人类活动对漓江地表水体水-岩作用的影响
发布时间：2018-08-26 13:15
【摘要】：人类活动对流域水质的影响受到越来越多的关注.为探讨人类活动对岩溶地表水体水-岩作用的影响,以受农业、工业、旅游业活动及城市发展综合影响的漓江流域为研究对象,于2016年7~11月采集河水样,分析水化学和δ~(13)C_(DIC)数据.结果表明:(1)漓江水化学类型为HCO_3-Ca.在阴离子成分中,SO_4~2和NO_3~-仅次于HCO_3~-,并且在漓江桂林至阳朔段,因城市及城镇分布密集,旅游业发达,浓度较高.(2)[Ca~(2+)+Mg~(2+)]/[HCO_3~-]当量比值在1.01~1.51之间,[Ca~(2+)+Mg~(2+)]/[SO_4~(2-)+NO_3~-+HCO_3~-]比值在0.85~1.12之间,说明硫酸、硝酸参与了水-岩作用.(3)碳酸溶蚀碳酸盐岩的比例平均为75.89%.硫酸和硝酸溶蚀碳酸盐岩的比例平均为24.11%.硝酸、硫酸溶蚀碳酸盐岩的能力多雨期强于少雨期.此外,硫酸和硝酸溶蚀碳酸盐岩的比例从上游到下游呈波动增大趋势,最高值出现于灵川县城,最低出现于漓江上游的华江.(4)碳酸风化碳酸盐岩对HCO_3~-的贡献最大,平均为83.58%;其次为硫酸和硝酸风化碳酸盐岩,平均为14.24%;碳酸风化硅酸盐岩对HCO_3~-的贡献最小,平均为2.18%,华江和峡背碳酸风化硅酸盐岩对HCO_3~-的贡献较其他点突出,这与流域地质背景相符合.(5)δ~(13)C_(DIC)值介于-11.95‰~-7.61‰之间;通过端元混合模型估算的δ~(13)C_(DIC-rock)介于-14.24‰~-7.23‰之间.多雨期δ~(13)C_(DIC)值与δ~(13)C_(DIC-rock)值比较接近,少雨期δ~(13)C_(DIC)值明显重于δ~(13)C_(DIC-rock).δ~(13)C_(DIC)与δ~(13)C_(DIC-rock)之间存在一定差异,是由于受到水生植物光合作用的影响.
[Abstract]:More and more attention has been paid to the impact of human activities on water quality in river basins. In order to study the influence of human activities on the water-rock interaction of karst surface water bodies, the Lijiang River basin, which is affected by agriculture, industry, tourism activity and urban development, was studied. The water samples were collected from July to November of 2016, and the hydrochemistry and 未 ~ (13) C _ (DIC) data were analyzed. The results show that: (1) the chemical type of Lijiang River is HCO_3-Ca.. In the anionic composition, NO_3~- and NO_3~- are only inferior to HCO_3~-, and in the section of Guilin to Yangshuo of the Lijiang River, due to the dense distribution of cities and towns, the tourism industry is developed and the concentration is high. (2) the equivalent ratio of [Ca~ (2) Mg~ (2) / [HCO_3~-] is between 1.01 and 1.51, and the ratio of [Ca~ (2) Mg~ (2)] / [SO_4~ (2-) NO_3~- HCO_3~-] is between 0.85 and 1.12, indicating that the ratio of sulfuric acid, [Ca~ (2) Mg~ (2)] / [SO_4~ (2-) NO_3~- HCO_3~-] is between 0.85 and 1.12. Nitric acid is involved in water-rock interaction. (3) the ratio of carbonate rock dissolved by carbonic acid is 75.89 on average. The ratio of sulphuric acid to nitric acid dissolved carbonate rock is 24.11 on average. The ability of nitric acid and sulphuric acid to dissolve carbonate rock is stronger in rainy period than in less rain period. In addition, the ratio of sulphuric acid and nitric acid dissolved carbonate rock fluctuates and increases from upstream to downstream, with the highest value in Lingchuan county and the lowest in Huajiang River in the upper reaches of Lijiang River. (4) Carbonate weathered carbonate rocks contribute the most to HCO_3~-. The average value was 83.58; the second was weathered carbonate rock with sulphuric acid and nitric acid, with an average of 14.240.The contribution of weathered carbonate to HCO_3~- was the least, with an average of 2.18. The contribution of weathered carbonate silicate from Huajiang and isthmus to HCO_3~- was more prominent than that of other points. The values of 未 ~ (13) C _ (DIC) are between -11.95 鈥，
本文编号：2204972
[Abstract]:More and more attention has been paid to the impact of human activities on water quality in river basins. In order to study the influence of human activities on the water-rock interaction of karst surface water bodies, the Lijiang River basin, which is affected by agriculture, industry, tourism activity and urban development, was studied. The water samples were collected from July to November of 2016, and the hydrochemistry and 未 ~ (13) C _ (DIC) data were analyzed. The results show that: (1) the chemical type of Lijiang River is HCO_3-Ca.. In the anionic composition, NO_3~- and NO_3~- are only inferior to HCO_3~-, and in the section of Guilin to Yangshuo of the Lijiang River, due to the dense distribution of cities and towns, the tourism industry is developed and the concentration is high. (2) the equivalent ratio of [Ca~ (2) Mg~ (2) / [HCO_3~-] is between 1.01 and 1.51, and the ratio of [Ca~ (2) Mg~ (2)] / [SO_4~ (2-) NO_3~- HCO_3~-] is between 0.85 and 1.12, indicating that the ratio of sulfuric acid, [Ca~ (2) Mg~ (2)] / [SO_4~ (2-) NO_3~- HCO_3~-] is between 0.85 and 1.12. Nitric acid is involved in water-rock interaction. (3) the ratio of carbonate rock dissolved by carbonic acid is 75.89 on average. The ratio of sulphuric acid to nitric acid dissolved carbonate rock is 24.11 on average. The ability of nitric acid and sulphuric acid to dissolve carbonate rock is stronger in rainy period than in less rain period. In addition, the ratio of sulphuric acid and nitric acid dissolved carbonate rock fluctuates and increases from upstream to downstream, with the highest value in Lingchuan county and the lowest in Huajiang River in the upper reaches of Lijiang River. (4) Carbonate weathered carbonate rocks contribute the most to HCO_3~-. The average value was 83.58; the second was weathered carbonate rock with sulphuric acid and nitric acid, with an average of 14.240.The contribution of weathered carbonate to HCO_3~- was the least, with an average of 2.18. The contribution of weathered carbonate silicate from Huajiang and isthmus to HCO_3~- was more prominent than that of other points. The values of 未 ~ (13) C _ (DIC) are between -11.95 鈥，
本文编号：2204972
本文链接：https://www.wllwen.com/shengtaihuanjingbaohulunwen/2204972.html
