【摘要】 对11年生龙眼成年树与4年生龙眼幼年树的凋落物和凋落叶养分含量的动态变化及养分贮量进行了研究。结果表明,成年树和幼年树的年凋落量分别为42 996g·株-1和 3 683g·株-1;成年树在8月有单一凋落高峰,而幼年树有3个凋落高峰,且分别出现在每年的3、6和8月份;凋落叶P含量季节变化小于N、K;成年树凋落叶N、P含量变化大于幼年树。成年树和幼年树凋落物中N、P、K年贮量分别为867.704g和35.027g,3种养分中年贮量的大小顺序为K>P>N;成年树和幼年树叶片凋落前N、P、K因迁移而导致落叶的N、P、K含量比成熟叶低,但3种元素间有差异。更多还原

【Abstract】 Seasonal dynamics in litterfall. contents of N, P, K in leaf litter and litter nutrient accumulation were studied in mature and young longan orchard systems. Annual litterfall of them were 42962 g and 3683 g respectively. There was a single litterfall peak in August in mature orchard but there were three litterfall peaks in March, June and August in young one. Changes of phosphorus contents were smaller than those of nitrogen and potassium contents in leaf litterfall. Changs of nitrogen and phosphorus contents of mature tree were bigger than those of young tree. The annual N, P,K accumulation of mature and young tree were 867.704 g and 35.027 g respectively. K contents were the highest and P contents were greater than N contents in them. Contents of N, P, K in leaf litterfall of the mature and young tree were smaller than those in leaves that before fallen.更多还原