文献类型：期刊文献

中文题名：尾叶桉人工林不同深度土壤CO_(2)通量

英文题名：Soil CO_(2)fluxes at different depths in Eucalyptus urophylla plantations

作者：张天翼[1] 黄润霞[1] 许宇星[1] 王志超[1] 杜阿朋[1] 竹万宽[1]

第一作者：张天翼

机构：[1]中国林业科学研究院速生树木研究所/广东湛江桉树林生态系统定位观测研究站,广东湛江524022

年份：2026

卷号：43

期号：2

起止页码：1-9

中文期刊名：桉树科技

外文期刊名：Eucalypt Science & Technology

基金：国家重点研发计划项目(2023YFD2201005);广西科技计划项目(桂科AB23026010);广东湛江桉树林生态系统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(2024CG232)。

语种：中文

中文关键词：尾叶桉人工林;土壤CO_(2)通量;土壤温度;土壤湿度

外文关键词：Eucalyptus urophylla plantation;soil CO_(2)flux;soil temperature;soil humidity

分类号：S714.2

摘要：为深入探究桉树人工林土壤碳循环过程,以雷州半岛北部尾叶桉(Eucalyptus urophylla)人工林为研究对象,采用LI-8150土壤碳通量自动测量系统监测10、30、50、75、100 cm深度土壤CO_(2)浓度与温、湿度,结合Fick第一扩散定律(选用5种ε模型)及腔室法,分析不同深度土壤CO_(2)通量变化规律及对土壤温、湿度变化的响应。结果表明:腔室法测定的表层CO_(2)通量高于扩散法计算的10 cm深度通量;各深度土壤CO_(2)浓度随土层加深而升高,日均值从10 cm的2281.91μmol·mol^(-1)增至100 cm的21320.26μmol·mol^(-1),而CO_(2)通量随土层加深显著递减,日均值从10 cm的3.19μmol·m^(-2)·s^(-1)降至100 cm的1.92μmol·m^(-2)·s^(-1),且两者日变化均呈单峰趋势,峰值均出现在16:00;土壤温、湿度对CO_(2)通量的影响存在深度差异,10~50 cm浅层土壤CO_(2)通量受土壤温、湿度共同调控且温度占主导(10 cm处R^(2)=0.7490),温度敏感性系数Q10随土层加深从4.8259降至1.6177,75~100 cm深层土壤CO_(2)通量主要受土壤湿度调控(100 cm处R^(2)=0.4757)。
To further investigate the soil carbon cycling process in eucalypt plantations,Eucalyptus urophylla plantations were selected as the research objects in the north of Leizhou Peninsula.The LI-8150 soil CO_(2)flux automatic measurement system was employed to monitor soil CO_(2)concentration,temperature,and humidity at depths of 10,30,50,75,and 100 cm.The Fick's first diffusion law(using fiveεmodels)and the chamber method were combined to analyze the variation of soil CO_(2)flux at different depths and its response to soil temperature and humidity.The results showed that the CO_(2)flux measured by the chamber method was higher than that calculated by the diffusion method at 10 cm depth.Soil CO_(2)concentration increased with depth,with daily average values ranging from 2281.91μmol·mol^(-1)at 10 cm to 21320.26μmol·mol^(-1)at 100 cm.The CO_(2)flux decreased significantly with depth,from 3.19μmol·m^(-2)·s^(-1)at 10 cm to 1.92μmol·m^(-2)·s^(-1)at 100 cm.Both CO_(2)concentration and flux exhibited a unimodal daily variation,with peaks at 16:00.The influence of soil temperature and humidity on CO_(2)flux varied with depth.In the shallow layers(10-50 cm),CO_(2)flux was primarily regulated by temperature(R^(2)=0.7490 at 10 cm),with the temperature sensitivity coefficient Q10 decreasing from 4.8259 to 1.6177 with depth.In the deeper layers(75-100 cm),CO_(2)flux was mainly regulated by soil humidity(R^(2)=0.4757 at 100 cm).