Effects of desalinization and plantation on physicochemical characteristics of salinity soil in the mouth region of the Huang He River, China

DOI Web Site 11 References
  • Iyota Akemi
    Fac. of Agric., Tokyo Univ. of Agric. and Technol.:(Present office)Yamagata Pref., Division of Agriculture, Forestry and Fisheries Division
  • Yin Jian Dao
    School of Environmental Science, Tianjin Univ. of Technol.
  • Toda Hiroto
    Fac. of Agric., Tokyo Univ. of Agric. and Technol.
  • Haibara Kikuo
    Fac. of Agric., Tokyo Univ. of Agric. and Technol.
  • Minematsu Hirohiko
    Fac. of Agric., Tokyo Univ. of Agric. and Technol.

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  • 中国黄河河口域における塩類土壌の理化学性に及ぼす脱塩・植栽の影響
  • チュウゴク コウガ カコウイキ ニ オケル エンルイ ドジョウ ノ リカガクセイ ニ オヨボス ダツエン ショクサイ ノ エイキョウ

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Abstract

Physicochemical characteristics of soil were investigated to clarify the effects of desalinization and plantation on salinity soil. Three plantation sites, which were desalinized by irrigation and planted trees 2 to 6 years ago, and two control sites were set in the mouth region of the Huang He River, China. The percentages of the large pores (under pF1.8),total carbon, nitrogen and exchangeable calcium concentration in upper soil (0-30cm)were higher in the plantation sites than in the control sites. In lower soil (30-60cm), soil hardness and pH in the plantation sites were higher than the control sites, and the pH values were over 8.5. The soil in the control sites was categorized into saline-sodic soil because the electric conductivity of saturated water (ECe) was 30-70mS/cm and the exchangeable sodium percentage (ESP) was 20%. In the plantation sites, ECe and ESP were 4mS/cm and 4-8%, respectively. Therefore, sodium was leached by cultivation and irrigation in the upper soil of the plantation sites that had a high rate of percolation. However, the soil pH and hardness increased in the lower soil of the plantation sites. In the plantation sites, the desalinization effect by irrigation was kept for at least 2 to 6 years and soil chemical properties were ameliorated by the low C/N ratio litterfall supply.

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