珠江口及毗邻海域水体悬浮颗粒有机质来源及影响因素  

The sources and influencing factors of suspended organic matter in the Pearl River Estuary and its adjacent waters

作　　者：赵春宇 王岩[1,2] 谭烨辉 马雯雯[1] ZHAO Chunyu;WANG Yan;TAN Yehui;MA Wenwen(College of Ecology,Resources and Environment,Dezhou University,Dezhou 253023,Shandong,China;Key Laboratory of Tropical Marine Bio-re-sources and Ecology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China)

机构地区：[1]德州学院生态与资源环境学院,山东德州253023 [2]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,广州510301

出　　处：《生态学杂志》2025年第2期512-520,共9页Chinese Journal of Ecology

基　　金：山东省自然科学基金项目(ZR2020QC052);国家重点基础研究发展计划(973)项目(2015CB452905);德州学院博士启动基金(2019xjrc338)资助。

摘　　要：为探究珠江口及毗邻海域有机质来源、时空分布及其影响因素,于2015年6月(夏季)和12月(冬季)对珠江口及毗邻海域水体中的悬浮颗粒有机物(SPOM)进行了采集,并测定了SPOM的碳氮稳定同位素值(δ^(13)C和δ^(15)N)。结果发现,珠江三角洲区域SPOM的分布具有明显的季节差异(P<0.01),且珠江冲淡水和外海水的耦合影响对SPOM的时空分布具有重要的控制作用。在夏季,珠江口及毗邻海域主要受珠江冲淡水、咸淡混合水和外海水的综合影响,其内部海域SPOM呈现高有机碳含量、低δ^(13)C值和高δ^(15)N值的特点,表明有机质主要受珠江径流携带的陆源物质、淡水藻类及人为排放等过程的影响。而在冬季,该区域主要由珠江冲淡水和咸淡混合水两种水团的影响,且SPOM的δ^(13)C和δ^(15)N分布与温盐分布特征相一致,呈现高δ^(15)N、低δ^(13)C的特征,表明珠江径流携带的淡水藻类可能是该地区有机质的重要来源。整体上,海洋自生浮游植物对有机质的贡献由珠江口内部朝向外海一侧呈逐渐增加的趋势。To explore the source and spatiotemporal distribution of organic matter and its influencing factors in the Pearl River Estuary and adjacent sea areas,we collected suspended particulate organic matters(SPOM)in June(summer)and December(winter)in 2015,and analyzedδ^(13)C andδ^(15)N of SPOM.The results showed that the distributions of SPOM in the Pearl River Delta region had obvious seasonal differences(P<0.01).The coupling effect of the Pearl River diluted water and outer seawater played an important role in controlling the temporal and spatial distribution of SPOM.In summer,the Pearl River Estuary and its adjacent waters were mainly affected by the Pearl River diluted water,brachish mixed water,and outer seawater.The SPOM of the inner sea area was char⁃acterized by higher organic matter content,lowerδ^(13)C value and higherδ^(15)N value,indicating that organic matter was mainly affected by the terrigenous matter carried by the Pearl River runoff,freshwater algae and anthropogenic discharge.In winter,theδ^(13)C andδ^(15)N distributions of SPOM were consistent with the thermohaline distribution,showing higherδ^(15)N and lowerδ^(13)C,indicating that the freshwater algae carried by the Pearl River runoff may be the important source of organic matter in this region.On the whole,the contribution of phytoplankton to organic matter increased gradually from the inner part of the Pearl River estuary to the outer part of the sea.

关 键 词：悬浮颗粒物 稳定同位素 有机质来源 珠江口 

分 类 号：X55[环境科学与工程—环境工程]