2008年冬季西太平洋表层海水浮游藻类分布特征——分子有机地球化学研究  

PHYTOPLANKTON DISTRIBUTION IN SURFACE WATER OF WESTERN PACIFIC DURING WINTER,2008: A STUDY OF MOLECULAR ORGANIC GEOCHEMISTRY

作　　者：董良[1] 李丽[1] 王慧[1] 贺娟[1] 魏玉利[1] 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092

出　　处：《海洋地质与第四纪地质》2012年第1期51-59,共9页Marine Geology & Quaternary Geology

基　　金：国家重点基础研究发展规划项目(G2007CB815904);国家自然科学基金项目(40976022;41023004);上海市科研创新项目(12ZZ031)

摘　　要：通过对西太平洋海区表层海水颗粒物的过滤收集,利用有机地球化学方法,提取了与浮游植物相关的脂类分子,如菜子甾醇、甲藻甾醇、直链烯酮、长链二醇,分别对应于硅藻、甲藻、颗石藻、黄绿藻,分析探讨了以浮游植物生物标志物为基础的海洋生物群落和生物量的变化特征及其影响因素。研究结果表明,利用脂类标志物方法所得生物量与海洋叶绿素分布有较好的对应关系,是一种有效的重建海洋浮游植物生产力与群落结构的方法。该区域浮游植物生物分布呈明显的区域特征,长江河口陆架区域最高,其次为新几内亚群岛东部沿岸区和菲律宾群岛沿岸,而远洋区域最低。造成该结果的主要因素是河流、洋流以及区域地貌、沉积物再悬浮。硅藻由于其对营养物质的竞争优势,丰度普遍较高,其次为甲藻,而颗石藻、黄绿藻含量较低。该研究成果不仅可用于现代海洋生态结构变化的检测,更将为利用脂类分子进行古海洋群落结构的真实重建提供重要的科学依据。Suspended particles in the West Pacific surface water were collected during the KX08-973 Cruise（Nov. 14,2008 -Jan. 19,2009）. Four kinds of nosterol, C37-Alkenone, and 1, 15-C30 alkyl-di ophores,and Eustigmatophytes algae were collec influencing factors of the phytoplankton biomass distribution. The results show that the obtained phytoplankton lipids biomarkers, i.e. Brassicasterol,Di- ol, corresponding to diatoms, dinoflagellates, coccolith- ted by organic geochemistry method. The variability and and communities structure were studied according to their biomass are correlated well with the Chl-a,indicating thevalidation of biomarker lipids to the reconstruction of the ocean productivity. The biomass distribution hasdistinct regional differentiation, highest in Yangtze River estuary and related shelf areas, followed by the area off eastern New Guinea and the zone off eastern Philippines, with the lowest in the pelagic. Fluvialtransport,ocean currents, regional landform configurations and resuspension of the shelf sediment are the main factors effecting the phytoplanktons biomass distribution. As the result of competition for nutrient, the phytoplanktons biomass is dominated by diatom, with dinoflagellate, coccolithophores and Eustigmato-phytes as minor contributors. The data obtained from the present research can be applied not only to mod-ern marine ecological investigation, but also for paleoceanographic reconstruction.

关 键 词：生物标志化合物 表层悬浮颗粒物 藻类生物量 西太平洋 

分 类 号：P736.22[天文地球—海洋地质]