不同林龄的天然次生林和杉木人工林恢复过程中凋落物量变化  

Changes of Litterfall Amount in Natural Secondary Forests and Chinese Fir Plantations of Different Forest Ages During the Restoration Process

作　　者：冉松松 许子君 万晓华[1,2] RAN Song-song;XU Zi-jun;WAN Xiao-hua(School of Geographical Science, Fuzhou Normal University, Fuzhou, Fujian 350007, China;Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou, Fujian 350007, China)

机构地区：[1]福建师范大学地理科学学院,福建福州350007 [2]湿润亚热带山地生态国家重点实验室培育基地,福建福州350007

出　　处：《福建农业科技》2022年第1期59-65,共7页Fujian Agricultural Science and Technology

基　　金：国家自然科学基金项目(31570604、31600495)。

摘　　要：凋落物作为森林生产力的重要表现,其产量是调控森林生产力和生态系统物质循环的重要因子。以皆伐后,不同年龄自然恢复的天然次生林和人工恢复的杉木林为研究对象,旨在探讨天然次生林与杉木人工林的森林生产力变化规律与差异。结果表明:天然次生林凋落物年生产量5.1~8.2 t·hm^(-2),且随林龄增加而显著增加;杉木人工林年凋落物年生产量为2.0~3.1 t·hm^(-2),且不同林龄之间差异并不显著。两种恢复模式下,各林龄阶段的凋落物均以凋落叶为主,凋落物各组成比例顺序依次为叶>杂>枝。在同一林龄阶段,天然次生林凋落物各组成年产量均显著大于杉木人工林。结果表明,与人工林相比,自然恢复模式更有利于凋落物量的增加,有利于森林生产力和土壤肥力的维持。Litterfall is an important manifestation of forest productivity,and its yield is an important factor in regulating the forest productivity and the material cycle of ecosystem.By taking the natural secondary forests and the artificial restored Chinese fir forests at different ages after clear cutting as the research objects,the variation rules and differences of forest productivity between the natural secondary forests and Chinese fir plantations were explored.The results showed that the annual production of litterfall in the natural secondary forests ranged from 5.1 t·hm^(-2) to 8.2 t·hm^(-2),and increased significantly with the increase of forest age.The annual production of litterfall in Chinese fir plantations ranged from 2.0 t·hm^(-2) to 3.1 t·hm^(-2),and there was no significant differences between different forest ages.Under the two restoration modes,the litterfall at each forest age stage was dominated by leaf litters,and the composition proportion of litterfall was in the order of leaf>miscellany>branch.At the same forest age stage,the annual production of each component of litterfall in the natural secondary forests was significantly higher than that in Chinese fir plantations.The results showed that compared with the plantations,the natural restoration mode was more beneficial to the increase of litterfall production and the maintenance of forest productivity and soil fertility.

关 键 词：凋落物生产量 林龄 恢复 天然林 杉木林 

分 类 号：S791.27[农业科学—林木遗传育种]