Characteristics and Influencing Factors of Dissolved Organic Matter in Cave Drip Water-A Case Study from Furong Cave, Southwest China

被引:1
作者
He, Yating [1 ]
Li, Junyun [2 ]
Li, Xiuli [3 ]
Liao, Jin [4 ]
Liang, Qisheng [1 ]
Li, Huayan [2 ]
Duan, Rong [1 ]
Wang, Chenyi [1 ]
Liu, Bao [1 ]
Xue, Yanxia [1 ]
Li, Tingyong [1 ]
机构
[1] Yunnan Normal Univ, Fac Geog, Yunnan Key Lab Plateau Geog Proc & Environm Charge, Kunming 650500, Yunnan, Peoples R China
[2] Southwest Univ, Sch Geog Sci, Chongqing Key Lab Karst Environm, Chongqing 400715, Peoples R China
[3] China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Peoples R China
[4] Wuhan Ctr China Geol Survey, Environm Dept, Wuhan 430205, Peoples R China
基金
中国国家自然科学基金;
关键词
epikarst zone; cave monitoring; drip water; dissolved organic matter; FLUORESCENCE SPECTROSCOPY; TEMPORAL VARIABILITY; REGIONAL-INTEGRATION; UNSATURATED ZONE; HESHANG CAVE; FATTY-ACIDS; CARBON; TEMPERATURE; SOIL; INFILTRATION;
D O I
10.3390/w16020207
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Understanding the hydrological processes of dissolved organic matter (DOM) in the surface karst zone is crucial for the utilization and safety of groundwater resources. However, research on DOM in drip water from karst caves is limited. In this study, continuous monitoring was conducted for four years at four drip water monitoring sites (MP1, MP2, MP3, and MP9) in Furong Cave, Southwest China. The three-dimensional fluorescence excitation-emission spectroscopy (3D-EEM) and fluorescence region integration (FRI) methods were employed, along with correlation analysis, to investigate the spectral characteristics, composition, sources, and influencing factors of the DOM in the drip water of Furong Cave. The results indicated that (1) the three-dimensional fluorescence peaks in the drip water were classified into six categories: A, B, C, T, Ti, and M. (2) The dominant source of the drip water DOM is endogenous organic matter. (3) The FRI analysis indicates a relatively high proportion of Type II substances in the drip water, predominantly composed of tryptophan-like substances. (4) The DOM in the drip water of Furong Cave was influenced by various factors, including the mixing effect of "new" and "old" water, water residence time in karst systems, and water-rock interactions (WRI), resulting in the complex responses of drip rates and DOM to surface precipitation and temperature at different drip water sites. This study provides a reference for comparative research on DOM in cave drip water in karst regions, which contributes to a better understanding of the migration mechanism of DOM in karst aquifers under different climate and karst ecological conditions.
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页数:22
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