Distribution Characteristics of Organic Carbon Concentrations in Upper Layer of Canyon-type Reservoirs in Karst Areas During Dry Season
To reveal the carbon cycle patterns of canyon-type reservoirs in karst areas,this study took Wanfeng and Dongqing Reservoirs as the study areas.The variation characteristics and distribution patterns of physico-chemical indicators and organic carbon concentrations during the dry season were analyzed by field monito-ring and water sample collection.The results showed that the Water Temperature(WT),Conductivity(COND),Total Dissolved Solids(TDS),Oxidation-Reduction Potential(ORP),Total Nitrogen(TN)and Total Phosphorus(TP)in Wanfeng Reservoir were higher than those in Dongqing Reservoir and had large variation ranges.The spatial variations of WT,COND,TDS and TP in Wanfeng and Dongqing Reservoirs were small.The coefficients of variation of ORP and TN were large and had high spatial variability.The con-centrations of Total Organic Carbon(TOC)and Dissolved Organic Carbon(DOC)in Wanfeng Reservoir ranged from 3.11 mg/L to 6.66 mg/L and 2.35 mg/L to 5.12 mg/L,respectively,being higher in the main stream than in the tributary Maling River.The TOC and DOC concentrations in Dongqing Reservoir ranged from 3.07 mg/L to 4.75 mg/L and 2.87 mg/L to 3.99 mg/L,respectively,showing the distribution pattern of reservoir bay(D1)＞quay(D4)＞pre-dam(D2).The TOC and DOC concentrations in Wanfeng Reservoir were both higher than those in Dongqing Reservoir and had large variation ranges.The organic carbon in both Wanfeng and Dongqing Reservoirs were dominated by DOC.The concentrations of Particulate Organic Car-bon(POC)in the two reservoirs were low but higher than those in other reservoirs.The findings provide da-ta support and reference for studying the carbon cycle in water ecosystems in karst areas.
total organic carbondissolved organic carboncanyon-type reservoirskarst areas
万方数据
维普
