RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (07): 1192-1199.doi: 10.11870/cjlyzyyhj201507016

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SPATAIL VARIABILITY OF SOIL pH AND ITS INFLUENCE FACTORS AT A COUNTY SCALE IN HILLY AREA OF MID-SICHUAN BASIN——A CASE STUDY FROM RENSHOU IN SICHUAN

ZHANG Wei, LI Qi-quan, WANG Chang-quan, YUAN Da-gang, LOU You-lin, ZHANG Xin, JIA Li   

  1. Resources and Environment College of Sichuan Agriculture University, Chengdu 611130, China
  • Received:2014-06-20 Revised:2014-08-30 Online:2015-07-20
  • Contact: 王昌全,E-mail:w.changquan@163.com E-mail:w.changquan@163.com

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Abstract: Based on 555 topsoil samples (0-20 cm) collected from the Renshou county of Sichuan Province in 2012, spatial variability of topsoil pH at the county scale in the hilly area of Mid-Sichuan Basin was analyzed using geo-statistics, while variance analysis and regression analysis were employed to quantify the extent of impact of the main factors on soil pH variability. Results show that soil pH values in the study area range from 4.02 to 8.14, with an average of 6.80. Overall, 41.08% and 32.07% of soil samples are neutral and alkaline soils, respectively. Coefficient of variation is 14.48%, indicateing a moderate spatial variability. Geostatistical analysis showed that the best theoretical model is the spherical model with a nugget/sill ratio of 0.302, suggesting that soil pH has a moderate spatial dependence, and structural factors play a dominant role while random factors also have an impact on spatial variability of soil pH in the study area. The range is 52.7 km, suggesting soil pH has a large range of spatial autocorrelation. Variance analysis shows that land use type, soil type and parent material have significant impacts on soil pH. Land use type and soil parent materials are able to explain 4.8% and 76.2% of the spatial variability of soil pH, respectively. The explanatory power of soil type is related with soil classification. Soils in lower soil categories of the soil classification are more capable of explaining the spatial variability of soil pH. Soil group and soil subgroup are able to independently explain 41.3% and 57.3% of soil pH variability respectively, while soil genus independently explain 83.7% because soil genus is classified based on both soil-forming process and characteristics of parent materials which have a great effect on soil pH. Therefore, it is advisable to use soil genus as main influencing factors in predicting and assessing spatial distribution of soil pH value at the county scale in the hilly area of Mid-Sichuan Basin. This result provides useful information for management and construction of ecological environment for the study area.

Key words: soil pH value, spatial variability, geostatistical analysis, factors, in Mid-Sichuan hilly region

CLC Number: 

  • S153.4
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