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首页> 外文期刊>Limnology >Vertical profiles of DIN, DOC, and microbial activities in the wetland soil of Kushiro Mire, northeastern Japan
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Vertical profiles of DIN, DOC, and microbial activities in the wetland soil of Kushiro Mire, northeastern Japan

机译：日本东北Ku路湿地湿地土壤中DIN，DOC和微生物活动的垂直剖面

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摘要

Kushiro Mire is the largest mire in Japan and in 1980 was the first wetland in Japan registered under the Ramsar Convention. Recent reports indicate an increase in nutrient loading into Kushiro Mire from changes in land use. We measured vertical profiles of dissolved inorganic nitrogen (DIN; NO3 –, NO2 –, NH4 +), dissolved organic carbon (DOC), and various types of microbial activity in soil samples collected to approximately 1.5 m deep at two sites in Kushiro Mire. We found an accumulation of NO3 – and DOC in the deeper soil. Denitrifying activity was highest in the shallower soils and decreased drastically with depth, whereas higher levels of fluoresceindiacetate hydrolysis, β-glucosidase, acid phosphatase, and xylosidase enzyme activity were found in the deeper layers. We also detected humic-like substances as components of the DOC. These results suggest that the DOC in the wetland soil cannot be used as a substrate for denitrification, causing denitrification to be suppressed in the deeper soil. In addition, denitrifying activity would be very low in the deeper layers due to low soil temperature. As a result, nitrogen input to the mire has resulted in a large accumulation of NO3 – in the deeper soil. This will eventually change the mire ecosystem through effects such as increased eutrophication and acidification.
机译：s路沼泽是日本最大的沼泽，1980年是日本根据《拉姆萨尔公约》注册的第一座湿地。最近的报告表明，土地利用方式的变化使Ku路沼泽的养分含量增加。我们测量了溶解无机氮（DIN； NO3 – ，NO2 – ，NH4 + ），溶解有机碳（DOC）的垂直剖面），并在Ku路沼泽的两个地点采集到约1.5 m深的土壤样品中的各种微生物活性。在更深的土壤中发现了NO3 – 和DOC的积累。在较浅的土壤中反硝化活性最高，随深度的增加反硝化活性急剧下降，而在较深的土壤层中发现较高水平的荧光素二乙酸酯水解，β-葡萄糖苷酶，酸性磷酸酶和木糖苷酶活性。我们还检测到腐殖质样物质作为DOC的成分。这些结果表明，湿地土壤中的DOC不能用作反硝化的底物，导致在较深土壤中反硝化被抑制。此外，由于土壤温度低，深层反硝化活性非常低。结果，向泥潭中输入的氮已导致NO3 – 在较深的土壤中大量积累。这最终将通过富营养化和酸化等作用改变泥潭生态系统。

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  • 来源
    《Limnology》 |2011年第1期|p.17-23|共7页
  • 作者

    Yukiko Senga; Mikiya Hiroki; Yosuke Nakamura; Yasushi Watarai; Yasunori Watanabe; Seiichi Nohara;

  • 作者单位

    Department of Environment Systems, Faculty of Geo-Environmental Science, Rissho University, 1700 Magechi, Kumagaya, Saitama, 360-0194, Japan;

    Department of Environment Systems, Faculty of Geo-Environmental Science, Rissho University, 1700 Magechi, Kumagaya, Saitama, 360-0194, Japan;

    Department of Environment Systems, Faculty of Geo-Environmental Science, Rissho University, 1700 Magechi, Kumagaya, Saitama, 360-0194, Japan;

    Department of Environment Systems, Faculty of Geo-Environmental Science, Rissho University, 1700 Magechi, Kumagaya, Saitama, 360-0194, Japan;

    Department of Environment Systems, Faculty of Geo-Environmental Science, Rissho University, 1700 Magechi, Kumagaya, Saitama, 360-0194, Japan;

    National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan;

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  • 正文语种 eng
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  • 关键词

    Nitrate; Denitrification; Humic substance; DOC; Mire;

    机译：硝酸盐;反硝化;腐殖质;DOC;Mire;

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