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首页> 外文期刊>Science of the total environment >Trends in hydrometeorological conditions and stream water organic carbon in boreal forested catchments
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Trends in hydrometeorological conditions and stream water organic carbon in boreal forested catchments

机译：北方森林流域的水文气象条件和溪流水有机碳趋势

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摘要

Temporal trends in stream water total organic carbon (TOC) concentration and export were studied in 8 forested headwater catchments situated in eastern Finland. The Seasonal Kendall test was conducted to identify the trends and a mixed model regression analysis was used to describe how catchment characteristics and hydrometeorological variables (e.g. precipitation, air and stream water temperatures, and atmospheric deposition) related to the variation in the concentration and export of stream water TOC. The 8 catchments varied in size from 29 to 494 ha and in the proportion of peatland they contained, from 8 to 70%. Runoff and TOC concentration were monitored for 15-29 years (1979-2006). Trends and variation in TOC levels were analysed from annual and seasonal time series. Mean annual TOC concentration increased significantly in seven of the eight catchments. The trends were the strongest in spring and most apparent during the last decade of the study period. The slopes of the trends were generally smaller than the variation in TOC concentration between years and seasons and between catchments. The annual TOC export showed no clear trends and values were largely determined by the temporal variability in runoff. Annual runoff showed a decreasing trend in two of the eight catchments. Mean annual air and stream water temperatures showed increasing trends, most clearly seen in the summer and autumn series. According to our modeling results, stream water temperature, precipitation and peatland percentage were the most important variables explaining annual and most seasonal TOC concentrations. The atmospheric deposition of SO_4, NH_4, and NO_3 decreased significantly over the study period, but no significant link with TOC concentration was found. Precipitation was the main hydrometeorological driver of the TOC export. We concluded that stream water TOC concentrations and exports are mainly driven by catchment characteristics and hydrometeorological factors rather than trends in atmospheric acid deposition.
机译：在芬兰东部的8个森林源头集水区研究了溪流水总有机碳（TOC）浓度和出口的时间趋势。进行了季节性Kendall检验以识别趋势，并使用混合模型回归分析来描述流域特征和水文气象变量（例如降水，空气和溪流水温以及大气沉积）与浓度和出口变化之间的关系。流水TOC。 8个集水区的面积从29公顷到494公顷不等，所包含的泥炭地比例从8％到70％不等。监测径流和TOC浓度15-29年（1979-2006年）。从年度和季节时间序列分析了总有机碳含量的趋势和变化。在八个流域中的七个流域中，平均年度TOC浓度显着增加。该趋势在春季最强，在研究期的最后十年最明显。趋势的斜率通常小于年和季节之间以及流域之间TOC浓度的变化。年度TOC出口量没有明确的趋势，其值主要取决于径流的时间变化。八个流域中有两个流域的年径流量呈下降趋势。年平均空气和溪流水温呈上升趋势，在夏季和秋季系列中最明显。根据我们的模拟结果，溪流水温，降水量和泥炭地百分比是解释年度和大多数季节性TOC浓度的最重要变量。在研究期间，SO_4，NH_4和NO_3的大气沉积显着减少，但未发现与TOC浓度显着相关。降水是TOC出口的主要水文气象驱动因素。我们得出的结论是，溪流中TOC的浓度和出口量主要由流域特征和水文气象因素驱动，而不是由大气酸沉降趋势驱动。

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  • 来源
    《Science of the total environment》 |2009年第1期|92-101|共10页
  • 作者

    Sakari Sarkkola; Harri Koivusalo; Ari Lauren; Pirkko Kortelainen; Tuija Mattsson; Marjo Palviainen; Sirpa Piirainen; Mike Starr; Leena Finer;

  • 作者单位

    Finnish Forest Research Institute, Vantaa Research Unit, P.O. Box 18, FI-01301 Vantaa, Finland;

    Finnish Forest Research Institute, Joensuu Research Unit, P.O. Box 68, FI-80101 Joensuu, Finland;

    Finnish Forest Research Institute, Joensuu Research Unit, P.O. Box 68, FI-80101 Joensuu, Finland;

    Finnish Environment Institute, P.O. Box 140, FI-00251 Helsinki, Finland;

    Finnish Environment Institute, P.O. Box 140, FI-00251 Helsinki, Finland;

    University of Helsinki, Department of Forest Ecology, P.O. Box 27, FI-00014 University of Helsinki, Finland;

    Finnish Forest Research Institute, Joensuu Research Unit, P.O. Box 68, FI-80101 Joensuu, Finland;

    University of Helsinki, Department of Forest Ecology, P.O. Box 27, FI-00014 University of Helsinki, Finland;

    Finnish Forest Research Institute, Joensuu Research Unit, P.O. Box 68, FI-80101 Joensuu, Finland;

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  • 正文语种 eng
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  • 关键词

    catchment; climate change; dissolved organic carbon; export; forest; runoff; peatland;

    机译：集水;气候变化;溶解有机碳出口;森林;径流;泥炭地;

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