深圳湾及邻近水域中的溶解有机氮.pdf

中国环境科学 2016,36(9) ：2757~2764 China Environmental Science 深圳湾及邻近水域中的溶解有机氮 ——其时空分布、来源和生物利用率 * 李绪录 ,许春玲,林 梵,史华明,张军晓 ( 国家海洋局南海调查技术中心,广东 广州 510300) 摘要：依据 2000~2014 年每月的监测资料,分析了深圳湾及邻近沿岸水域中溶解有机氮(DON)质量浓度的时空分布,并结合盐度、5d 生物 需氧量和颗粒有机物实测数据探讨 DON 的来源和生物利用率.结果表明,深圳湾中 DON 质量浓度为(0.45±0.45)mg/L,夏、冬季较高,春、秋 季较低,在 2000~2004 年呈上升趋势,而在 2005~2014 年呈下降趋势;珠江口东南沿岸中 DON 质量浓度为(0.16±0.08)mg/L,季节变化小,研究 期间总体上略呈上升趋势.深圳湾和珠江口东南沿岸中 DON 均呈现出保守并具有同源性.依二元混合质量平衡模式估算的深圳湾中 DON 陆源质量分数约为 80%,而珠江口东南沿岸中约为 38%,显示深圳湾 DON 主要来自陆源,而珠江口东南沿岸主要来自海源.依实测数据和回 归分析结果估算的深圳湾中平均 DON 生物利用率为 14.8%,而珠江口东南沿岸中为 15.5%,与珠江口下段高盐区中实测溶解有机碳生物利 用率相近. 关键词：DON ；时空分布；来源；生物利用率；沿岸水；深圳湾；珠江口 中图分类号：X142 文献标识码：A 文章编号：1000-6923(2016)09-2757-08 Dissolved organic nitrogen in the Shenzhen Bay and adjacent coastal waters: Its temporal and spatial distributions, * sources and bioavailability. LI Xu-lu , XU Chun-ling, LIN Fan, SHI Hua-ming, ZHANG Jun-xiao (South China Sea Marine Survey and Technology Center, State Oceanic Administration, Guangzhou 510300, China). China Environmental Science, 2016,36(9)：2757~2764 Abstract ：Based on the data obtained monthly from 2000 to 2014, temporal and spatial distributions of dissolved organic nitrogen (DON) concentration in the Shenzhen Bay and coastal southeastern Pearl River Estuary were analyzed. Also sources and bioavailability of the DON were investigated in combination with the salinity, 5-d biochemical oxygen demand and particulate organic matter measurements. The results showed that the DON concentration was 0.45±0.45mg/L with an increase trend from 2000 to 2004 and a decrease one from 2005 to 2014 and higher in summer and winter than spring and autumn in the bay, and 0.16±0.08mg/L with small seasonal changes and an increase trend in the whole period studied in the