| 王育来,孙即梁,杨长明,崔恒钊,李建华.河岸带土壤溶解性有机质垂直分布特征及其性质研究[J].农业环境科学学报,2013,32(12):2413-2421. |
| 河岸带土壤溶解性有机质垂直分布特征及其性质研究 |
| Distribution of Dissolved Organic Matter and Its Properties in Soils Across Different Riparian Zones |
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| DOI：10.11654/jaes.2013.12.014 |
| 中文关键词: 崇明岛 河岸带 溶解性有机质 三维荧光光谱 荧光指数 |
| 英文关键词: Chongming Island riparian zone dissolved organic matter（DOM） excitation-emission matrix（EEM） fluorescence index（FI） |
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| 中文摘要: |
| 河岸带有机质（Soil organic matter, SOM）的迁移转化在有机碳从陆地生态系统向水域生态系统中迁移转化及污染物的迁移转化中起到了重要的作用。以崇明岛典型河岸带为研究对象，分析了不同区域河岸带土壤有机碳（Soil organic carbon, SOC）、土壤溶解性有机碳（Soil dissolved organic carbon, SDOC）垂直分布特征和三维荧光光谱（Excitation-Emission matrix, EEM）特征，探讨了河岸带对土壤溶解性有机质（Soil dissolved organic matter, SDOM）性质及其潜在环境影响。结果表明：表层土壤（0~30 cm）SOC储量占采样深度土壤SOC 的40%左右，SDOC占SOC的5%左右，从陆上区域到缓冲区域表层土壤SDOC呈累积效应。河岸带有机质主要来自河岸带植物残体及其代谢产物，地下水也可能是河岸带土壤DOM的另一来源，河岸带土壤中大部分类腐殖质被表层矿物质所吸附。在土壤系统中，综合应用荧光指纹指数[荧光指数（Fluorescence index，FI），生源指数（The index of recent autochthonous contribution，BIX）和腐殖化指数（Humification index，HIX）]可以有效地揭示其来源和特性，但在土壤体系中单独应用指纹指数需审慎。 |
| 英文摘要: |
| Soil dissolved organic matter（SDOM） plays important roles in carbon cycling and transports of organic and inorganic contaminants in a riparian buffer zone. Here we measured soil organic carbon（SOC） and soil dissolved organic carbon（SDOC） contents, excitation-emission matrix（EEM） fluorescence spectrum of SDOM and optical indices in the samples collected across the typical riparian zones in Chongming Island, China. Soil organic carbon in the surface layer（0~30 cm） accounted for 40% of that in the whole soil profile（0~80 cm）, and SDOC was 5% of SOC and increased from the upland to the buffer zone. SDOM contains humic-like and protein-like substances, mainly derived from recently dead plant debris. Ground water might also contribute to the SDOM in the riparian zone. Most of humic-like substances were adsorbed on soil minerals. |
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