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首页> 外文期刊>Marine Chemistry >Groundwater-surface water exchange in a mangrove tidal creek: Evidence from natural geochemical tracers and implications for nutrient budgets
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Groundwater-surface water exchange in a mangrove tidal creek: Evidence from natural geochemical tracers and implications for nutrient budgets

机译：红树林潮汐河流中的地下水-地表水交换：来自自然地球化学示踪剂的证据及其对养分预算的影响

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摘要

Assessing submarine ground water discharge (SGD) in mangroves can be challenging due to the complex, heterogeneous nature of sediments and temporally dynamic water flows. Here, we use natural tracers (i.e., radon and radium isotopes) to quantify groundwater-surface water exchange in a mangrove tidal creek at the ecosystem scale, and to assess whether SGD was a source of dissolved inorganic and organic nutrients to the nearby estuary. Hourly sampling for over 27 h in the winter and 30 h in the summer revealed clear tidal trends for ~(222)Rn, ~(224)Ra, ~(223)Ra. ~(226)Ra, dissolved oxygen, ammonium, and dissolved organic nitrogen (DON) in a mangrove tidal creek with no upstream freshwater inputs (Kangaroo Island, Southern Moreton Bay, Australia). Nitrate, phosphate and dissolved organic phosphorus (DOP) did not show a clear tidal trend. A mass balance revealed that 5-12% of the tidal prism volume infiltrated the sediments and drained back to the creek at low tide. Groundwater exchange accounted for nearly all the ammonium and about 30% of the DON exported by the creek. Crab burrows were a major factor influencing groundwater exchange in this tidal creek. A detectable ~(226)Ra (half-life of 1600 years) enrichment in the creek at low tide could only be explained by the construction of new crab burrows during each tidal cycle exposing old sediments. Overall, the concentration of groundwater tracers and nutrients was higher in the summer most likely due to increased crab activity and organic matter degradation in the warmer months. Respiration of belowground organic matter apparently released nitrogen to groundwater seeping out from the creek bank at low tide and increased N:P ratios of surface water draining from mangroves. Therefore, we hypothesize that outwelling from mangroves with high SGD may influence the composition of downstream biological communities by altering estuarine N or P limitation conditions.
机译：由于沉积物的复杂性，非均质性和随时间变化的水流，评估红树林中的海底地下水排放（SGD）可能具有挑战性。在这里，我们使用自然示踪剂（即ra和镭的同位素）来量化红树林潮汐小溪在生态系统范围内的地下水-地表水交换，并评估SGD是否是附近河口溶解的无机和有机营养物的来源。冬季每小时采样超过27小时，夏季每小时采样30小时，发现〜（222）Rn，〜（224）Ra，〜（223）Ra的趋势明显。 〜（226）Ra，无上游淡水输入的红树林潮汐小溪中的溶解氧，溶解氧，铵和溶解有机氮（DON）（澳大利亚，南莫顿湾，袋鼠岛）。硝酸盐，磷酸盐和溶解的有机磷（DOP）未显示明显的潮汐趋势。质量平衡表明，潮汐棱镜体积的5-12％会渗入沉积物，并在退潮时流回小河。地下水交换几乎占了所有铵盐的总量，约占小河出口的DON的30％。螃蟹洞穴是这条潮汐小溪中影响地下水交换的主要因素。在退潮时，小溪中可检测到的〜（226）Ra（半衰期为1600年）富集只能用每个潮汐周期中新的蟹洞的构造来解释，这些蟹洞暴露了旧的沉积物。总体而言，夏季中地下水示踪剂和营养物的浓度较高，这很可能是由于螃蟹活动增加和在温暖月份中有机物降解所致。在低潮时，地下有机物的呼吸作用显然使氮从地下水中渗出，并从小溪的岸边渗出，并增加了从红树林中排出的地表水的N：P比。因此，我们假设从具有较高SGD的红树林中外游可能通过改变河口N或P限制条件来影响下游生物群落的组成。

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  • 来源
    《Marine Chemistry》 |2013年第20期|27-37|共11页
  • 作者

    Justin Gleeson; Isaac R. Santos; Damien T. Maher; Lindsay Golsby-Smith;

  • 作者单位

    Centre for Coastal Biogeochemistry. School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;

    Centre for Coastal Biogeochemistry. School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;

    Centre for Coastal Biogeochemistry. School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;

    Centre for Coastal Biogeochemistry. School of Environment, Science and Engineering, Southern Cross University, PO Box 157, Lismore, NSW 2480, Australia;

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  • 正文语种 eng
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  • 关键词

    Permeable sediments; Subterranean estuaries; Carbon; Estuary; Tidal pumping;

    机译：渗透性沉积物;地下河口;碳;河口;抽潮;

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