Evolution of chronosequential soils derived from volcanic basalt on tropical Leizhou Peninsula,South China

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    Chronosequential soils derived from basalts formed through volcano eruptions during different ages since the Quaternary period from 0.58 Ma to 6.12 Ma BP on Leizhou Peninsula, South China were samples for analysis of changes in some physiochemical properties of the soils. Results show that (1) soil bulk density increased with soil depth and quite closely related to soil age, which suggests that soil bulk density could be deemed, to a certain degree, as an indicator of soil genetic horizons and development; (2) Fed, Fed/Fet, Alo and Alo/Ald, were quite closely related to soil age, as well, suggesting that they are good indicators of soil development and relative age of the soil, while Feo, Ald and Sio were not, suggesting they were not good indicators either; and (3) the common indicators of clay weathering and development, such as Sa (SiO2/Al2O3), Saf (SiO2/ (Al2O3+Fe2O3)), ba ((Na2O+K2O+CaO) / Al2O3), A ((SiO2+CaO+K2O+Na2O) / (Al2O3+CaO+K2O+Na2O)), B ((CaO+K2O+Na2O) / (Al2O3+SiO2+CaO+K2O+Na2O)), WI (\[(2Na2O/0.35) + (MgO/0.9) + (2K2O/0.25) + (CaO/0.7)\]×100), CIW (\[Al2O3/ (Al2O3+CaO+Na2O)\]×100), CIA (\[Al2O3/ (Al2O3+CaO+Na2O+K2O)\]×100) were not significantly related to soil age, suggesting that they are not good indicators of soil weathering degree, while changes in Sa and Saf of clay and migration rate of element Si to a certain extent revealed formation and enrichment of biogenic silica, which may influence Si leaching in soil.

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yangyanfang, lidecheng, zhangganlin, hufeng. Evolution of chronosequential soils derived from volcanic basalt on tropical Leizhou Peninsula, South China[J]. Acta Pedologica Sinica,2010,47(5):817-825.

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  • Received:January 14,2009
  • Revised:November 06,2009
  • Adopted:January 22,2010
  • Online: July 05,2010
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