摘要
基于2009年6–9月,2014年5月,2014年7–8月在乳山湾外邻近海域的综合调查资料,分析了该开放海域水体与沉积物中氮、磷营养盐的组成和分布,并在潮汐潮流数值模式计算水通量的基础上分析了近岸开放区域无机氮(DIN)和无机磷(DIP)的循环与收支的主要过程,量化了潮汐潮流、初级生产的消耗与转化、底界面过程与内部循环等过程对氮和磷营养盐循环与收支的影响。结果表明,夏季乳山湾外邻近海域水体DIN和DIP的浓度与分布受陆源输入和潮汐潮流的共同影响,高值均出现在湾口区域;沉积物-水界面存在DIN和DIP从沉积物向上覆水释放的现象,使得底层水体的氮、磷营养盐浓度高于表层水体。氮的收支表明,研究海域水体内部循环过程是初级生产所需DIN的主要来源,占初级生产总消耗量的86%,其次是水交换作用(11%),底界面扩散对初级生产的贡献相对较小(3%);水体DIN的移出主要是通过埋藏、向外海的输送和水体反硝化作用,其比例分别为80%、16%和4%。磷的收支显示,研究海域水体内部循环过程贡献了初级生产所需DIP的91%,其次是水交换作用(9%),底界面扩散对初级生产的贡献小于1%;水体DIP支出主要是通过沉积埋藏和向外海的输送,其比例分别为67%和33%。研究结果表明内部循环过程是近海水体氮和磷获得补充的主要途径,不过外部来源的氮、磷营养盐结构与系统内部具有显著的差异,且系统内磷的埋藏效率要高于氮,其必将对乳山湾外邻近海域营养盐结构和初级生产产生长远的影响。
Based on the seven comprehensive surveys in the coastal area of Rushan Bay in summer of 2009 and 2014,the distribution of nitrogen and phosphorus nutrients and nutrient structure were analyzed,and the budgets of dissolved inorganic nitrogen(DIN)and dissolved inorganic phosphorus(DIP)were estimated based on the water balance calculated by Princeton Ocean Model(POM).The results show that the high concentrations of DIN and DIP in adjacent area of Rushan Bay in summer appears in the mouth area of Rushan Bay.Their concentrations and distributions are influenced by the terrestrial inputs,tides and currents significantly.The DIN and DIP effluxes from the sediment to the overlying water at the sediment-water interface result in the higher concentrations of DIN and DIP in the bottom water than those in the surface water.The budget of DIN shows that internal cycling is the dominant source of DIN for the primary production,accounting for 86%of uptake by primary production,followed by water exchange(11%),and benthic efflux(3%);the removal of DIN in the water column is dominant by sedimentation(80%),export to the offshore(16%),and denitrification(4%).The DIP budget shows that internal cycling in the water column is the dominant source of DIP for the primary production,accounting for 91%of uptake by primary production,followed by water exchange(9%),and benthic efflux(lower than 1%);the removal of DIP in the water column is also dominant by sedimentation(67%)and export to the off shore by water exchange(33%).Based on the budgets of DIN and DIP,internal recycling is the dominant source for both of DIN and DIP supplies in the coastal water column,and the burial efficiency of P is higher than N into the sediment in the area off Rushan Bay.However,the different nutrient structure between external and internal sources of the study area would result in a long-term effect on the nutrient balance and primary production due to the differential budget of DIN and DIP.
作者
臧家业
赵晨英
刘军
张爱军
尹训强
刘季花
王昊
王以斌
冉祥滨
Zang Jiaye;Zhao Chenying;Liu Jun;Zhang Aijun;Yin Xunqiang;Liu Jihua;Wang Hao;Wang Yibin;Ran Xiangbin(First Institute of Oceanography,Ministry of Natural Resource,Qingdao 266061,China;Laboratory for Marine Geology and Environment,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2019年第12期26-38,共13页
基金
国家自然科学基金（41806097,41376093）
中央级公益性科研院所基本科研业务费专项资金（2017Q10,2016T03）
关键词
氮
磷
营养盐结构
营养盐限制
收支
乳山湾
nitrogen
phosphorus
nutrient structure
nutrient limitation
flux and budget
Rushan Bay
