东、黄海表层悬浮颗粒物中类脂生物标志物的时空变化及其影响因素

发布时间：2018-01-11 19:27

  本文关键词：东、黄海表层悬浮颗粒物中类脂生物标志物的时空变化及其影响因素　出处：《中国海洋大学》2015年博士论文　论文类型：学位论文

  更多相关文章： 东、黄海 表层悬浮颗粒物 浮游植物 类脂生物标志物 时空分布

【摘要】：东、黄海是重要的陆架边缘海之一,其生态环境变化记载了海洋环境和人类活动的变迁。类脂生物标志物已经成功应用于东、黄海浮游植物及其群落结构的重建中,但类脂生物标志物对浮游植物的指示作用及其影响因素仍缺少浮游植物现代过程的充分验证。表层悬浮颗粒物是了解海洋浮游植物现代过程和类脂生物标志物之间关系的重要载体,本文通过对东、黄海2011年-2012年四个季节表层悬浮颗粒物中菜籽甾醇、甲藻甾醇和长链烯酮的测定,了解三种类脂生物标志物的时空变化。同时,结合物理化学相关参数进行PCA分析,探讨影响类脂生物标志物时空变化的主要因素,验证类脂生物标志物对浮游植物及其群落结构的指示作用,为使用类脂生物标志物重建东、黄海浮游植物及其群落结构提供现代依据。研究结果表明：春季,菜籽甾醇和甲藻甾醇高值出现在南黄海的中北部,长链烯酮含量较低,在81个站位中只有7个站位有检出。夏季,菜籽甾醇和甲藻甾醇的高值分布在长江口附近,长链烯酮的高值分布在南黄海西北部和中部。秋季,菜籽甾醇和甲藻甾醇高值位于南黄海海州湾附近、山东半岛南岸和长江口外东南部海域(即P断面),长链烯酮高值位于南黄海的东南部。冬季,菜籽甾醇和甲藻甾醇的高值分布在苏北浅滩和长江口外东南部海域(即P断面),长链烯酮的高值分布在东海的东南部海域。菜籽甾醇、甲藻甾醇和长链烯酮浓度总和(∑PB)的平均值存在明显的季节变化：夏季是最高,其次为秋季和春季,冬季最低。春、夏、秋、冬四个季节,菜子甾醇在三种类脂生物标志物中浓度最高。春季和夏季,菜籽甾醇/甲藻甾醇(B/D)出现在浮游植物生产力较高的海域。春季,B/D的高值与溶解无机氮/磷酸盐(DIN/P)的低值对应；秋季,B/D值与硅酸盐/溶解无机氮(Si/DIN)和DIN/P有关；夏季,B/D值与磷酸盐(P)限制有关,B/D值的分布主要受控于硅藻、甲藻对不同营养条件的竞争。本研究中类脂生物标志物的时空变化与色素等现场调查结果和遥感数据类似,进一步验证了类脂生物标志物对浮游植物及其群落结构的指示作用。控制类脂生物标志物时空变化的因素具有明显的区域特征和季节变化。夏季主要控制因素是长江冲淡水携带的营养盐；春季和秋季,主要控制因素是浊度；冬季整体较低的类脂生物标志物浓度主要受控于较低的温度和弱光照条件,但沉积物的再悬浮和黑潮次表层水携带的营养盐分别对冬季苏北浅滩和东海东南部海域(P断面)类脂生物标志物的影响不可忽视。
[Abstract]:East, Huang Hai is one of the important continental shelf marginal seas, its ecological environment changes recorded the changes of the marine environment and human activities. Lipoid biomarkers have been successfully used in the east. Huang Hai phytoplankton and its community structure reconstruction. However, the indicative effect of lipoid biomarkers on phytoplankton and its influencing factors are still lack of sufficient verification of modern phytoplankton process. Surface suspended particulate matter is one of the most important biomarkers to understand the modern process of marine phytoplankton and lipoid biomarkers. The important carrier of the relationship. Based on the determination of rapeseed sterol, pyrophytosterol and long chain ketene in surface suspended particulates of four seasons from 2011 to 2012, the temporal and spatial changes of three kinds of lipid biomarkers were studied. The main factors influencing the space-time variation of lipoid biomarkers were discussed by PCA analysis with physicochemical parameters, and the indication of lipoid biomarkers to phytoplankton and its community structure was verified. Huang Hai phytoplankton and its community structure can be reconstructed by using lipoid biomarkers. The results showed that the high values of rapeseed sterol and pyrophytosterol appeared in the central and northern part of South Huang Hai in spring. The content of long chain ketene was relatively low, only 7 out of 81 stations were detected. In summer, the high values of rapeseed sterols and pyrenosterols were distributed near the Changjiang Estuary. In autumn, the high values of rapeseed sterol and pyrophytosterol were located in the sea area (section P) near the southern #internal_person1# Bay, the southern coast of Shandong Peninsula and the southeast of the Yangtze River Estuary. The high value of long chain ketene is located in the southeast of south Huang Hai. In winter, the high values of rapeseed sterol and pyrenosterol are distributed in the shoal of northern Jiangsu and the southeast sea area outside the Changjiang Estuary (P section). The high value of long chain ketene is distributed in the southeast sea of the East China Sea. The mean values of total concentration of rapeseed sterol, dinosterol and long chain ketene (鈭，

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