闽东秋茄(Kandelia candel)人工林与天然林异龄叶性状比较

摘要

In the paper,the experiments were conducted to compare the foliar traits of uneven-aged leaves of Kandelia candel plantations and natural forests in the eastern regions of Fujian Province.The results showed that:(1) The leaf MLA,SLA and LDMC of the two kinds of K.candel forests were all higher in current-year than those in former-year leaves,respectively (38.4 cm2＞36.0 cm2),(78.9 m2/kg＞67.5 m2/kg),(258.7 mg/g＞193.8 mg/g).(2) The MLA in both current-and former-year leaves of the plantation were significantly higher than those of the natural forest,respectively (40.7 cm2＞36.1 cm2),(37.5 cm2＞34.4 cm2).The leaf SLA of the plantation was higher in current-year leaves of the natural forest (78.4 m2/kg＜79.4 m2/kg),while former-year leaves showed the reverse trend (71.0 m2/kg＞64.0 m2/kg).The leaf LDMC was greater in the plantation than the natural forest in current-year and former-year leaves,respectively (344.4 mg/g＞173.0 mg/g),(225.6 mg/g＞162.0 mg/g).The study showed it was the result of adaptive evolution for uneven-aged leaves to hold investment trade-off between light resources acquisition and material storage to build leaf organs in various habitats.The K.candel could adjust live strategies to cope with stressed factors and develop strong environment adaptability,and therefore K.candel was suitable to be planted as the coastal shelter forest trees.%比较闽东不同生境秋茄[Kandelia candel (Linn.) Druce]人工林与天然林异龄叶性状间的相互关系,结果显示:(1)2种林分的秋茄林叶MLA、SLA和LDMC,当年生均大于往年生,分别为MLA(38.4 cm2＞36.0 cm2)、SLA(78.9 mVkg＞67.5 m2/kg)、LDMC(258.7 mg/g＞193.8 mg/g);(2)当年生和往年生叶MLA人工林均大于天然林,分别为当年生(40.7 cm2＞36.1 cm2)、往年生(37.5 cm2＞34.4 cm2).当年生叶SLA人工林小于天然林,为(78.4 m2/kg＜79.4 m2/kg),往年生叶SLA人工林大于天然林,为(71.0 m2/kg＞64.0 m2/kg).当年生与往年生叶LDMC人工林均大于天然林,分别为当年生(344.4 mg/g＞ 173.0 mg/g)、往年生(225.6 mg/g＞162.0 mg/g).研究表明,异龄叶对光资源获取和储存物质以构建叶器官这2种投资策略的权衡,是植物在各自生境中适应性进化的结果.秋茄能对生境因子胁迫调整生活策略应对,具有较强的环境适应性,适宜作为海岸防护林树种人工栽植.