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首页> 外文学位 >Identifying Nonpoint Sources of Phosphorus (P) and Nitrogen (N) Pollution and Dynamics, Internal Eutrophication and Anoxia Variability at a Tropical Freshwater Wetland (Laguna Cartagena, Puerto Rico).
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Identifying Nonpoint Sources of Phosphorus (P) and Nitrogen (N) Pollution and Dynamics, Internal Eutrophication and Anoxia Variability at a Tropical Freshwater Wetland (Laguna Cartagena, Puerto Rico).

机译：识别热带淡水湿地（拉古纳卡塔赫纳，波多黎各）的磷（P）和氮（N）污染和动力学，内部富营养化和缺氧变异性的面源。

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摘要

During the 1950s, Laguna Cartagena, a tropical freshwater wetland located in the Municipality of Lajas, in southwestern Puerto Rico, was impacted by increased loading of phosphorus from adjacent agricultural areas causing severe eutrophication and nutrient accumulation in sediments. This research explored the phosphorus (P) and nitrogen (N) dynamics at Laguna Cartagena through the examination of nonpoint nutrient sources and internal eutrophication, during the years 2010-11 (Phase One) and again in 2013-14 (Phase Two) subsequent a period of intensified management interventions (excavations (scraping) of sediment, vegetation removal, draining and drying, and burning) conducted during the summers of 2012 and 2013.;Results indicate that Laguna Cartagena remains affected by nonpoint sources of phosphorus pollution from runoff, mainly from agriculture and wastewater from rural residences. Similar phosphorus concentrations were observed at the channelized inflow of external waters to the lagoon during both Phase One and Phase Two. Laguna Cartagena tends to function as a sink for phosphorus (nutrient storage), but also experienced remarkable events as a source (release) of phosphorus to the water column. During Phase One, source and sink behavior was influenced by external factors of the hydrological regime (water level fluctuations, one week prior sample collection) and rainfall (one and two weeks prior to sample collection). However, during Phase Two, source and sink behavior was not influenced by external factors and the results suggest that the P dynamics were now influenced primarily by internal factors within the lagoon itself. Subsequent to the intensive the management interventions of 2012-13 this wetland manifested increased events of P release, mainly total phosphorus (TP), and increases in dissolved oxygen concentrations, as well as higher concentrations of phosphorus in the water flowing from the lagoon downstream to Boqueron Bay. Nitrogen concentrations found in water entering the system and in the water column of the lagoon indicate that the system is limited by nitrogen, accumulating high concentrations of this nutrient in sediments. Excavation, burning and draining of the lagoon promote the removal of accumulated organic matter, remove seeds and invertebrates that serve as food for waterfowl, reduce recruitment of fishes to the lagoon, and promote mineralization of nutrients through oxidation, and the entry of high concentrations of phosphorus back into the water column upon re-flooding.
机译：在1950年代，位于波多黎各西南部拉哈斯市的热带淡水湿地拉古纳·卡塔赫纳（Laguna Cartagena）受到邻近农业区磷负荷增加的影响，导致沉积物严重富营养化和养分积累。这项研究通过检查非点状营养源和内部富营养化来研究拉古纳卡塔赫纳的磷（P）和氮（N）动态，在2010-11年（第一阶段）以及2013-14年（第二阶段），随后是在2012年和2013年夏季进行的强化管理干预措施（沉积物的挖掘（刮除），植被去除，排水和干燥以及燃烧）的时期;结果表明，拉古纳卡塔赫纳仍然受到径流磷污染的非点源的影响来自农业和农村居民的废水。在第一阶段和第二阶段期间，在外部水到泻湖的通道化流入中观察到了相似的磷浓度。拉古纳卡塔赫纳（Laguna Cartagena）倾向于充当磷的汇（营养物存储），但也经历了显着的事件，作为磷向水柱的源（释放）。在第一阶段，源流和汇的行为受水文状况（水位波动，样本采集前一周）和降雨（样本采集前一两周）的外部因素影响。然而，在第二阶段，源和汇的行为不受外部因素的影响，结果表明，磷的动力学现在主要受泻湖内部的内部因素影响。在2012-13年度的密集管理干预措施之后，该湿地表现出P释放事件增加，主要是总磷（TP）增加，溶解氧浓度增加，并且从泻湖下游到下游的水中磷的浓度更高。博克龙湾。进入系统的水和泻湖水柱中的氮浓度表明系统受到氮的限制，氮在沉积物中积累了高浓度。泻湖的开挖，燃烧和排水促进去除积聚的有机物，去除用作水禽食物的种子和无脊椎动物，减少鱼类向泻湖的募集，并通过氧化促进营养物质矿化和高浓度鱼的进入。再次注水后，磷又回到水柱中。

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  • 作者

    Sanchez Colon, Yashira Marie.;

  • 作者单位

    Universidad del Turabo (Puerto Rico).;

  • 授予单位 Universidad del Turabo (Puerto Rico).;
  • 学科 Biogeochemistry.;Environmental management.;Water resources management.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 185 p.
  • 总页数 185
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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