積雪および融雪を勘案した灰色低地土リンゴ園における無機態窒素の浸透流出特性  [in Japanese] Consideration of Snow Cover and Snowmelt upon the Inorganic Nitrogen Leaching Characteristics of an Apple Orchard in a Gray Lowland Soil  [in Japanese]

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Author(s)

    • 遠藤 明 ENDO Akira
    • 弘前大学農学生命科学部 Faculty of Agriculture and Life Science, Hirosaki University
    • 伊藤 大雄 ITO Daiyu
    • 弘前大学農学生命科学部附属生物共生教育研究センター Teaching and Research Center for Bio-coexistence, Faculty of Agriculture and Life Science, Hirosaki University
    • 加藤 幸 KATO Koh
    • 弘前大学農学生命科学部 Faculty of Agriculture and Life Science, Hirosaki University

Abstract

青森県津軽地域の灰色低地土リンゴ園を対象に, 積雪と融雪を勘案した上で, 土壌中の無機態窒素濃度の時空間的動態について有限要素法汎用ソルバーを用いることで数値解析的に把握し, 青森県内のリンゴ栽培における秋肥の必要性を検討した.NO<sub>3</sub>-Nの最大濃度を示す深さの進行速度(Δ<i>z</i>/Δ<i>t</i>)に着目したところ, 積雪による降水の地表面貯留と融雪を考慮した場合は100~130cm/monthであり, 考慮しない場合の20~26cm/monthと比較して4~5倍程度速いことが推定された.以上のことから, 環境保全の推進ならびに環境負荷低減の視点より, 冬期における土壌水分移動の重要性が数値計算によって定量されたことを受け, 春先における融雪水の浸透を勘案した上で, 土壌間隙水のNO<sub>3</sub>-Nの挙動や窒素収支に関する議論を行う必要性が示された.

The authors estimated spatiotemporal dynamics of inorganic nitrogen concentration of pore water in Apple orchard of Gray lowland soil in Tsugaru region, Aomori prefecture by numerical analysis with FEM solver, taking snow cover and snowmelt into account. Under non-consideration condition of snow cover and snowmelt, it was indicated that the traveling velocity (Δ<i>z</i>/Δ<i>t</i>) of the NO<sub>3</sub>-N concentration peak reached to a depth of 100 cm (Δ<i>z</i>/Δ<i>t</i> = 20-26 cm/month) in about 4 months from late November to the early March of the following year. On the other hand, considering snow cover and snowmelt, it was indicated that the high concentration of NO<sub>3</sub>-N reached to the depth of 100 cm (Δ<i>z</i>/Δ<i>t</i> = 100-130 cm/month) in just one month from early March to early April. Consequently, from the perspective of promoting environmental conservation and reducing the environmental load, the importance of soil moisture transfer during winter season was quantified by numerical analysis. Thus, it was necessary to discuss the behavior of NO<sub>3</sub>-N in soil pore water and the nitrogen budget, taking into consideration the snowmelt water from the soil surface in early spring.

Journal

  • Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 85(2), I_221-I_231, 2017

    The Japanese Society of Irrigation, Drainage and Rural Engineering

Codes

  • NII Article ID (NAID)
    130006195424
  • NII NACSIS-CAT ID (NCID)
    AA12240517
  • Text Lang
    JPN
  • ISSN
    1882-2789
  • NDL Article ID
    028799437
  • NDL Call No.
    Z18-365
  • Data Source
    NDL  J-STAGE 
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