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Quantitative Study on the Correlation between the Depth of Calcic Horizon in Soil and Annual Precipitation in China

PAN Yuan-yuan et al(Department of Environmental Science and Engineering,Sichuan University,Chengdu,Sichuan 610065)  
Based on the previously reports at home and abroad,the prior conditions for the function relation between the depth of calcium horizon in soil and annual mean precipitation were summarized.And different calcium soils in China were deeply studied.48 soil profiles were screened out.The function relational expression between the depth x(cm) of new soil calcium horizon in regions of China and annual mean precipitation y(mm) was established:y=-0.069 3x2 + 12.063 0x + 68.499 0,R2 = 0.725 4(n=48).This relationship may be used to derive paleoprecipitation from paleosols,and provide more exact and credible data for studies in paleosols and paleoclimate quantificational reconstruction.
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