欢迎访问《应用生态学报》官方网站,今天是 分享到:

应用生态学报 ›› 2002, Vol. ›› Issue (7): 777-780.

• 研究论文 • 上一篇    下一篇

藏东南亚高山冷杉林林隙特征与干扰状况研究

罗大庆1, 郭泉水2, 薛会英1, 边巴多吉1   

  1. 1. 西藏高原生态研究所, 林芝 860000;
    2. 中国林业科学院森林生态环境与保护研究所, 北京 100091
  • 收稿日期:2001-04-11 修回日期:2001-07-23
  • 通讯作者: 罗大庆,男,1969年生,助理研究员,主要从事西藏森林生态研究.已在国内外发表学术论文6篇.E-mail:dqluo0894@163.com
  • 基金资助:
    国家林业局重点资助项目和西藏自治区科技厅资助项目

Characteristics and disturbance status of gaps in subalpine fir forest in Southeast Tibet

LUO Daqing1, GUO Quanshui2, XUE Huiying1, Bianbaduoji 1   

  1. 1. Institute of Tibet Plateau Ecology, Linzhi 860000;
    2. Institute of Forest Ecological Environment and Protection, Chinese Academy of Forest, Beijing 100091
  • Received:2001-04-11 Revised:2001-07-23

摘要: 从林隙的大小结构、干扰频率、形成方式及林隙内形成木的数量特征等几个方面,对藏东南色季拉山亚高山冷杉林的典型群落类型———藓类冷杉林的林隙干扰状况进行了分析.结果表明,在冷杉林中,扩展林隙(EG)和冠空隙(CG)的面积分别占林分总面积的41.73%和14.71%;平均每年有0.82%的林分面积转化为扩展林隙,0.29%的林分面积转化为冠空隙;每年1hm2面积上约有0.31个林隙形成;林隙的干扰周期为345年.在调查的16个林隙中,共有形成木(GM)78株,平均每个林隙中有4.88株.形成林隙最主要的方式是形成木的折倒,其次为拔根和枯立,主要外力作用是大风.当主林层林木直径达到40~60cm、高度15~20m时,形成林隙的可能性最大;同一林隙常常受到形成木多种死亡方式的影响,且形成时期各不相同.藏东南亚高山冷杉林林隙由不同年代的多次干扰而形成.

关键词: 林隙, 干扰状况, 藏东南, 冷杉林, 三峡库区, 时间序列, 人类活动, 遥感, 土地利用/覆盖变化

Abstract: Characteristics and disturbance status of gaps,including gap size,disturbance frequency, forming patterns of gaps, and quantity of the tree in gap, in subalpine fir forest in Southeast Tibet were studied.The results showed that expanded gaps accounted for 41.73% and canopy gaps accounted for 14.71% of land area in the forest. Averagely, 0.82% and 0.29% of forest area were transformed into expanded and canopy gaps every year. The velocity of gap forming was 0.31 ind·hm-2·yr-1. The disturbance cycle of gaps was 345yr. Among16 investigated gaps,there were 78 gap-markers in total, and there were averagely 4.88 trees in each gap. The main reasons of gap forming were gap-markers fallen as well as uprooted and withered,and their external force was strong wind. The possibility of gaps forming reached the maximum while the diameter of arbors was 40~60 cm and the high was 15~20m in the main forest layer. Gaps were formed by many distubances in different age in the subalpine fir forest in Southeast Tibet.

Key words: Gap, Disturbance status, Southeast Tibet, Fir forest, land use/cover change, time series, the Three Gorges Reservoir Area, remote sensing, human activities

中图分类号: