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基于南黄海西部沉积化学及相关环境因子的调查资料,重点分析和探讨了冷水团海域及近岸区表层沉积物中TOC、TN、TP的分布特征及其生态学指示意义.结果显示,冷水团海域沉积物比近岸区沉积物具有较高的含水率、TOC、TN、TP含量及N/P比.沉积物类型(粒径)、物质来源和沉积环境显著影响着TOC含量,TOC高值主要分布在泥质沉积区.表层沉积物TN与TOC含量在冷水团海域呈显著正相关关系,表明两者的同源性较好,但整个调查海域中TP与TOC、TN无显著相关性,说明其来源较复杂.南黄海冷水团海域和西部近岸浅水区沉积物理化特性之间的显著差异反映了它们受控因素的迥异,冷水团海域沉积物TOC和TN含量受水柱中生物活动的影响较大,上层水体中产生的有机碎屑是其重要的海生物质来源,而浅水区沉积物TN和TP含量受水柱中生物活动的影响相对较小.底层水年平均DO含量对沉积物TOC、TN分布也具有一定影响.
Based on the survey data of sedimentary chemistry and related environmental factors in the western Yellow Sea, the distribution characteristics of TOC, TN and TP in surface sediments of cold-water mass and near-shore areas are analyzed and discussed in detail. The results show that cold water mass The sediments in the sea area have higher water content, TOC, TN, TP content and N / P ratio than the nearshore sediments.The sediment types (particle size), material source and sedimentary environment significantly affect the TOC content, TOC value Mainly distributed in the muddy sedimentary area.The TN and TOC contents of the surface sediments showed a significant positive correlation in the cold water area, indicating that the homology between the two was good, but there was no significant correlation between TP and TOC and TN in the whole survey area, Indicating that the source is more complex.The significant differences between the physical and chemical properties of sediments in the waters of the South Yellow Sea and the shallow water areas in the western coast reflect their different controlled factors.The TOC and TN contents in the sediments of the cold water mass are affected by the biological activities in the water column And the organic debris produced in the upper water body is an important source of marine biomass, whereas the TN and TP contents in shallow water sediments are relatively less affected by the biological activities in the water column.The average DO content in the bottom water is less than that in the sediments Was TOC, TN distribution also has some influence.