闽北闽粤栲天然林林隙特征及干扰状况  

Characteristics and disturbance regimes of gaps in Castanopsis fissa natural forest in the north Fujian

作　　者：苏凌燕 郑德祥[1] 钟兆全 詹旋常 吴文斌[1] 缪三华[1] 

机构地区：[1]福建农林大学林学院,福建福州350002 [2]顺昌国有林场,福建顺昌353200

出　　处：《森林与环境学报》2015年第2期125-130,共6页Journal of Forest and Environment

基　　金：福建省教育厅资助项目(JA12112);福建农林大学校重点项目建设专项(6112C035H)

摘　　要：研究林隙结构对天然林更新演替具有重要意义,以闽北闽粤栲天然林林隙的基本特征及干扰状况为研究对象,通过对闽北闽粤栲天然林中的28个林隙进行调查,进而分析其林隙大小结构、年龄结构、形成方式、形成木特征及干扰规律。结果表明,在闽北闽粤栲天然林中,冠林隙中10-20 m2所占的数量比例和面积比例都是最大的。扩展林隙个数以<50 m2所占的数量比例最大,以50-100 m2所占的面积比例最大。林隙年龄以10-15 a所占的数量比例最大。林隙形成方式主要是折干与掘根风倒共同作用,占总株数的57.14%。林隙多由1-4株形成木形成的,平均每个林隙有4.04株形成木,形成木的径级以10、20 cm为主,占82.30%。林隙的线状密度为12.84个·km-1,冠林隙和扩展林隙的形成速率分别为2.08和7.02 m·km-1·a-1。林隙干扰的周期为476.19 a。The study of gap structure has important significance for natural forest regeneration and succession. Taking the general characteristics and disturbance regimes of the gaps in Castanopsisfissa natural forest as the research objects, their size structure, age structure, gap formation manner, the characteristics of gap makers, as well as the disturbance regimes were analyzed through the investigation of 28 gaps in Castanopsisfissa natural forest in northern Fujian. The results showed that the canopy gaps from 10 m2 to 20 m2 accounted for the highest percentage in number and size. For expanded gaps, the gaps larger than 50 m2 had the biggest quantity proportion, while the area percentage of the gaps from 50 m2 to 100 m2 was the highest. The biggest proportion of gap age was between 10 and 15 years. The main manner of gap formation in the forest was the combined effect of both stem breakage and uprooting （57.14% of the total）. Most gaps were formed by 1 to 4 gap makers, with an average of 4.04 trees per gap. The diameter at breast height of most gap makers was 10 em and 20 cm, accounted for 82.30% of the total. The linear gap density in the forest was 12.84 gaps -km -1, the formation rates of canopy gaps and expanded gaps were 2.08 m＇km -1·a-1and 7.02 m·km -1·a -1 respec- tively, and the disturbance cycle of gaps was 476.19 years.

关 键 词：闽粤栲 林隙 自然干扰 天然林 

分 类 号：S718.5[农业科学—林学]