| 消落带夏冬季土壤溶解有机质的组成特征及来源 |
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| 引用本文： | 郝蓉,徐召玉,沈祠福,伍玉鹏,宋艳暾,张金良.消落带夏冬季土壤溶解有机质的组成特征及来源[J].生态环境学报,2019(6):1127-1133. |
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| 作者姓名： | 郝蓉 徐召玉 沈祠福 伍玉鹏 宋艳暾 张金良 |
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| 作者单位： | 农业部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室;华中农业大学资源与环境学院/农业部长江中下游耕地保育重点实验室;天津市农业科学院 |
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| 基金项目： | 农业部产地环境污染防控重点实验室/天津市农业环境与农产品安全重点实验室开放基金项目;国家自然科学基金项目(41877528) |
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| 摘 要： | 溶解性有机质(Dissolved organic matter,DOM)普遍存在于土壤、沉积物和水体中,在环境地球化学和全球碳循环中发挥重要作用。消落带独特的"干湿交替"使土壤有不同的季节特征,但有关不同季节土壤DOM的性质、组成及来源差异还未见报道。利用紫外-可见光谱、三维荧光光谱(Excitation-emission matrices,EEMs)与平行因子分析模型(Parallel factor analysis,PARAFAC)相结合的方法,分析了丹江口库区消落带表层土壤DOM在不同季节的组成、结构,并对其来源进行解析。结果表明,不同季节消落带土壤DOM的组成特征存在一定差异。冬季土壤的有色溶解性有机物(Chromophoric dissolved organic matter,CDOM)浓度、土壤DOM的芳香性、缩合度、腐殖化程度、所含疏水性组分都高于夏季土壤,但参与光漂白的活性要低于夏季土壤。荧光指数(FI)、腐殖化指数(HIX)和生物源指数(BIX)表明该区土壤DOM的来源在不同季节都有明显的自生源特征,且腐殖化程度和生物可利用性都不高,并未表现显著差异。该区土壤DOM存在两个主要的荧光峰:紫外光区类富里酸峰、可见光区类富里酸峰和类腐殖酸峰。研究提出消落带淹水期间产生的DOM对水环境有很大影响,以内源为主的库区在水质改善的过程中需加强对内源物质的管控。这些研究结果可为消落带的水体修复和污染物的迁移转化提供科学依据。
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| 关 键 词： | 土壤溶解性有机质 季节变化 消落带 紫外-可见光谱 荧光光谱 |
Chemical Characteristics and Sources of Dissolved Organic Matter in Soils of Water-Level Fluctuation Zones in Summer and Winter |
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| HAO Rong,XU Zhaoyu,SHEN Cifu,WU Yupeng,SONG Yantun,ZHANG Jinliang.Chemical Characteristics and Sources of Dissolved Organic Matter in Soils of Water-Level Fluctuation Zones in Summer and Winter[J].Ecology and Environment,2019(6):1127-1133. |
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| Authors: | HAO Rong XU Zhaoyu SHEN Cifu WU Yupeng SONG Yantun ZHANG Jinliang |
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| Institution: | (Key Laboratory of Original Agro-environmental Pollution Prevention and Control, Ministry of Agriculture/ Tianjin Key Laboratory of Agro-environment and Safe-product, Tianjin 300191, China;Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture/College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;Tianjin Academy of Agricultural Sciences, Tianjin 300191, China) |
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| Abstract: | HAO Rong;XU Zhaoyu;SHEN Cifu;WU Yupeng;SONG Yantun;ZHANG Jinliang(Key Laboratory of Original Agro-environmental Pollution Prevention and Control, Ministry of Agriculture/ Tianjin Key Laboratory of Agro-environment and Safe-product, Tianjin 300191, China;Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture/College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;Tianjin Academy of Agricultural Sciences, Tianjin 300191, China) |
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| Keywords: | dissolved organic matter in soil seasonal variation water-level fluctuation zones ultraviolet-visible spectra fluorescence excitation emission matrix |
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