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应用生态学报 ›› 2022, Vol. 33 ›› Issue (4): 1074-1082.doi: 10.13287/j.1001-9332.202204.032

• 研究论文 • 上一篇    下一篇

冰川退缩区不同演替阶段土壤溶解性有机质光谱特征及环境响应

梁紫嫣1,2, 李晓明3, 王涛1, 段宝利1, 类延宝1*   

  1. 1中国科学院、水利部成都山地灾害与环境研究所, 成都 610041;
    2中国科学院大学, 北京 100049;
    3中国科学院生态环境研究中心, 北京 100085
  • 收稿日期:2021-08-19 接受日期:2022-02-21 出版日期:2022-04-15 发布日期:2022-05-07
  • 通讯作者: * E-mail: leiyb@cib.ac.cn
  • 作者简介:梁紫嫣, 女, 1997年生, 硕士研究生。主要从事土壤生态学研究。E-mail: liangziyan@imde.ac.cn
  • 基金资助:
    国家自然科学基金项目(31971632)和四川省科技厅项目(2020YFH0215,2021ZHYZ0002,2021YFH0008)资助

Spectral characteristics of dissolved organic matter and its environmental responses across successional stages in a glacier retreat area

LIANG Zi-yan1,2, LI Xiao-ming3, WANG Tao1, DUAN Bao-li1, LEI Yan-bao1*   

  1. 1Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041, China;
    2University of Chinese Academy of Sciences, Beijing 100049, China;
    3Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
  • Received:2021-08-19 Accepted:2022-02-21 Online:2022-04-15 Published:2022-05-07

摘要: 溶解有机质(DOM)作为土壤中最活跃的有机组分,在土壤生物地球化学过程中起着关键作用,探讨植被演替过程中DOM的来源、组成、环境响应与累积规律,对预测土壤碳循环过程具有重要意义。本研究从海螺沟冰川退缩区植被原生演替序列选取演替年龄分别为12、30、40、50、80、120年的样地采集表层和亚表层土壤样本,测定DOM浓度并进行紫外-可见光光谱和三维荧光光谱分析,研究原生演替过程中DOM含量和组成的变化特征及其影响因素。结果表明: 土壤DOM浓度随演替年龄的增加而显著增加。土壤DOM中类蛋白组分、荧光指数和生物指数随演替时间的增加而减小,类腐殖质组分和腐殖化程度随演替过程不断增加,土壤DOM芳香化程度先增加后减小。pH值、铵态氮含量解释了62.2%的表层土壤DOM组分变异,土壤含水率和pH值解释了64.3%的亚表层土壤DOM组分变异,说明环境因素是影响海螺沟冰川退缩区原生演替过程中土壤DOM数量和组成的重要因子。

关键词: 土壤溶解性有机质, 原生演替, 三维荧光光谱, 紫外-可见光光谱, 冰川退缩

Abstract: Dissolved organic matter (DOM), the most active type of soil organic matter, plays a key role in soil biogeochemical cycling. Therefore, exploring the source, composition, environmental response, and accumulation mechanism of DOM during vegetation succession has great significance for predicting soil carbon cycling. In this study, DOM was extracted from topsoil and subsoil at plots after 12, 30, 40, 50, 80, and 120 years of primary succession along the Hailuogou Glacier retreat area. The concentrations and spectral characteristics of DOM were analyzed via a combination of elemental analysis, ultraviolet-visible spectroscopy, and three-dimensional fluorescence excitation-emission matrix spectroscopy. The results showed that concentrations of soil dissolved organic carbon and dissolved organic nitrogen of both topsoil and subsoil increased significantly during vegetation succession. Along the chronosequence, the protein-like components and optical indices were significantly enhanced, humic-like components and the optical indices decreased, the aromaticity degree of DOM increased first and then decreased. Soil pH and NH4+-N content explained 62.2% of the total variation of surface soil DOM components, while soil moisture and pH explained 64.3% of that of subsurface soil DOM, indicating that environmental conditions were key factors affecting the concentrations and composition of soil DOM in the Hailuogou Glacier retreat area.

Key words: soil dissolved organic matter, primary succession, three-dimensional fluorescence excitation emission matrix spectra, ultraviolet-visible absorption spectra, glacial retreat