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首页> 外文期刊>Polish Journal of Environmental Studies. >Comparative Study of Nitrogen Dynamics of Three Wetlands in the Higashi-Hiroshima Area, Western Japan
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Comparative Study of Nitrogen Dynamics of Three Wetlands in the Higashi-Hiroshima Area, Western Japan

机译：日本西部东广岛地区三个湿地氮素动态的比较研究

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摘要

In a watershed, wetlands may function either as a nutrient sink or as a source and net transformer of nutrients. One of the most widely recognized functions of wetlands is the ability to reduce or remove nutrients from surface water passing through the wetland. In order to compare nitrogen retention capacity, we investigated the ability of three wetlands to reduce or remove dissolved nitrogen from the surface water that passed through them. Although the three wetlands were located within one watershed, their surrounding land uses were significantly different. In this study, the surface water of each of the three wetlands was sampled from five points (the main inlet, outlet and three points inside the wetland) during the second week of every month, from December 2005 to December 2006, in order to measure dissolved nitrogen concentrations and their components (nitrate, nitrite, ammonium, and dissolved organic nitrogen). During the growing season (June-July), a vegetation census was conducted in each wetland that included an estimation of the percent of coverage and a survey of the diversity of vegetation. Investigation into the seasonality of the source or sink function indicated that wetland A had a source-role in three seasons (winter, spring, and summer) and a sink role during the autumn season. Wetland B had a sink-role during two seasons (winter and summer), a source-role in the spring, and a neutral role in autumn. Wetland C had a sink-role for dissolved nitrogen in surface water during all seasons of the study period. Results from the vegetation census indicated that Typha latifolia was the dominant species for wetland A, Potamogeton cristatus was dominant for wetland B, and Ischene globosa was dominant for wetland C. The percentage of vegetation cover was estimated as 83%, 35%, and 53% in wetlands A, B, and C, respectively. The results of this study indicated that the surrounding land use and human alterations to the environment had played a significant role in determining the function of each wetland as a sink, source or transformer for dissolved nitrogen in surface water passing through the wetlands. It emerges from this study that the seasonal changes in the function of the wetland for dissolved nitrogen as well as variations in vegetation cover (%) and dominant plant species, were affected by the composition of the surrounding lands. This study revealed not only that the role (as source, sink or transformer) that the wetland plays for dissolved nitrogen might change because of the above-mentioned factors, but also that this role could either be stable, or that it could change seasonally. Finally, an investigation of the components of total dissolved nitrogen in these three wetlands showed that under the influence of the surrounding land use, NH_4~+ was the dominant form in wetland A (with a high percentage of urban area), and (NO_3~-+NO_2~-) were sub-dominant in wetland B (with a high percentage of agricultural area). Dissolved organic nitrogen was the dominant form in wetland C (with 0% of urban area and a high percentage of forest area). According to the results, dissolved organic nitrogen was not always the dominant component of the dissolved nitrogen, so that with an increase in the percentage of urban area, DIN was the dominant form and vice versa. Based on the results, the retention capacity of the wetlands for dissolved nitrogen in surface water increased in conjunction with a decrease in the level of urban land use.
机译：在流域中，湿地可能充当养分汇或养分的来源和净转化者。湿地最广为人知的功能之一是能够减少或去除通过湿地的地表水中养分的能力。为了比较固氮能力，我们研究了三个湿地减少或去除穿过它们的地表水中溶解氮的能力。尽管这三个湿地位于一个流域内，但是它们周围的土地用途却有很大不同。在这项研究中，从2005年12月至2006年12月的每个月的第二周，从五个点（湿地的主要入口，出口和三个点）采样了三个湿地中的每一个的地表水，以便进行测量溶解氮浓度及其成分（硝酸盐，亚硝酸盐，铵和溶解的有机氮）。在生长季节（6月至7月），在每个湿地进行了一次植被普查，其中包括估算覆盖率和调查植被的多样性。对源或汇功能的季节性的调查表明，湿地A在三个季节（冬季，春季和夏季）都有源角色，而在秋季则有汇作用。湿地B在两个季节（冬季和夏季）有一个下沉角色，在春季有一个源角色，在秋季有一个中立角色。在研究期间的所有季节，湿地C都有一个下沉的作用，可以溶解地表水中的氮。植被普查结果表明，香蒲是湿地A的优势种，Potamogeton cristatus是湿地B的优势种，而Ischene globosa则是湿地C的优势种。植被覆盖率估计为83％，35％和53 ％分别位于湿地A，B和C中。这项研究的结果表明，周围的土地利用和人类对环境的改变在决定每个湿地作为通过湿地的地表水中溶解氮的汇，源或转换器的功能方面起着重要作用。从这项研究中可以看出，湿地对溶解氮的功能的季节变化以及植被覆盖率（％）和主要植物物种的变化都受到周围土地组成的影响。这项研究不仅揭示了由于上述因素，湿地在溶解氮中所起的作用（作为源，汇或变压器）可能会改变，而且这种作用可能是稳定的，也可能是季节性的。最后，对这三个湿地中总溶解氮的组成进行了调查，结果表明，在周围土地利用的影响下，NH_4〜+是湿地A（占城市地区的百分比很高）和（NO_3〜 -+ NO_2〜-）在湿地B中占主导地位（农业面积百分比高）。溶解有机氮是湿地C（占城市面积的0％，森林面积的百分比高）的主要形式。根据结果​​，溶解的有机氮并不总是溶解氮的主要成分，因此，随着城市面积百分比的增加，DIN是主要的形式，反之亦然。根据这些结果，湿地对地表水中溶解氮的保留能力随着城市土地利用水平的降低而增加。

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  • 来源
    《Polish Journal of Environmental Studies.》 |2009年第4期|617-626|共10页
  • 作者

    A. Haidary; K. Nakane;

  • 作者单位

    Division of Environmental Dynamics and Management, Graduate School of Biosphere Science, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima 739-8521, Japan;

    Division of Environmental Dynamics and Management, Graduate School of Biosphere Science, Hiroshima University, 1-7-1 Kagamiyama, Higashi-Hiroshima 739-8521, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    nitrogen; wetlands;

    机译：氮;湿地;

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