大兴安岭多年冻土泥炭地土壤水可溶性有机碳夏秋季节变化特征及其影响因素

doi:10.13287/j.1001-9332.202309.015

应用生态学报 ›› 2023, Vol. 34 ›› Issue (9): 2413-2420.doi: 10.13287/j.1001-9332.202309.015

大兴安岭多年冻土泥炭地土壤水可溶性有机碳夏秋季节变化特征及其影响因素

姜静宜^1,2, 孙晓新^1,3*, 王宪伟², 王淑洁^1,2, 马国宝^1,2, 陈宁², 杜宇²

¹东北林业大学林学院, 森林生态系统可持续经营教育部重点实验室, 哈尔滨 150040;
²中国科学院东北地理与农业生态研究所, 中国科学院湿地生态与环境重点实验室, 长春 130102;
³黑龙江三江平原湿地生态系统国家定位观测研究站, 黑龙江抚远 156500

收稿日期:2023-03-15 修回日期:2023-07-22 出版日期:2023-09-15 发布日期:2024-03-16
通讯作者: *E-mail: sunxiaoxin@nefu.edu.cn
作者简介:姜静宜, 女, 1999年生, 硕士研究生。主要从事湿地碳循环研究。E-mail: jiangjy@nefu.edu.cn
基金资助:
国家自然科学基金项目(41971143、42271111)和吉林省自然科学基金项目(YDZJ202201ZYTS477)

Seasonal variation characteristics and influencing factors of dissolved organic carbon of soil water in permafrost peatlands of the Great Hing’an Mountains in summer and autumn

JIANG Jingyi^1,2, SUN Xiaoxin^1,3*, WANG Xianwei², WANG Shujie^1,2, MA Guobao^1,2, CHEN Ning², DU Yu²

¹Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management, School of Forestry, Northeast Forestry University, Harbin 150040, China;
²Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China;
³Heilongjiang Sanjiang Plain Wetland Ecosystem National Positioning Observation and Research Station, Fuyuan 156500, Heilongjiang, China

Received:2023-03-15 Revised:2023-07-22 Online:2023-09-15 Published:2024-03-16

摘要/Abstract

摘要： 可溶性有机碳对泥炭地温室气体排放与碳收支评估有重要影响。然而关于大兴安岭多年冻土区泥炭地不同深度土壤水可溶性有机碳(DOC)含量与性质的季节动态变化规律研究较少。本研究选择大兴安岭多年冻土区(图强林业局)泥炭地为研究对象,分析泥炭地不同深度土壤水(地表、10 cm、20 cm、30 cm、40 cm、冻土层)DOC含量的季节变化规律及其影响因素(电导率、溶解氧含量、HCO₃^-含量、pH值、氧化还原电位和CO₂含量),利用紫外-可见光谱分析DOC的稳定性。结果表明: 土壤水DOC含量具有显著的季节动态变化规律,秋季高、夏季低,含量变化范围为55.7～188.1 mg·L^-1;不同深度土壤水DOC含量差异显著,以冻土层最高。DOC含量与pH值、电导率呈极显著正相关,与氧化还原电位、HCO₃^-含量呈极显著负相关,与溶解氧含量呈显著负相关,与CO₂含量呈显著正相关。泥炭地土壤水溶解CO₂含量随土层深度增加而增加,冻土层水体CO₂含量最高。光谱分析显示,秋季DOC中芳香性程度均高于夏季,表明秋季DOC更稳定。本研究明确了大兴安岭多年冻土泥炭地土壤水DOC的夏秋季节变化特征,可为深入认知该区域泥炭地碳循环过程提供重要数据支持。

关键词: 大兴安岭, 泥炭地, 多年冻土, 可溶性有机碳, 季节动态变化

Abstract: Dissolved organic carbon (DOC) plays a crucial role in the assessment of greenhouse gas emission and carbon balance in peatlands. However, limited research has been conducted on the seasonal variations and properties of soil water DOC content at different depths in the permafrost peatlands of the Great Hing’an Mountains. In this study, we analyzed the seasonal patterns of soil water DOC contents (surface, 10 cm, 20 cm, 30 cm, 40 cm, and permafrost layer) the permafrost peatlands of the Great Hing’an Mountains (Tuqiang Forestry Bureau), and investigated the influencing factors, such as electrical conductivity, dissolved oxygen, HCO₃^- concentration, pH value, oxidation-reduction potential, and CO₂ content. The stability of DOC was assessed by using UV-Vis spectrum. There were significant seasonal dynamics of DOC content in soil water, with higher contents in autumn and lower content in summer, ranging from 55.7 to 188.1 mg·L^-1. There were significant differences in DOC content among different soil depths, with the highest levels detected in the permafrost layer. The DOC content showed a significantly positive correlation with pH value and electrical conductivity, while showed a significantly negative correlation with redox potential, HCO₃^- concentration, and dissolved oxygen content. Additionally, there was a significantly positive correlation between DOC and CO₂ contents. The dissolved CO₂ content in soil water increased with soil depth, with the highest content observed in the permafrost layer. Results of spectral analysis showed higher aromaticity in autumn compared to summer, indicating greater stability of DOC during the autumn season. Our results clarified the seasonal variations of soil water DOC in permafrost peatlands of the Great Hing’an Mountains and could provide important data to understand the carbon cycling in the region.

Key words: the Great Hing’an Mountains, peatland, permafrost, dissolved organic carbon, seasonal dynamic change

姜静宜, 孙晓新, 王宪伟, 王淑洁, 马国宝, 陈宁, 杜宇. 大兴安岭多年冻土泥炭地土壤水可溶性有机碳夏秋季节变化特征及其影响因素[J]. 应用生态学报, 2023, 34(9): 2413-2420.

JIANG Jingyi, SUN Xiaoxin, WANG Xianwei, WANG Shujie, MA Guobao, CHEN Ning, DU Yu. Seasonal variation characteristics and influencing factors of dissolved organic carbon of soil water in permafrost peatlands of the Great Hing’an Mountains in summer and autumn[J]. Chinese Journal of Applied Ecology, 2023, 34(9): 2413-2420.

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大兴安岭多年冻土泥炭地土壤水可溶性有机碳夏秋季节变化特征及其影响因素

Seasonal variation characteristics and influencing factors of dissolved organic carbon of soil water in permafrost peatlands of the Great Hing’an Mountains in summer and autumn

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