长江口和杭州湾海域生物生产力锋面及其生态学效应
Biological productivity front in the Changjiang Estuary and the Hangzhou Bay and its ecological effects
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摘要: 通过分析海洋生态学资料并结合卫星遥感、渔场及赤潮等资料,发现长江口和杭州湾及其毗邻海域生物生产力的锋面,在离长江口门和杭州湾口约100 km的长江冲淡水中部海域出现蓝细菌丰度、浮游植物现存量和初级生产力以及浮游动物的最大值,该锋面的存在和位置被水色遥感所确认.光和营养盐在此呈现最佳的权衡.在该锋区悬浮体浓度小于5 mg/dm3,盐度为25~30.在该锋面的西侧高的悬浮体浓度造成了浮游植物的光限制,其东侧距长江口和杭州湾口较远,陆源营养盐被稀释,加之浮游植物的消耗,造成了营养盐的限制.夏季水体的层化,增强了水体的垂直稳定,使这种分布格局更加显著.由于细菌多附着在悬浮颗粒物的表面,细菌丰度的最大值出现在近口门区的最大浊度带,在向外海方向随着悬浮体的沉降细菌丰度迅速降低.在生物生产力锋面,浮游植物的旺发导致水体跃层之上高溶解氧浓度和低营养盐浓度,尤其是PO4被耗尽,同时浮游动物饵料的丰富,造成浮游动物旺发;由于蓝细菌的快速增殖,其流式细胞测定的细胞粒径变小.生物生产力锋面的出现产生了显著的生态学效应,一方面造成某些经济鱼类产卵和索饵场的形成,例如鲐鲹鱼、马鲛鱼等;另一方面造成赤潮多发区和底层水缺氧区.Abstract: Through analyzing of multidisciplinary oceanography data of a clear spatial zonation of the parameters and a primary productivity front are found in the study areas.In the turbid river mouth phytoplankton biomass and productivity are low,although the concentrations of nutrients,e.g,NO3-,PO43-,etc.are high,but bacteria are active.On offshore ward,phytoplankton biomass and productivity increase gradually with suspended solids(SS)settling out.The maxima of phytoplankton parameters occur at about 100 km away from the river mouth and the east side of Zhoushan Archipelago,where SSconcentration is less than 5 mg/dm3 and salinity 25~30,which results in high concentration of dissolved oxygen,depletion of nutrients,particularly PO43- in the upper layer and the dominance of young Synechococcus cells with smaller size,due to their fast growth there.The front of zooplankton biomaas is resulted from the abundant phytoplankton,as its food.
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SHI Jun-xian, NING Xiu-ren, COURTIES C, et al. The patterns of distributions of bacteria, ATP and the relations with respiration rates and phytoplankton in the Changjiang Estuary and its adjacent East China Sea[J]. Chinese J Oceanol & Limnol,1992, 10(3): 278-289. NING Xiu-ren, VAULOT D, LIU Zhi-lin, et al. Standing stock and production of phytoplankton in the estuary of Changjiang (Yangtze River)and the adjacent East China Sea[J]. Marine Ecology(Progress Series), 1988, 49(10): 141-150. VAULOT D, NING X. Abundance and cellular characteristics of marine Synechococcus spp. in the dilution zone of the Changjiang (Yangtze River, China)[J]. Continental Shelf Research, 1988, 8(10): 1 171-1 186. NING Xiu-ren, COURTIES C. Relationships between chlorophyll a, bacteria, ATP, POC and respiration rates in the Changjiang Estuary and the dilution zone[J]. Acta Oceanol Sinica, 1992, 11(3): 425-434. LIU Hong-bin, HE De-hua. A preliminary research on zooplankton in the Changjiang Estuary and its adjacent waters:biomass, composition, distribution and the heavy metals contents[A]. YU Guo-hui, MARTIN J, ZHOU Jia-yi. Biogeochemical Study of the Changjiang Estuary[M]. Beijing:China Ocean Press, 1991. 188-199. BEARDSLEY R C, LIMEBURNER R, YU H, et al. Discharge of the Changjiang (Yangtze River)into the East China Sea[J]. Continental Shelf Research, 1985, 4: 57-76. YUAN Yao-chu, SU Ji-lan, XIA Xiao-ping. Diagnostic calculation of three-dimensional circulation in the East China Sea(summer 1984)[A]. SUN X. Kuroshio Symposium Series[C]. Beijing: China Ocean Press, 1987, 45-53. 赵宝仁,任广法,曹德明,等.长江口上升流海区的生态环境特征[J].海洋与湖沼,2001,32(3):327-333. 李季道,张经,黄大吉,等.长江口外氧的亏损[J].中国科学(D辑),2002,32(8):686-694. 中国海湾志编辑委员会.第二章:长江口[Z].中国海湾志:第十四分册——重要河口[M].北京:海洋出版社,1998.105-237. 农牧渔业部水产局,东海区渔业指挥部.东海区渔业资源调查和区划[M].上海:华东师范大学出版社,1987.661. MACALISTER RG, ELLIOTT J D, AKESTER S J, et al. Fisheries and Coastal Marine Resources Management and Development in the East China Sea[Z]. The Final Report of ADB TA Project, 1760-PRC[R]. Hampshire, 1994. MACALISTER RG, ELLIOTT J D, AKESTER S J, et al. Fisheries and Coastal Marine Resources Management and Development in the East China Sea[Z]. The Mid-Term Report of ADB TA Project, 1760-PRC[R]. Hampshire, 1993. 陆斗定.浙江近海夜光藻的分布及其生态学特点[J].东海海洋,1994,12(3):62-69. 国家海洋局.20世纪末中国海洋环境质量公报[R].北京:海洋出版社,2000.26. SKJOLDAL H R. Eutrophication and algal growth in the North Sea[A]. Proc Symp Mediterranean Sea2000[C]. Italy,1991. 1-30. RICHARDSON K. Harmful or exceptional phytoplankton blooms in the marine ecosystem[J]. Advances in Marine Biology,1997, 31: 301-385.
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