Study on soil moisture variation in forests for soil and water conservation in the China Loess Plateau

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  • Zhang Jianjun
    College of Soil and Water Conservation, Beijing Forestry University (BJFU):JSPS Postdoctoral Researcher:Department of Soil and Water Conservation, Forestry and Forest Products Research Institute (FFPRI)
  • Shimizu Akira
    Department of Soil and Water Conservation, Forestry and Forest Products Research Institute (FFPRI)

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  • 黄土高原水土保全林地の土壌水分動態に関する研究
  • オウド コウゲンスイド ホゼン リンチ ノ ドジョウ スイブン ドウタイ ニ カンスル ケンキュウ

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Abstract

Soil moisture variation in forests for soil and water conservation in the China Loess Plateau was investigated. Based on the result, annual change of soil moisture content can be divided into four periods, consuming period, increase period, decrease period, and steady period, respectively. Soil moisture contents of ruderal land and shrubbery land are 20mm more than that of arbor stand. The soil moisture content of the slope arbor stand facing to south keeps under 60% of field moisture capacity in most months yearly; while the bottom of valley keeps above 60% of field moisture capacity all year round. On average, the frequencies that the soil moisture content is under 60% of field moisture capacity were ranked as: the mixture forest stand of Robinia pseudoacacia and Pinus tabulaeformis (96%), Pinus tabulaeformis forest stand (88-94%), Robinia pseudoacacia forest stand (78-95%), shrubbery land (50-58%), and ruderal land (23-42%). Results suggest that it is better to plant trees in the bottom of valley and to plant the species with low level of water-consuming such as Ostryopsis davidiana in the China Loess Plateau area in order to form naturally regenerated forests, which not only consumes small amount of soil water but also can prevent soil erosion.

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