摘要
利用 1997年秋季和 1998年春季对长江口邻近海域两个航次的调查结果 ,对该海域营养盐分布、结构特征以及其主要控制过程进行了探讨 .结果表明 ,该海域的营养盐分布及结构具有明显的季节变化 ,秋季海水中NO3 - N、SiO3 2 - Si及PO43 - P、DOP、PP均高于春季 ,平均含量分别为 4 .97、11.6、0 .4 4、0 .2 6、0 .82 μmol·L-1,而春季则是NO2 - N、NH4+ N、DON、PN含量高 ,平均含量分别为 0 .70、2 .2 6、9.88、7.88μmol·L-1.PP(5 4 % )和PO43 - P(5 1% )分别为秋季和春季磷的主要形态 ,两个季节氮结构基本一致 ,均以DON和PN为主 .除春季PO43 - P外 ,营养盐受长江冲淡水等陆源输入的影响而呈现近岸含量较高 ,溶解无机氮秋季以NO3 - N为主而春季则以NH4+ N为主 ,秋季PO43 P同时来源于长江冲淡水和台湾暖流 ,而春季则主要来源于台湾暖流 ,显示出春季台湾暖流对调查海区的影响程度大于秋季 .
In this paper,the nutrient distribution, its structural characteristic and controlling mechanism around the Changjiang River estuary during Autumn 1997 and Spring 1998 were discussed , and a clear seasonal variation of nutrient distribution and structure was observed in this area. The concentrations of NO 3 --N, SiO 3 2--Si, PO 4 3--P, DOP, PP and TP in Autumn 1997 were higher than those in Spring 1998, and their average concentrations were 4.97, 11.6, 0.44, 0.26, 0.82 and 1.52 μmol·L -1, respectively. However, the concentrations of NO 2 --N, NH 4 +-N, DON, PN and TN in Spring 1998 were higher than those in Autumn 1997, with the average concentration of 0.70, 2.26, 9.88, 7.88 and 25.3 μmol·L -1, respectively. The main form of phosphorus in Autumn 1997 was PP, with the percentage about 54%, while PO 4 3--P was the dominant fraction,with about 51% of phosphorus in Spring 1998. Both DON and PN were the main fractions of nitrogen in Autumn 1997 and Spring 1998 as well. Due to the influences of the Changjiang dilution water, the concentrations of phosphate, nitrate and silicate along the coastal area were higher than those in the outer area, except the phosphate in Spring 1998, which mainly came from Taiwan warm current. It indicated that the distribution of the nutrients in the survey area was mainly controlled by the Changjiang dilution water and the high salinity seawater from the Taiwan warm current, and the influence of Taiwan warm current on phosphate was larger in Spring than in Autumn.
出处
《应用生态学报》
CAS
CSCD
2003年第7期1086-1092,共7页
Chinese Journal of Applied Ecology
基金
国家重点基础研究发展规划项目 ( 2 0 0 1CB40 970 3 )
国家自然科学基金 ( 4 0 13 60 2 0和 499760 2 7)
教育部重点基金 ( 0 1110 )
山东省自然科学基金 (L2 0 0 0E0 1)
中日合作东海特定海区资助项目 .
关键词
营养盐分布长江口
控制过程
Nutrient distribution, Changjiang River estuary, Controlling mechanism
