利用PHYSAT方法反演南海浮游植物优势类群分布的季节变化  

Seasonal Distribution of Dominant Phytoplankton Groups in the South China Sea Based on PHYSAT

作　　者：李月洋[1] 孙群[1] 王磊[1] 魏皓[2] 

机构地区：[1]天津科技大学海洋科学与工程学院,天津300457 [2]天津大学海洋科学与技术学院,天津300072

出　　处：《天津科技大学学报》2015年第5期42-47,77,共7页Journal of Tianjin University of Science & Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB403606;2010CB428904);国家自然科学基金资助项目(41376112;41276016;41406158)

摘　　要：基于水色遥感数据用PHYSAT算法反演了南海浮游植物优势类群分布的季节变化,结果表明:微型真核生物作为优势类群全年出现几率最大,原绿球藻次之,聚球藻再次之,硅藻最小;硅藻为优势类群的区域主要在近岸和陆架区,外海原绿球藻和聚球藻的优势度增加.在季节差异上,冬季微型真核生物为优势类群的区域在整个南海海区所占面积的百分比最高,春季原绿球藻比例最高,聚球藻呈双峰结构,在春季和秋季出现峰值,硅藻为优势类群区域的季节性差异较小.陆架、陆坡和海盆区浮游植物优势类群比例的季节变化相近,都表现为冬季微型真核生物的绝对优势和春季原绿球藻优势的大大增加.营养盐浓度分布的季节变化是引起浮游植物优势类群改变的主要影响因子,随着海区中营养盐浓度的降低,浮游植物优势类群由粒径较大的微型真核浮游生物向微微型浮游植物聚球藻和原绿球藻转变.PHYSAT algorithm was used to reproduce the average seasonal distribution of the dominant phytoplankton groups in the South China Sea based on water color satellite data. The results show that nanoeukaryote is the most dominant group in the South China Sea in the whole year, with Prochlorococcus, Synechococcus and diatoms following in turn. Dia- toms is mostly observed in the coastal and continental shelf areas, while Prochlo,vcoccus and Synechococcus dominance increased in the offshore. Nanoeukaryotes dominance is very high in winter but Prochlorococcus in spring. Synechococcus seasonal distribution is bimodal with peaks occurring in spring and autumn. The seasonal variation of diatoms dominance is very small. Seasonal variation of the proportion of phytoplankton dominant groups in continental shelf, continental slope and basin is very similar. Nanoeukaryotes are predominating in winter. The dominance of Prochlorococcus greatly increases in spring compared with other seasons. Seasonal variation of nutrient concentration is the main factor influencing the distribu- tion of the dominant phytoplankton groups. With the nutrient concentration decreasing, phytoplankton dominant group changes from nanoplanktonic nanoeukaryotes species to picoplanktonic Prochlorococcus and Syneehococcus species.

关 键 词：浮游植物优势类群 PHYSAT算法 水色遥感数据 WOA营养盐浓度 南海 

分 类 号：P735[天文地球—海洋生物学]