| 引用本文: | 郑达燕,刘睿,张柳柳,郑财贵,张静.三峡库区土地利用对河流溶解性有机质的多时空尺度影响.湖泊科学,2023,35(4):1343-1358. DOI:10.18307/2023.0426 |
| Zheng Dayan,Liu Rui,Zhang Liuliu,Zheng Caigui,Zhang Jing.Effects of land use on multi-temporal scales of dissolved organic matter in Three Gorges Reservoir. J. Lake Sci.2023,35(4):1343-1358. DOI:10.18307/2023.0426 |
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| 三峡库区土地利用对河流溶解性有机质的多时空尺度影响 |
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郑达燕1,2, 刘睿1,2, 张柳柳1,2, 郑财贵3,4, 张静1,2,3
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1.重庆师范大学地理与旅游学院, 重庆 401331;2.重庆师范大学 GIS应用研究重庆市重点实验室, 重庆 401331;3.重庆市规划和自然资源调查监测院, 重庆 401120;4.自然资源部国土空间规划监测评估预警重点实验室, 重庆 401120
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| 摘要: |
| 三峡库区拥有目前世界上规模最大的水利枢纽工程,自投入使用以来,为长江流域提供了丰富的水源及电力,促进了经济的发展,但同时也对该区域的生态环境造成了严重的冲击。澎溪河流域作为三峡库区长江流域干流的典型回水区和消落带,是众多学者研究三峡库区生态环境变化的重点区域。为探究不同时空尺度下土地利用对河流溶解性有机质(DOM)的影响,以澎溪河流域为研究对象,基于紫外-可见光谱分析和三维荧光光谱矩阵-平行因子分析,结合河段缓冲区、河岸带缓冲区及子流域3种空间尺度的二级土地利用类型,解析了旱雨季水体DOM的组成及来源特征,并采用相关分析和冗余分析方法探讨了3种空间尺度下土地利用方式对旱雨季水体DOM的多时空尺度影响。结果表明:(1)旱季水体DOM荧光组分以陆源类腐殖质所占比例更大,雨季水体DOM荧光组分以富里酸贡献为主。(2)流域内陆源输入和内源产生对水体DOM丰度均有贡献,雨季较旱季水体DOM的陆源性更强,自生源特征较弱。(3)土地利用在雨季和子流域尺度下对水体DOM的影响更显著,其中,雨季子流域尺度下,土地利用指数对水体DOM参数的解释率为90.35%。(4)不同土地利用方式对水体DOM产生的影响不同,灌木林、滩地和香农多样性指数对水体DOM的解释率最大。旱季,高覆盖度草地、边界密度与溶解性有机碳等水体DOM参数呈正相关关系,雨季则相反。河岸带缓冲区和子流域尺度下,灌木林、有林地、河渠和滩地与其呈负相关关系,水库坑塘、斑块密度与其呈正相关关系,河段缓冲区则相反。该研究可为合理的土地规划提供基础数据,以期为三峡库区河流生态系统和水资源管理提供参考。 |
| 关键词: 溶解性有机质 土地利用 冗余分析 三峡库区 澎溪河流域 |
| DOI：10.18307/2023.0426 |
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| 基金项目:重庆市自然科学基金面上项目(cstc2020jcyj-msxmX0549)、重庆市教委科学技术研究计划项目 (KJQN202200517)和重庆师范大学基金项目(20XLB022)联合资助。 |
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| Effects of land use on multi-temporal scales of dissolved organic matter in Three Gorges Reservoir |
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Zheng Dayan1,2, Liu Rui1,2, Zhang Liuliu1,2, Zheng Caigui3,4, Zhang Jing1,2,3
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1.School of Geography and Tourism, Chongqing Normal University, Chongqing 401331, P. R. China;2.The Key Laboratory of GIS Application Research, Chongqing Normal University, Chongqing 401331, P. R. China;3.Chongqing Institute of Surveying and Monitoring for Planning and Natural Resources, Chongqing 401120, P. R. China;4.Key Laboratory of Monitoring, Evaluation and Early Warning of Territorial Spatial Planning Implementation, Ministry of Natural Resources, Chongqing 401120, P. R. China
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| Abstract: |
| The Three Gorges Reservoir area has the largest water conservancy project in the world. In this context, it potentially provides water resources and promotes economic development, and yet causes serious impacts on ecological environments in the same time. In order to explore the effects of land use on riverine dissolved organic matter (DOM) at distinct spatial and temporal scales, we investigated a typical backwater area and water level fluctuation zone (Pengxi River basin) in the Three Gorges Reservoir area. Techniques of UV-Vis spectral analysis and 3D fluorescence spectral matrix-parallel factor analysis were used to analyze temporal variations of DOM composition and source characteristics. Landscape patterns reach buffer, riparian buffer and catchment were jointly employed to examine the influences of land use on surface water DOM at distinct spatial scales. The results showed that high protein-like abundance was observed in the dry seasons, whereas fulvic acids were dominated in the wet seasons. Both terrestrial and autochthonous inputs constrained DOM sources in the river basin, while terrestrial signals were particularly pronounced in the wet seasons in comparison to the dry seasons. Land use exhibited significant effects on riverine DOM in the wet seasons: land use indexes explained 90.35% of DOM parameters under the catchment scale. Specifically, shrublands, mudflats and Shannon's Diversity Index (SHDI) largely deciphered DOM variables. High cover grassland, edge density (ED) and dissolved organic carbon (DOC) were positively and negatively correlated with aquatic DOM in the dry and wet seasons, respectively. We found discrepant correlations among shrubland, forested land, rivers and canals, reservoir ponds, mudflats, patch density (PD) and DOM, spatially. At the riparian buffer and catchment scales, shrublands, forested lands, river channels and mudflats were negatively correlated with DOM, whereas reservoir ponds and PD were positively correlated with DOM. Our study may provide basic data for rational land planning, as well as assist understandings for river ecosystem and water resources management in the Three Gorges Reservoir area. |
| Key words: Dissolved organic matter land use redundancy analysis Three Gorges Reservoir area Pengxi River basin |
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