Song Shu-Qun, Sun Jun, Shen Zhi-Liang, Wang Dan, Luan Qing-Shan
Key Laboratory of Marine Ecology & Environmental Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, Shandong, China.
Ying Yong Sheng Tai Xue Bao. 2008 Mar;19(3):658-66.
Based on the multi-discipline investigation in 28th February-10th March and 30th May-4th June, 2005, this paper studied the distribution of size-fractionated phytoplankton in the Yangtze River estuary and its adjacent waters, and the environmental factors that affected this distribution. The results showed that in winter, the average chlorophyll a concentration was 1.28 mg X m(-3), and the region with high concentration chlorophyll a was located near the river mouth. Small-sized phytoplankton (SSP, <20 microm) contributed 66.7% to the total phytoplankton biomass, but big-sized phytoplankton (BSP, >20 microm) was dominant in the plume system. In spring, the average chlorophyll a concentration in inner river and outer estuary was 0.67 and 6.03 mg x m(-3), respectively, and the maximum of chlorophyll a concentration appeared in the waters between 122.5 degrees E and 123.0 degrees E. The SSP dominated in the plume system, especially in the algal bloom frequently occurring area which located at south of survey area, contributed 83.5% to the total phytoplankton biomass. The vertical profile of size-fractionated chlorophyll a showed that with the increase of water depth, the SSP and BSP became equal in the offshores. Among the environmental factors in the Yangtze River estuary and its adjacent waters, salinity and nutrients were the main factors affecting the distribution and composition of size-fractioned phytoplankton biomass in winter and spring.
基于2005年2月28日至3月10日以及5月30日至6月4日的多学科调查，本文研究了长江口及其邻近水域不同粒径浮游植物的分布情况，以及影响这种分布的环境因素。结果表明，冬季叶绿素a平均浓度为1.28mg·m⁻³，叶绿素a高浓度区域位于河口附近。小型浮游植物（SSP，<20μm）占浮游植物总生物量的66.7%，但大型浮游植物（BSP，>20μm）在羽状锋区占主导地位。春季，内河和河口外海的叶绿素a平均浓度分别为0.67和6.03mg·m⁻³，叶绿素a浓度最大值出现在东经122.5°至123.0°之间的水域。SSP在羽状锋区占主导地位，尤其是在调查区域南部频繁发生藻华的区域，占浮游植物总生物量的83.5%。不同粒径叶绿素a的垂直分布表明，随着水深增加，近海小型和大型浮游植物的含量趋于相等。在长江口及其邻近水域的环境因素中，盐度和营养物质是影响冬春季节不同粒径浮游植物生物量分布和组成的主要因素。
