人促常绿阔叶次生林凋落物数量、组成及动态

对福建省尤溪通过人工促进天然更新形成的常绿阔叶次生林的凋落物数量、组成及季节动态进行研究,结果表明,常绿阔叶次生林年凋落物量为6870kg/hm2,其中落叶量(3964kg/hm2)和落枝量(1621kg/hm2)分别占57.7%和23.6%。米槠、大叶栲、栲树、檫树和南酸枣5个树种年落叶量分别占年总落叶量的41.5%、21.4%、9.0%、6.3%和3.2%。常绿阔叶次生林总凋落量于4月和12月出现峰值,落叶量最大值出现在4月,落枝量在4月、7月和11月出现峰值,落花量主要集中在5月和6月,而落果量则集中在12月。米槠和栲树落叶量最大值分别出现在4月和5月,大叶栲落叶量主要集中在7～9月,檫树和酸枣落叶量最大值分别出现在11月或12月,其他树种落叶量1年中分布则相对较为均匀。

Amount, Component, and Seasonal Pattern of Litterfall in Secondary Evergreen Broadleaved Forest

The amount, component, and seasonal pattern of litterfall in a secondary evergreen broadleaved forest, with artificial aids to natural regeneration, in Youxi, Fujian Province was studied. Annual litterfall of this forest was up to 6 870 kg/hm 2, of which 57.7% and 23.6% comprised leaf-litter and twig-litter, respectively. Castanopsis carlesii,Castanopsis megaphylla, Castanopsis fargesii, Sassafras tzumu and Choerospondias axillaris contributed to 41.5%, 21.4%, 9.0%, 6.3% and 3.2% of the total annual leaf fall. The total litterfall peaked in April and December. The peak was found in April for leaf-litter, in April, July, and November for twig-litter, in May and June for flower-litter, and in December for fruit-litter, respectively. Leaf-litter of C. carlesii and C. fargesii maximized their values in April and May, respectively. Leaf-litter of C. megaphylla mainly occurred during July to September. S. tzumu and C. axillaris had their largest leaf fall in November and December, respectively. In contract, leaf-litter of other tree species occurred more evenly over a year.