CHANGES IN NUTRIENT STRUCTURE OF RIVER-DOMINATED COASTAL WATERS - STOICHIOMETRIC NUTRIENT BALANCE AND ITS CONSEQUENCES
CHANGES IN NUTRIENT STRUCTURE OF RIVER-DOMINATED COASTAL WATERS - STOICHIOMETRIC NUTRIENT BALANCE AND ITS CONSEQUENCES
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DOI：
10.1016/s0272-7714(05)80014-9
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发表时间：
1995-03-01
影响因子：
2.8
通讯作者：
DORTCH, Q
中科院分区：
文献类型：
--
作者：
JUSTIC, D;RABALAIS, NN;DORTCH, Q
我们对两个河流主导的沿海生态系统（亚得里亚海北部和墨西哥湾北部）的大量营养数据集进行了分析，证明了30年来地表营养比率的显著变化。硅：氮的比值降低了，表明硅限制的潜力增加了。氮：磷和硅：磷的比例也发生了很大的变化，沿海的营养结构变得更加平衡，对浮游植物生长的限制可能会减少。在这些条件下，浮游植物净生产力可能会增加，并伴随着底水缺氧的增加和群落物种组成的重大变化。这些发现支持了一种假设，即迄今为止沿海富营养化的增加可能与化学计量营养平衡有关，原因是硅限制的潜力增加，氮和磷限制的潜力减少。在世界范围内，受人为养分负荷影响的河流附近的沿海生态系统可能经历类似的变化。
We present an analysis of extensive nutrient data sets from two river-dominated coastal ecosystems, the northern Adriatic Sea and the northern Gulf of Mexico, demonstrating significant changes in surface nutrient ratios over a period of 30 years. The silicon:nitrogen ratios have decreased, indicating increased potential for silicon limitation. The nitrogen:phosphorus and the silicon:phosphorus ratios have also changed substantially, and the coastal nutrient structures have become more balanced and potentially less limiting for phytoplankton growth. It is likely that net phytoplankton productivity increased under these conditions and was accompanied by increasing bottom water hypoxia and major changes in community species composition. These findings support the hypothesis that increasing coastal eutrophication to date may be associated with stoichiometric nutrient balance, due to increasing potential for silicon limitation and decreasing potential for nitrogen and phosphorus limitation. On a worldwide basis, coastal ecosystems adjacent to rivers influenced by anthropogenic nutrient loads may experience similar alterations.