摘要
文章基于逐步回归分析与随机森林算法,以三亚湾2008—2023年水体实测理化参数为输入数据,探究了三亚湾溶解有机碳(dissolved organic carbon,DOC)的时空分布特征、演变趋势及其影响主因。结果表明,DOC质量浓度受三亚海岸带开发影响,在2008—2018年期间显著上升,随后呈逐步下降趋势,可能源于疫情期间陆源输入减少以及政府加强海洋生态环境治理的综合影响;近岸海域出现DOC的高值区,但DOC质量浓度均值为(2.00±1.34)mg·L^(-1),相比于半封闭型海湾,整体维持在较低水平;逐步回归分析与随机森林算法结果显示:DOC质量浓度随温度、总碱度和活性硅酸盐浓度升高先增后减,且与总磷、溶解氧和活性磷酸盐呈显著负相关。这些结果表明,温度、总碱度、总磷、活性硅酸盐、溶解氧和活性磷酸盐是影响三亚湾DOC的主要因子。
To explore the spatiotemporal changes,trends,and environmental impact factors of dissolved organic carbon(DOC)in Sanya Bay,water physicochemical parameters collected from 2008 to 2023 in Sanya Bay were used as the input data for analysis based on stepwise regression analysis(SR)and random forest algorithm(RF).The results showed that the DOC concentration increased significantly from 2008 to 2018 due to coastal development in Sanya.A subsequent decline in DOC concentration might have resulted from the combined effects of reduced land-based inputs during the COVID-19 pandemic and the government’s efforts to strengthen the management of the marine environment.High-value zones of DOC were observed on the coastal areas of Sanya Bay.The mean value of DOC concentration was(2.00±1.34)mg·L^(-1),which maintained at a lower level compared to other semienclosed bays.Both SR and RF results indicated that DOC concentrations generally exhibited an initial increase followed by a decrease with rising temperature,total alkalinity,and silicate concentration,and showed significant negative correlations with totalphosphorus,dissolved oxygen,and phosphate.These findings demonstrate that temperature,total alkalinity,total phosphorus,silicate,dissolved oxygen,and phosphate are the main factors affecting DOC in Sanya Bay.
作者
周伟华
姚煜坤
罗勇
李涛
龙爱民
黄晖
ZHOU Weihua;YAO Yukun;LUO Yong;LI Tao;LONG Aimin;HUANG Hui(Laboratory of Tropical Marine Bio-resources and Ecology,Guangdong Provincial Key Laboratory of Applied Marine Biology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China;Key Laboratory of Tropical Marine Biotechnology of Hainan Province,Sanya Institute of Ocean Eco-Environmental Engineering,Sanya 572000,China;Sanya National Marine Ecosystem Research Station,Tropical Marine Biological Research Station in Hainan,Chinese Academy of Sciences,Sanya 572000,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《热带海洋学报》
2026年第2期106-116,共11页
Journal of Tropical Oceanography
基金
海南省自然科学基金项目(425QN506)。
关键词
溶解有机碳
时空分布
环境因子
三亚湾
dissolved organic carbon
spatiotemporal distribution
environmental factors
Sanya Bay
