海洋科学2015，Vol.39Issue(4)：125-134,10.DOI:10.11759/hykx20140714001
长江口营养盐结构特征及其对浮游植物的限制
Structure characteristics of nutrients and their restrictive ef-fect on phytoplankton in the Yangtze River Estuary
摘要
Abstract
The concentrations and spatial distribution of nutrients, nutrients structure characteristics and their re-strictive effect on phytoplankton in the Yangtze River Estuary and the adjacent East China Sea were studied on the basis of two cruises in May and November. The results showed that the concentrations of NO-3-N and NO-2-N were higher in spring and lower in autumn outside the mouth, while PO3-4-P,SiO2-3-Si and NH+4-N have the op-posite seasonal distribution. The concentrations of NO-3-N,PO3-4-P,SiO2-3-Si and NH+4-N were higher in autumn than those in spring inside the mouth. The concentrations of NO-3-N,PO3-4-P and SiO2-3-Si decreased from the inshore to the offshore gradually, but the distribution regularity of NO-2-N and NH-4-N was not obvious.NO-3-N was the main chemical pattern of DIN and occupied about 95% in spring and 83% in autumn in the water area. The proportion of DIN/P was above 16 in both spring and autumn, indicating the excessive DIN input in the estuary. The ratio of Si/DIN was below 1 in spring and higher than 1 in autumn. Due to the partly bloomed diatom in spring. The DIN/P ratio increased and Si/DIN ratio decreased abnormally. In autumn, affected by Subei Coastal Water, the northwest waters showed low DIN/P values and high Si/DIN distributions. In the investigated waters, the PO3-4-P relative potential nutrients limitation was revealed under the influence of Changjiang Dilution Water with high DIN and SiO2-3-Si both in spring and autumn, while regional PO3-4-P and SiO2-3-Si absolute limitation occurred in spring as a result of massive PO3-4-P and SiO2-3-Si uptake by phytoplankton. When both absolute limitation and relative potential nutrients limitation were considered, 15.38% of the stations presented PO3-4-P limitation which was more serious than that in the 1990's .关键词
营养盐/营养盐结构/绝对限制/潜在相对限制/长江口Key words
nutrients/nutrients structure/absolute restriction/relative potential nutrients limitation/Yangtze River Estuary分类
海洋科学引用本文复制引用
李亚力,沈志良,线薇微,刘素美..长江口营养盐结构特征及其对浮游植物的限制[J].海洋科学,2015,39(4):125-134,10.基金项目
国家自然科学基金面上项目(41176138、31272663) （41176138、31272663）
国家基金委-山东省联合基金(U1406403) （U1406403）
国务院三峡工程建设委员会资助项目(JJ 2013-011) （JJ 2013-011）
