雷州半岛轮伐期内尾细桉人工林土壤有机碳储量变化特征及其影响因素  

Characteristics and Influencing Factors of Soil Organic Carbon Storage in Eucalyptus urophylla×E.tereticornis Plantations during Rotation Period in Leizhou Peninsula

作　　者：许宇星[1] 竹万宽[1] 王志超[1] 黄润霞 杜阿朋[1] XU Yuxing;ZHU Wankuan;WANG Zhichao;HUANG Runxia;DU Apeng(Research Institute of Fast-growing Trees,Chinese Academy of Forestry,Zhanjiang 524022,Guangdong,China)

机构地区：[1]中国林业科学研究院速生树木研究所,广东湛江524022

出　　处：《桉树科技》2024年第3期10-14,共5页Eucalypt Science & Technology

基　　金：广西重点研发计划(桂科AB23026010);广东省林业科技创新项目(2022KJCX020);广东湛江桉树林生态系统国家定位观测研究站运行补助项目(KS2024160017);林业生态监测网络平台运行项目数据采集(2024CG232)。

摘　　要：以广东湛江雷州半岛轮伐期内(1、3、5、7、8年)尾细桉人工林土壤为研究对象,对0~100 cm土层土壤有机碳质量分数、有机碳密度及有机碳储量进行调查分析,以期为提出健康可持续的桉树人工林经营策略提供理论依据。结果表明:不同林龄桉树人工林土壤有机碳质量分数具有明显的垂直分布特征,随着土层深度的增加,土壤有机碳质量分数显著下降,从0~20 cm土层的3.45~7.31 g·kg^(-1)下降至80~100 cm土层的1.90~3.01 g·kg^(-1);随土层深度增加,土壤有机碳密度及土壤碳储量均呈现显著下降趋势,1 m深土层有机碳储量主要集中在0~40 cm,占总土壤碳储量比达到46.90%~53.00%。随林龄增加,土壤有机碳质量分数、有机碳密度及有机碳储量均呈现先显著下降而后显著上升的趋势,且在5年生桉树人工林土壤中出现最低值,各龄级桉树人工林0~100 cm土层土壤碳储量具体表现为从1年生到5年生显著下降,而从5年生到8年生显著回升的趋势。土壤全氮、土壤容重以及土壤含水量作为关键环境因子显著影响土壤有机碳质量分数及碳储量。This study investigated the soil of Eucalyptus plantations at various rotation ages(1,3,5,7,and 8 years)on the Leizhou Peninsula in Zhanjiang,Guangdong.It analyzed soil organic carbon concentration,organic carbon density,and organic carbon storage in the 0~100 cm soil layer of E.urophylla×E.tereticornis plantations to provide theoretical support for sustainable Eucalyptus plantations management strategies.The results revealed a pronounced vertical distribution of soil organic carbon content with different stand ages,which decreased significantly with soil depth—from 3.45~7.31 g·kg^(-1) in the 0~20 cm layer to 1.90~3.01 g·kg^(-1) in the 80~100 cm layer.Soil organic carbon density and carbon storage also decline with increasing depth,with 46.90%to 53.00%of the 1 m deep carbon storage concentrated in the 0~40 cm layer.As plantation age increased,soil organic carbon content,density,and storage initially decreased significantly,then rose,with the lowest values found in the 5-year-old plantations.The carbon storage in 0~100 cm layer for each age group showed a significant decrease from 1 to 5 years old and a significant recovery from 5 to 8 years old.Key environmental factors,including soil total nitrogen,bulk density,and moisture content,significantly influence soil organic carbon content and storage.

关 键 词：尾细桉 林龄 有机碳质量分数 有机碳密度 有机碳储量 

分 类 号：S714.5[农业科学—林学]