文献类型：期刊文献

中文题名：兴安落叶松生态系统CO_(2)浓度及其δ^(13)C动态对环境因子的响应

英文题名：CO_(2)Concentration and theδ^(13)C Dynamics in Larix gmelinii Ecosystem in Response to Environmental Factors

作者：张欣[1,2] 张秋良[2,3] 孙守家[4] 王冰[2]

第一作者：张欣

机构：[1]内蒙古大学生态与环境学院,呼和浩特010021;[2]内蒙古农业大学林学院,呼和浩特010019;[3]内蒙古大兴安岭森林生态系统国家野外科学观测研究站,根河022350;[4]中国林业科学研究院林业研究所,北京100091

年份：2023

卷号：59

期号：9

起止页码：55-65

中文期刊名：林业科学

外文期刊名：Scientia Silvae Sinicae

收录：CSTPCD;;EI(收录号：20234715073282);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

基金：内蒙古自治区科技计划项目(2023YFDZ0026);国家自然科学基金项目(32060262,32260389)。

语种：中文

中文关键词：CO_(2)浓度;碳同位素;环境因子;兴安落叶松;

外文关键词：CO_(2)concentration;carbon isotope;environmental factors;Larix gmelinii

分类号：S757.3

摘要：【目的】探明环境因子对兴安落叶松原始林生态系统CO_(2)浓度及其δ^(13)C动态的影响,深入理解生态系统的碳交换过程,为模拟和预测全球变化与生态系统之间的互馈机制以及科学评估寒温带森林生态系统碳汇能力提供参考。【方法】采用离轴积分腔输出光谱技术对兴安落叶松生态系统不同物候期、不同高度的CO_(2)浓度及其δ^(13)C进行连续高频观测,并分析环境因子与CO_(2)浓度变化的关系。【结果】1)兴安落叶松生态系统不同高度的CO_(2)浓度在生长季和日尺度上均呈单峰变化,峰值分别出现在展叶期(522.34μmol·mol^(-1))和凌晨(782.81μmol·mol^(-1)),谷值分别出现在落叶期(406.07μmol·mol^(-1))和中午(379.72μmol·mol^(-1));δ^(13)C变化趋势与CO_(2)浓度相反;2)CO_(2)浓度随垂直高度升高而减小,δ^(13)C随垂直高度升高而增大;不同高度的CO_(2)浓度及其δ^(13)C具有明显成层现象,夜间大气稳定性增加(理查逊数Ri≥0.083)会加剧冠层内外的差异;3)在0.5h尺度上,影响昼夜各高度CO_(2)浓度变化的主要因子为空气温度(T_(a))(0.714【Objective】This study aims to explore the influence mechanism of environmental factors on the CO_(2)concentration andδ^(13)C dynamics in Larix gmelinii ecosystem,which would help to deeply understand the process and mechanism of carbon exchange in ecosystems,so as to provide reference for simulating and predicting the mutual feedback mechanism between global change and ecosystems,as well as for scientific assessment of carbon sink capacity of cold temperate forest ecosystems.【Method】The off-axis integral cavity output spectroscopy was used to perform continuous high-frequency observations to the CO_(2)concentration andδ^(13)C value at different heights in different phenological periods of L.gmelinii ecosystem,and thereby analyze the relationship between environmental factors and CO_(2)concentration.【Result】1)The CO_(2)concentration at different heights of L.gmelinii ecosystem showed a single peak variation in the growth season and daily scale.The peak value appeared in the leaf spreading period(522.34μmol·mol^(-1))and at night(782.81μmol·mol^(-1)),respectively.The valley value appeared in the leaf falling period(406.07μmol·mol^(-1))and at noon(379.72μmol·mol^(-1)),respectively.Theδ^(13)C variation was opposite to CO_(2)concentration.2)The CO_(2)concentration decreased with the increase of vertical height,whileδ^(13)C increased with the increase of vertical height.The CO_(2)concentration andδ^(13)C at different heights had obvious stratification.The increase of atmospheric stability at night(Ri≥0.083)increased the difference inside and outside the canopy.3)On the 0.5 h scale,air temperature(T_(a))was the main factor affecting the variation of CO_(2)concentration at different heights in day and night(0.714