Spatial characterization of water quality in a karstic coastal lagoon without anthropogenic disturbance:: a multivariate approach
Spatial characterization of water quality in a karstic coastal lagoon without anthropogenic disturbance:: a multivariate approach
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DOI：
10.1016/s0272-7714(03)00112-4
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发表时间：
2003-11-01
影响因子：
2.8
通讯作者：
Herrera-Silveira, JA
中科院分区：
文献类型：
--
作者：
Medina-Gómez, I;Herrera-Silveira, JA
齐拉姆泻湖位于墨西哥湾尤卡坦半岛中部海岸，是一个浅水体，平均深度0.6 m，面积9.4 km(2)。大量的地下水输入沿着系统分布，代表了硝酸盐和硅酸盐的连续来源。由于人类活动稀少，所以保存完好。这种原始条件表明营养动态的变化主要与自然行为有关。 1998年9月至1999年8月每月取样一次。在9个站测量了理化参数、无机养分和叶绿素-a。多变量分析显示盐度梯度和营养物浓度是描述泻湖水文异质性的最重要变量。根据这些关键参数，吉兰泻湖的分类分析确定了三个水文亲和区（HAZ）；东、西区雨季水体停留时间较长、盐度较低；中心区停留时间较短，无机养分浓度较低。 Dzilam 泻湖是一个 NO3- 汇，也是 NO2- 和 NH4+ 的净源。可溶性活性磷略有限定，可溶性活性二氧化硅接近保守条件。 (C) 2003 Elsevier Ltd. 保留所有权利。
Dzilam Lagoon, located in the central coast of Yucatan, Gulf of Mexico, is a shallow water body with average depth of 0.6 m and area of 9.4 km(2). Numerous groundwater inputs are distributed along the system representing a continuous source of nitrates and silicates. Due to scarce anthropogenic activity, it is well preserved. Such pristine conditions suggest that changes on nutrient dynamics are mostly related to natural behavior. Monthly samples were taken from September 1998 to August 1999. Physicochemical parameters, inorganic nutrients and chlorophyll-a were measured in nine stations. A multivariate analysis showed salinity gradient and nutrient concentration as the most significant variables in describing lagoon hydrologic heterogeneity. On the basis of those critical parameters, classification analysis of Dzilam Lagoon identified three hydrological affinity zones (HAZ); East and West Zone characterized by higher water residence time and lower salinities during the rainy season; Central Zone with lower residence time and lower inorganic nutrients concentration. Dzilam Lagoon was a NO3- sink and a net source for NO2- and NH4+. Soluble reactive phosphorus was slightly defined and soluble reactive silica was close to conservative condition. (C) 2003 Elsevier Ltd. All rights reserved.