中亚热带常绿阔叶林不同演替阶段细根生物量变化  

Root Biomass of Mid-Subtropical Evergreen Broad-Leaved Forest During Natural Succession

作　　者：曹丽荣 陈蓉[1,2] 陈铭 姚晓东 王小红[1,2] 陈光水 CAO Lirong;CHEN Rong;CHEN Ming;YAO Xiaodong;WANG Xiaohong;CHEN Guangshui(Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education,Fujian Normal University,Fuzhou 350117,China;School of Geographical Sciences,Fujian Normal University,Fuzhou 350117,China)

机构地区：[1]福建师范大学湿润亚热带生态地理过程教育部重点实验室,福州350117 [2]福建师范大学地理科学学院,福州350117

出　　处：《亚热带资源与环境学报》2023年第1期34-40,共7页Journal of Subtropical Resources and Environment

基　　金：国家重点研发项目子课题(2021YFD220040303)。

摘　　要：为揭示亚热带常绿阔叶林细根生物量随演替序列的动态变化特征,选取15年生、47年生和110年生(分别为演替的初、中、中后期)的常绿阔叶林为研究对象,采用根钻法对细根(<2 mm)的生物量、死/活生物量比例、径级和垂直分布进行研究。结果表明:活细根生物量、死细根生物量及死/活生物量比值随林分演替序列而显著增加,演替中后期的活细根、死细根生物量和死/活生物量比分别较演替初期高1.3、23.2和1.8倍。0~1 mm细根的生物量及死/活生物量比值均显著高于1~2 mm细根。演替中期和中后期的0~1 mm活细根生物量占活细根总生物量平均比演替初期高22%,差异显著。细根生物量随土层加深而显著下降;随着林分演替的进行,细根生物量更趋于表层分布。演替阶段对亚热带常绿阔叶林细根生物量变化有显著影响,说明林分在不同演替阶段捕获资源的方式存在差异。Three subtropical evergreen broad-leaved forests with different succession stages were selected to investigate the biomass,dead:living biomass ratio,size class distribution,and vertical distribution of fine roots(<2 mm diameter)by using the sequential root coring.They are 15 a,early-successional stage;47 a,mid-successional stage;and 110 a,late-successional stage respectively,in Wanmulin Forest Nature Reserve,Jian ou city,Fujian province.The purpose is to reveal the dynamic characteristics of fine root biomass in subtropical evergreen broad-leaved forest.Results showed that the biomass of dead and living fine roots and their ratio increased with the succession stage developing.Compared with the 1~2 mm fine roots,0~1 mm fine roots had higher total biomass and dead:living biomass ratio.Compared with the early-successional stage,the mid-successional and late-successional stages had significantly higher proportion of 0~1 mm living fine root biomass to total living fine root biomass.Fine root biomass decreased with increasing soil depth and moreover,fine roots tended to be more superficial along the succession developing.These results can be used to predict the fine root dynamics,and thus,to understand the belowground carbon and nutrient cycling in subtropical evergreen broad-leaved forests.The succession stage had a significant effect on the dynamic characteristics of fine root biomass of subtropical evergreen broad-leaved forest,indicating that the forest had different ways of capturing resources at different succession stages.

关 键 词：常绿阔叶林 细根 径级 垂直分布 演替阶段 

分 类 号：S154.1[农业科学—土壤学]