Watershed Export Events and Ecosystem Responses in the Mission–Aransas National Estuarine Research Reserve, South Texas
Watershed Export Events and Ecosystem Responses in the Mission–Aransas National Estuarine Research Reserve, South Texas
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南德克萨斯州阿兰萨斯国家河口研究保护区的流域输出事件和生态系统响应
DOI：
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发表时间：
2009
影响因子：
2.7
通讯作者：
J. McClelland
中科院分区：
文献类型：
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作者：
R. F. Mooney;J. McClelland
虽然从土地的投入被认为是重要的资源支持生产的河口，风暴事件在资源输送和河口系统的脉冲输入的反应中发挥的作用不太好理解。在德克萨斯州南部的米逊-阿兰萨斯国家河口研究保护区检查了（1）通过使命河和阿兰萨斯河的流域输出的时间变化以及（2）科帕诺湾的营养物和有机物动态。无机营养盐，溶解有机质（DOM），和颗粒有机质（POM）的浓度在河流中的排放量变化很大，作为碳和氮的稳定同位素比值的POM。考虑到这些变化对于计算可靠的流域出口估计数至关重要。在科帕诺湾，可溶性活性磷，POM和DOM保持升高几个月后，主要径流事件，而无机氮迅速耗尽。叶绿素a浓度和POC-δ 13 C表明，增加POM浓度与增加原位生产。
While inputs from land are recognized as important resources supporting production in estuaries, the role that storm events play in resource delivery and the response of estuarine systems to pulsed inputs are less well appreciated. Temporal variations in (1) watershed export via the Mission and Aransas rivers and (2) nutrient and organic matter dynamics in Copano Bay were examined in the Mission–Aransas National Estuarine Research Reserve, south Texas. Inorganic nutrient, dissolved organic matter (DOM), and particulate organic matter (POM) concentrations in the rivers varied substantially with discharge, as did carbon and nitrogen stable isotope ratios of POM. Accounting for these variations was critical for calculating robust watershed export estimates. In Copano Bay, soluble reactive phosphorus, POM, and DOM remained elevated for several months following major runoff events, whereas inorganic nitrogen was rapidly depleted. Chlorophyll-a concentrations and POC-δ13C in Copano Bay showed that increased POM concentrations were linked to enhanced in situ production.