中文关键词岩溶水水生光合作用有色溶解有机质(CDOM)溶解有机碳(DOC)微生物降解 英文关键词karst underground river wateraquatic photosynthesischromophoric dissolved organic matter(CDOM)dissolved organic carbon (DOC)microbial degradation

作者	单位	E-mail
范佳鑫	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715	fanfanfanjiaxin@hotmail.com
蒋勇军	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715	jiangjyj@swu.edu.cn
贺秋芳	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
王家楠	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
何瑞亮	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
张彩云	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
马丽娜	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715
汪啟容	西南大学地理科学学院, 岩溶环境重庆市重点实验室, 重庆 400715

中文摘要 溶解有机质（DOM）作为岩溶水体碳汇的重要组成部分，其来源、分布和迁移变化对研究岩溶碳汇的组成、结构和通量具有重要意义，其组成和结构特征常用有色溶解有机质（CDOM）反演.本研究于旱季每月采集重庆雪玉洞洞内地下水和洞外地表水，通过地下河从洞内向洞外的流动过程中水化学和CDOM光谱特性的变化，分析CDOM的变化影响因素，为研究岩溶水体DOM碳汇通量提供理论基础.结果表明：①雪玉洞岩溶水中CDOM以小分子易降解的内源有机质为主，类色氨酸和类酪氨酸组分占60%以上；②雪玉洞地下水中的CDOM主要受地下水微生物的降解作用影响，地下水流动过程中有少量易降解有机质被微生物降解，TOC和DOC含量略有降低，CDOM腐殖化程度略有增强；③雪玉洞地表水CDOM主要受水池中水生植物光合作用控制，水生植物生长处TOC和DOC含量明显升高，CDOM内源特征和小分子组分明显增多. 英文摘要 Dissolved organic matter (DOM) in karst water is one of the most important carbon sink components, whose origins, distributions, and transport processes are of significance to carbon sink studies. Chromophoric dissolved organic matter (CDOM) can be utilized to express the composition and structural properties of DOM. In this paper, water samples were collected monthly from Xueyu Cave in a karst underground river from both inside and outside the cave. The changes in hydrochemistry and CDOM spectral characteristics as well as the influencing factors for CDOM changes were studied, with the aim of providing experimental support for carbon sink fluxes in karst processes. The main results were as follows. ① The dominant type of CDOM in Xueyu Cave karst water consisted of small molecular weight organic matter that was autochthonously derived and easily bio-degraded, and the tryptophan-like and tyrosine-like components accounted for more than 60% of the total CDOM. ② The most effective influencing factor inside the cave was microbes, which degraded the small molecular DOM in groundwater and induced slight decreases in the TOC and DOC concentrations; they also increased the humic index (HIX). ③ However, the dominant factor outside the cave was submerged aquatic plant photosynthesis, which induced significant increases in the TOC and DOC concentrations and autochthonous small molecular weight DOM contents.

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