中亚热带米槠天然林粗木质残体储量特征  

Coarse Woody Debris Storage in a Natural Forest Dominated by Castanopsis carlesii in Mid-subtropical China

作　　者：唐玉祥 胥超[1,2] 熊德成[1,2] 时应贵 吴帆 杨智杰[1,2] TANG Yuxiang;XU Chao;XIONG Decheng;SHI Yinggui;WU Fan;YANG Zhijie(School of Geographical Sciences,Fujian Normal University,Fuzhou 35007,China;State Key Laboratory of Subtropical Mountain Ecology(Funded by Ministry of Science and Technology and Fujian Province),Fujian Normal University,Fuzhou 35007,China)

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

出　　处：《亚热带资源与环境学报》2021年第2期32-37,共6页Journal of Subtropical Resources and Environment

基　　金：国家自然科学基金项目(31670623)。

摘　　要：粗木质残体(coarse woody debris,CWD)是森林生态系统的重要组成部分,在森林生态系统的结构性和功能性方面有着重要的作用。以福建三明米槠(Castanopsis carlesii)天然林为研究对象,采用样方法调查了样地内粗木质残体的分解等级和径级分布,研究米槠天然林粗木质残体的储量特征。结果表明:(1)米槠天然林粗木质残体储量为16.13 t·hm^(-2)。其中,倒木是主要贡献者,占粗木质残体储量的55.13%;其次为枯立木,占粗木质残体储量的44.87%。(2)样地内倒木和枯立木的储量均随着径级的增加而逐渐增大,在20~40 cm径级占据优势地位,分别达到倒木和枯立木储量的48.86%和66.25%。(3)样地内倒木Ⅴ分解等级超过60%,处于分解的后期,是倒木的主要部分,可能是由于本区较好的水热条件,促进了微生物对粗木质残体的分解作用。总体而言,米槠天然林粗木质残体储量低于亚热带常绿阔叶林的平均水平,这与天然林年龄、自然干扰和气候等紧密相关。因此,未来应加强对亚热带不同区域不同森林类型的粗木质残体储量进行研究。Coarse woody debris(CWD)plays an essential role in forest ecosystem,which constitutes 7%~20%of carbon(C)in forest.We surveyed the diameter classes and the degree of decomposition of CWD in a mid-subtropical natural forest dominated by Castanopsis carlesii.Results indicate that:(1)The storage of CWD is 16.13 t·hm^(-2),of which the log and snag contributed 55.13%and 44.87%,respectively;(2)The storages of log and snag were higher at large diameter class,in which the 20~40 cm diameter class of CWD is the primary component in these sites,occupying 48.86%and 66.25%of total CWD storage,respectively;(3)TheⅤdecay class is the main decay class,which occupied more than 60%of log storage,indicated that the good conditions of temperature and humidity leading to high microbial activity and stimulate microbial decomposition of CWD.Furthermore,the low CWD storage and high decay degree of CWD related to forest age,natural disturbance and climate.Therefore,we involved a more work on the study of CWD in different forest types and regions in subtropical forests.

关 键 词：天然林 米槠 粗木质残体 亚热带 

分 类 号：S75[农业科学—森林经理学]