中国黄土高原における熱収支と土壌水分 Heat Balance and Soil Moisture in the Loess Plateau, China

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Abstract

中国黄土高原での熱収支と土壌水分特性を明らかにするために,土壌3層モデルを用い,実際の裸地圃場に適用した(鳥取砂丘および中国陝西省神木県)。日蒸発量の観測値と計算値の差は0.18 mm(5 W m<sup>-2</sup>)から0.21 mm(6 W m<sup>-2</sup>)程度であった。神木地区の黄土は砂,シルト,粘土が適度に混ざり合っていることにより,保水性の効果と蒸発抑制効果の両面を併せ持っていた。神木に近い楡林の1999年の気象データを用い,熱収支と土壌水分の季節変化について考察した。年平均顕熱フラックスは23 W m<sup>-2</sup>,年平均潜熱フラックスは19 W m<sup>-2</sup>(239 mm per year)であった。冬季の第2層と3層の土壌水分は比較的高く維持されていた。

A three-layer soil model was used for clarifying the heat balance and soil water content in the Loess Plateau, China, and applied to actual bare soil fields (Tottori Sand Dune and Shenmu District, Shaanxi Province, China). The difference between the observed and calculated evaporation per day was approximately 0.18 mm (5 W m<sup>-2</sup>) to 0.21 mm (6 W m<sup>-2</sup>). Because of its moderate mixture of sand, silt and clay, yellow loessial soil in Shenmu affects water retentivity and restriction of evaporation from the soil surface. The seasonal change of heat balance and soil water content was examined using meteorological data in Yulin near Shenmu. The annual means of sensible heat and latent heat flux were 23 W m<sup>-2</sup> and 19 W m<sup>-2</sup> (239 mm per year), respectively. The soil water content of the second and third layers remained comparatively high in winter.

Journal

  • Journal of Agricultural Meteorology

    Journal of Agricultural Meteorology 60(2), 103-113, 2004-06-10

    The Society of Agricultural Meteorology of Japan

References:  16

Codes

  • NII Article ID (NAID)
    10029868574
  • NII NACSIS-CAT ID (NCID)
    AN00200732
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00218588
  • NDL Article ID
    7005261
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z18-388
  • Data Source
    CJP  NDL  J-STAGE  JASI 
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