ZHANG Yong-kun, WU Yuan-zhi, YU Xing-xiu. Physical Properties of Soils Developed from Different Parent Rocks in Yimeng Mountainous Region[J]. Bulletin of Soiland Water Conservation, 2014, 33(5): 34-38.
DOI:
ZHANG Yong-kun, WU Yuan-zhi, YU Xing-xiu. Physical Properties of Soils Developed from Different Parent Rocks in Yimeng Mountainous Region[J]. Bulletin of Soiland Water Conservation, 2014, 33(5): 34-38. DOI: 10.13961/j.cnki.stbctb.2014.05.014.
Physical Properties of Soils Developed from Different Parent Rocks in Yimeng Mountainous Region
A comparative analysis of soil physical properties and their influencing factors was carried out between soils developed from either acidic and calcareous rocks in Xiaoshengtang small watershed in the Yimeng mountainous region. The results showed that:(1) The soils developed from acidic rocks contained more gravel and sand than those from calcareous rocks. Soil textures ranged from sandy loam to loamy sand
and the gravel content increased with soil depth. The silt and clay contents of the soils were slightly higher in soils developed from calcareous rocks than from acidic rocks. However
the particle size compositions of the upper and lower soil layers were similar for soils from the calcareous rocks. Both soil types had relatively low fractal dimensions
which were influenced by the parent rock
but those of the soils developed from acidic rock were lower. Furthermore
they were both poorly developed soils with gravel contents higher than 10%.(2) Soils developed from acidic rock had higher bulk densities than that from calcareous rocks
which had higher total and capillary porosities. The bulk densities and capillary porosities of the two soils increased with increasing soil depth and
conversely
the total porosities and non-capillary porosities decreased. Furthermore
the capillary porosities were mainly influenced by soil fractal dimensions.(3) The saturated hydraulic conductivities of the soils developed from acidic rock were higher than those from calcareous rock
and they were higher in the 10-20 cm soil layer than in the 0-10 cm layer. However
the saturated hydraulic conductivities of the soils developed from calcareous rock did not exhibit consistent changes in different soil layers. Soil texture
especially the sand and silt contents
was the main influencing factor of soil saturated hydraulic conductivity in the Yimeng mountainous region.
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