Гранулометрический состав почв заповедника «Ханкайский» (Приморский край)

Abstract

Soil texture is determined and the features of particle-size vertical distribution in soils of different landscapes of the Khankaiskiy Nature Reserve are considered. Three variants of the distribution of clay (<0.001 mm) and physical clay (<0.01 mm) fractions along the vertical profiles soils are identified: accumulative, regressive, with a maximum in the middle-profile horizon and with their approximately equal contents in the upper and the lower horizons. A regressive variant is revealed in burozems gleyic, podzoliс-brownzems, dark-humus gley and alluvial meadow gley soils. These soils are characterized by a medium loamy sandy-coarse-dusty composition of the upper horizons and a light- or medium-loamy composition of the middle and lower parts of the profile. The distribution of fine fractions along the profile is observed with a gradual decrease in their content with depth in typical burozems and alluvial meadow gley-ic soils, while the texture of the layer changes from medium loamy to light loamy. The vertical distribution of fine fractions with a maximum in the middle part of the profile is revealed in mucky gley soils. The profile is formed under the influence of a combination of the floodplain process with the introduction and redeposition of suspended particles and gleying. The lithological specificity of the accumulation of the initial parent materials plays a decisive role in the differentiation of fine fractions in the soil profile.