【摘 要】
：
活性有机碳是海洋沉积物有机碳的重要组成部分,研究河口区沉积物不同浸提组分的活性有机碳对于认知近海活性有机碳的迁移转化过程具有重要意义,可为全球碳循环研究提供基础.
【机 构】
：
中国科学院南海海洋研究所热带海洋生物资源与生态重点实验室,广东广州510301;国家海洋局南海环境监测中心,广东广州510300;中国科学院大学,北京100049;中国科学院南海海洋研究所热带海洋生物
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活性有机碳是海洋沉积物有机碳的重要组成部分,研究河口区沉积物不同浸提组分的活性有机碳对于认知近海活性有机碳的迁移转化过程具有重要意义,可为全球碳循环研究提供基础.本文于2013年7月采集珠江口表层沉积物样品,通过盐提取(SEC)、水提取(WEC)、氯仿熏蒸提取(MBC)和酸提取(AHC)等方法测定其活性有机碳,研究其分布规律及相互关系.结果 表明:(1)珠江口表层沉积物SEC、WEC、MBC和AHC的平均含量分别为(768.0±23.5)×10-6、(688.1±31.2)×10-6、(963.2±26.4)×10-6和(3040.7±18.2)×10-6;(2)沉积物SEC和AHC含量由西北部向东南部逐渐减少,而MBC含量由口外向西北口内逐渐减少,WEC空间分布则相对均匀;(3)陆源输入的较难降解的活性有机碳主要在西部区域沉积,而微生物活性有机碳量则主要在东南部口外处沉积.总体来看,受人类活动的影响,珠江口沉积物中的活性有机碳含量相对较高,不利于其有机碳的埋藏.
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