近30年来东海长江口泥质区浮游植物生产力与群落结构变化的生物标志物记录  

Biomarker Records of Phytoplankton Productivity and Community Structure Changes in the Mud Area of the Yangtze River Estuary in the East China Sea During the Last 30 Years

作　　者：郭新宇 张海龙[1] 李莉[1] 毕蓉[1] GUO Xin-Yu;ZHANG Hai-Long;LI Li;BI Rong(The Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学海洋化学理论与工程技术教育部重点实验室

出　　处：《中国海洋大学学报（自然科学版）》2020年第2期85-94,共10页Periodical of Ocean University of China

基　　金：国家自然科学基金重点项目(41630966)资助~~

摘　　要：随着人类活动的增加和全球气候变化的加剧,东海生态环境受到了人类活动和自然环境变化的双重影响。本文选择位于东海长江口泥质区的柱状样DH3-1进行生物标志物分析,利用多种生物标志物含量及相对比例重建了东海近30年(1983-2010年)浮游植物生产力、群落结构和陆源输入相对贡献的变化,并探究人类活动与自然因素产生的综合影响。结果表明:近30年来,浮游植物生产力呈现上升趋势;约1992-2001年,硅藻比例下降、甲藻比例上升,约2001年后硅藻比例上升、甲藻比例下降。陆源有机质含量在约1992-2004年呈现增加趋势,约2004年后相对降低;海源有机质含量则呈现持续增加趋势。东海近30年来浮游植物生产力的升高主要是因为人类活动剧增与上升流引发东海营养盐输入量增加。群落结构与陆源有机质含量交替变化可能是由不同年份人类活动与自然因素的作用强度不同导致的。Ecological environments in the East China Sea(ECS) have been strongly influenced by anthropogenic activities and natural environmental changes. In this study, the contents of biomarkers and their ratios in the core DH3-1 from the mud area of the Yangtze River Estuary in the ECS were investigated to reconstruct phytoplankton productivity, community structure and the relative contributions of terrestrial and marine organic matters from 1983 to 2010, The results show that overall phytoplankton productivity increased during the last 30 years. From 1992 to 2001, the relative contribution of dinoflagellates increased, while that of diatoms decreased. In contrast, we observed higher contributions of diatoms and lower ones of dinoflagellates since 2001. The contents of terrestrial organic matters showed an increased trend from 1992 to 2004 but decreased since 2004, while the contents of marine organic matters increased through the last 30 years. The results suggest that increased inputs of nutrients due to human activities and upwelling may cause high productivity in our study area. Moreover, human activities and upwelling-induced nutrient inputs may vary in different ways, and thus alter phytoplankton community structure and the relative contents of terrestrial versus marine organic matters during the last 30 years.

关 键 词：生物标志物 自然环境变化 柱状样 浮游植物生产力 海源有机质 上升流 生态环境 相对贡献 

分 类 号：P736.4[天文地球—海洋地质]