| 摘要: |
| 选择流入渤海和北黄海的36条主要河流为研究对象, 对比了平水期、丰水期和枯水期水体中悬浮颗粒物和河流表层沉积物的碳和氮稳定同位素的地球化学特征, 并对颗粒物有机质碳和氮来源进行分析。结果表明, 水体悬浮有机质碳同位素总体上表现为δ13C平水期>δ13C丰水期>δ13C枯水期的特点, δ15N值呈δ15N丰水期>δ15N平水期>δ15N枯水期的特点。渤海和北黄海的主要入海河流悬浮颗粒物有机质的来源具有明显的季节性差异, 悬浮颗粒有机质碳平水期(春秋季)来源以C3植物、土壤有机质和水生藻类为主, 丰水期(夏季)碳的各来源中浮游植物的贡献率明显增大, 枯水期(冬季)则表现为陆源C3植物分解和水源性有机质的混合来源; 悬浮颗粒态氮的来源与季节性降水量、生活污水、合成化肥及河流内源性水生植物密切相关。 |
| 关键词: 悬浮颗粒物 碳稳定同位素 氮稳定同位素 季节性特征 源解析 |
| DOI：10.11759/hykx20160914003 |
| 分类号: |
| 基金项目:中国科学院重点部署项目(KZZD-EW-14); 中国科学院战略性先导专项(XDA11020305) |
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| Seasonal variations and sources of carbon and nitrogen isotopes in suspended particulate matter in inflow rivers of the Bohai Sea and the North Yellow Sea |
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YU Jing,ZHANG Hua1
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| Abstract: |
| Samples of total suspended particulate matter (TSM) from inflow rivers of the Bohai Sea and the North Yellow Sea over different seasons were collected and analyzed for concentrations of total organic carbon (POC), total nitrogen (PN), and stable isotopic composition (δ13C and δ15N). These isotopic compositions were used for identifying the sources of organic carbon and nitrogen in suspended particulate matter. The results showed that the seasonal variation of δ13C and δ15N in TSM were δ13Cmedium flow>δ13Chigh flow>δ13Clow flow and δ15Nhigh flow>δ15Nmedium flow> δ15Nlow flow, respectively. The sources of total suspended particulate organic matter suggested obvious seasonal variations in river inflows. The C3 plant, soil organic matter, and macrophyte were the main mixture sources of organic matter during medium flow (spring and autumn). The contribution of phytoplankton increased during high flow (summer). The suspended organic matter was derived mainly from mixture sources of C3 plant debris and autochthonous organic matter during low flow (winter); sources of suspended particulate nitrogen mainly included seasonal precipitation, municipal sewage, fertilizer, and autochthonous macrophyte. |
| Key words: suspended particulate matter stable organic carbon isotopic stable nitrogen isotopic seasonal variations sources |
