| 环青海湖地下水溶解性碳的时空变化特征 |
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| 引用本文： | 李东昇,崔步礼,赵云朵.环青海湖地下水溶解性碳的时空变化特征[J].地理研究,2022,41(10):2821-2831. |
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| 作者姓名： | 李东昇 崔步礼 赵云朵 |
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| 作者单位： | 1.同济大学海洋与地球科学学院,上海 2000922.鲁东大学资源与环境工程学院,烟台 2640253.北京师范大学地理科学学部自然资源学院,北京 100875 |
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| 基金项目： | 国家自然科学基金项目(41730854);国家自然科学基金项目(41877157);国家自然科学基金项目(42177236) |
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| 摘 要： | 区域地下水溶解性碳的时空变化特征研究对于认识区域物质循环和能量传递及推动区域生态可持续发展具有重要意义。本研究在青海湖流域冻结期和融化期分别收集了地下水、河水和湖水样品,研究了环青海湖地下水在冻结期和融化期的溶解性碳特征,并探究了不同类型地下水的溶解性碳特征及其对不同冻融时期的响应,最后揭示了环湖区域不同水体的溶解性碳的差异特征及影响因素。结果表明：冻结期地下水、河水和湖水的溶解性无机碳（DIC）均相对高于融化期,溶解性有机碳（DOC）均相对低于融化期。地下水、河水和湖水的溶解性碳均主要以DIC为主,DIC在溶解性碳的占比高达92%。地下水的DIC平均含量在基岩裂隙水、水量中等和浅埋藏的水文地质条件下相对较高,DOC平均含量在基岩裂隙水、水量丰富和浅埋藏的水文地质条件下相对较高。地下水的DIC在湖滨平原砂砾石层、淤泥质砂层潜水和水量中等的水文地质条件下受冻融期影响较大,DOC在基岩裂隙水和水量贫乏的水文地质条件下受冻融期影响较大。湖水的DIC和DOC均远高于河水和地下水。河水的DIC在融化期和冻结期均低于地下水,DOC在融化期高于地下水,在冻结期低于地下水。
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| 关 键 词： | 溶解性无机碳 溶解性有机碳 时空变化特征 地表水和地下水 青海湖流域 |
| 收稿时间： | 2021-11-15 |
The spatio-temporal variation of dissolved carbon in groundwater around the Qinghai Lake |
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| LI Dongsheng,CUI Buli,ZHAO Yunduo.The spatio-temporal variation of dissolved carbon in groundwater around the Qinghai Lake[J].Geographical Research,2022,41(10):2821-2831. |
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| Authors: | LI Dongsheng CUI Buli ZHAO Yunduo |
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| Institution: | 1. School of Ocean and Earth Science, Tongji University, Shanghai 200092, China2. School of Resources and Environmental Engineering, Ludong University, Yantai 264025, China3. School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China |
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| Abstract: | The study of spatio-temporal variation of dissolved carbon in regional groundwater is of great significance for understanding regional material cycle and energy transfer and promoting regional ecological sustainable development. In this study, groundwater, river water and lake water samples were collected to examine the characteristics of dissolved carbon in groundwater around the Qinghai Lake during the freezing and thawing periods, investigate the characteristics of dissolved carbon in different types of groundwater and its responses to the freezing and thawing periods, and reveal the difference characteristics and influencing factors of dissolved carbon in different water bodies around the lake. The results showed that the dissolved inorganic carbon (DIC) of groundwater, river water and lake water in freezing period was higher than that in thawing period, while the dissolved organic carbon (DOC) of groundwater, river water and lake water in freezing period was lower than that in thawing period. DIC was the main dissolved carbon in groundwater, river water and lake water, which accounted for 92% of dissolved carbon. The mean content of DIC in groundwater was relatively high under the hydrogeological conditions of bedrock fissure water, moderate water volume and shallow burial water, while the mean content of DOC was relatively high under the hydrogeological conditions of bedrock fissure water, abundant water volume and shallow buried water. DIC in groundwater was greatly affected by freeze and thaw process under the hydrogeological conditions of gravel bed in lakeside plain, diving in muddy sand and moderate water volume, while DOC was greatly affected by freeze and thaw process under the hydrogeological conditions of bedrock fissure water and poor water volume. DIC and DOC in lake water were much higher than those in river water and groundwater. DIC in river water was lower than that in groundwater in both the thawing and freezing periods, while DOC in river water was higher than that in groundwater in the thawing period and lower than that in groundwater in the freezing period. |
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| Keywords: | dissolved inorganic carbon dissolved organic carbon spatio-temporal variation characteristics surface water and groundwater Qinghai Lake Basin |
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