Nitrogen and phosphorus dynamics at plant soil ecosystems of Ozegahara mire under impacts of floodings

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  • 洪水影響下の尾瀬ヶ原湿原生態系の窒素・リン動態
  • コウズイ エイキョウ カ ノ オゼガハラ シツゲン セイタイケイ ノ チッソ ・ リン ドウタイ

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Abstract

As a part of the 4th Scientific Research the Oze mire, nitrogen and phosphorus dynamics of the soil-plants systems were studied at a number of selected survey sites of Ozegahara (July 2017-August 2019). Wet hollow mire and fen dich under the impacts of flooding were characterized by abundant occurrence of Myrica gale var. tomentosa in association with plentiful available phosphorous in the soils. Transect survey through many mire sites at the bank-hollow complex indicated significant correlations among NO3- concentration, denitrification activity, redox-potential, and water level in the soil. We also found a significant correlation between nitrogen fixation activity and stem height of the Myrica at Shimotashiro mire. Abundant occurrence of phosphorus in the soils at mire hollows closing to the rivers was regarded to be caused by flood associated external supply of phosphorus. Analysis of nitrogen transfer through plants and soil ecosystems at 12 survey sites indicated almost balanced nitrogen cycles through soil-plant ecosystem started by leaf production followed by mineralization of fallen leaves, microbial nitrogen fixation and denitrification at soil system, nitrogen fixation at root nodules of the Myrica and nitrogen returning to leaf production at respective ecosystem under external input of nitrogen by falling rain. Further detailed studies are needed on the effects of external supply of nitrogen by flooding on production of Myrica gale and other plants as wall as nitrogen cycle through plants soil ecosystem at Ozegahara.

Journal

  • 低温科学

    低温科学 80 577-590, 2022-03-31

    低温科学第80巻編集委員会

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