实践意义.

By collecting the amount of litter monthly and measuring the tree crowns for each age period of Eucalyptus ABL12, some researches were conducted to explore the related factors that affect the litter fallen and to master the dynamics of litter production each month. The results show that February and October are the monthly peaktime of litter fallen while the age periods of 2 years. and 5 years are the tree age peaktime, resulting from lower temperature, lower precipitation as well as crown competition and that litter leaves contribute the largest amount of litter fallen. It has been proved that the monthly and tree age peaktime has theoretical and practical significance for deciding harvest time and tree age, and ensuring a nutrient balance of forest soil of Eucalyptus ABL12.