2014年冬季热带西太平洋雅浦Y3海山浮游植物叶绿素a浓度及粒级结构  

CHLOROPHYLL A CONCENTRATION AND SIZE STRUCTURE OF PHYTOPLANKTON AT YARP Y3 SEAMOUNT IN TROPICAL WEST PACIFIC IN WINTER 2014

作　　者：张文静[1,2] 孙晓霞[1,3] 陈芸燕[1,2] 李俊磊[1,2] 杜娟[1] 

机构地区：[1]中国科学院海洋研究所山东胶州湾海洋生态系统国家野外科学观测研究站,青岛266071 [2]中国科学院大学,北京100049 [3]青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室,青岛266071

出　　处：《海洋与湖沼》2016年第4期739-747,共9页Oceanologia Et Limnologia Sinica

基　　金：中国科学院海洋先导科技专项(A类);XDA11030204号;国家重点基础研究发展计划(973)资助项目;2014CB441504号

摘　　要：2014年冬季对西太平洋雅浦区Y3海山及其邻近大洋海域不同粒径浮游植物叶绿素a浓度进行了现场观测,同时结合温度、盐度、营养盐数据,分析了Y3海山区总叶绿素a浓度分布情况,不同粒级浮游植物对总叶绿素a浓度的贡献率及其与环境因子的关系,并与热带西太平洋大洋区(DY断面)进行了比较。结果表明:Y3海山A、B断面与DY断面水体平均叶绿素a浓度相差不大,分别为0.057、0.054和0.051mg/m3,A、B和DY三个断面各水层(0、30、75、100、150和200m)叶绿素a浓度变化范围分别为0.009—0.205、0.005—0.236和0.007—0.229mg/m3。不同粒级浮游植物的叶绿素a占总叶绿素a的比例从大到小依次为微微型浮游植物、微型浮游植物和小型浮游植物,三者在各断面的比例分别为A断面:59.97%,25.39%,14.64%;B断面:50.87%,30.70%,18.43%;DY断面:55.87%,29.87%,14.26%。微微型浮游植物在整个调查区域为优势类群,在A、B和DY三个断面的平均浓度分别为0.025、0.026和0.029mg/m3。各站位均有次表层叶绿素a浓度最高值现象,其中Y3海山区西南部和东南部为叶绿素a浓度高值区。洋流、温度和营养盐均对叶绿素a浓度分布有一定的影响。本研究发现海山经典假说不适用于2014年冬季的Y3海山区。The size-fractionated chlorophyll a concentration（Chl a）, temperature, salinity, and nutrients at Seamount Y3 near Yarp Trench in the western Pacific in winter 2014 were investigated. In terms of Chl a, size-fractionated contribution to the total Chl a, and correlation between Chl a and ambient factors, Seamount Y3（Transects A and B） was compared with the tropical western Pacific（Transect DY）. The results indicate that there were no obvious differences among Transects A, B and DY in average Chl a（0.057, 0.054, and 0.051 mg/m^3, respectively）, and in Chl a range in 0, 30, 75, 100, 150, and 200 m depth（0.009—0.205, 0.005—0.236, and 0.007—0.229 mg/m^3, respectively）. The size structures in the 3 transects were similar. Specifically, the proportion of Chl a from micro-phytoplankton, nano-phytoplankton, to pico-phytoplankton was in a descend order, i.e., 59.97%, 25.39%, 14.64% for Transect A; 50.87%, 30.70%, 18.43% for Transect B; and 55.87%, 29.87%, 14.26% for Transect DY. The average pico-phytoplankton Chl a was 0.025, 0.026, and 0.029 mg/m^3, respectively. Phytoplankton was dominant, a subsurface Chl a maximum was common in all the study region, and higher Chl a was recorded to the southwest and southeast of Y3 Seamount. The Chl a distribution was affected by currents, temperature, and nutrients. The above data show that traditional explanation on Chl a in seamount does not fit for the case of Seamount Y3 in winter 2014.

关 键 词：西太平洋海山 浮游植物叶绿素a 粒级结构 环境因子 

分 类 号：P717.04[天文地球—海洋科学]