CLIMATIC CONTROL OF SOIL ACIDITY IN THE B HORIZON OF UNITED STATES SOILS

Autor:	Michael E. Folkoff
Rok vydání:	1987
Předmět:	Hydrology Atmospheric Science Soil test Pedalfer Soil morphology Soil science Soil type Leaching model Pedotransfer function Earth and Planetary Sciences (miscellaneous) Cation-exchange capacity General Earth and Planetary Sciences Environmental science Soil fertility General Environmental Science
Zdroj:	Physical Geography. 8:82-97
ISSN:	1930-0557 0272-3646
DOI:	10.1080/02723646.1987.10642313
Popis:	Soil acidity was sampled for the B horizon of 53 United States soils and compared with climatic variables, including soil water balance variables, and soil texture variables. Simple correlations indicated that B horizon pH (pHB) varied mainly with the gradients in climatic moisture. A model based on average annual precipitation had the highest R2 = (0.77) although a model based on a logarithmically transformed index of soil leaching rates was nearly as good (R2 = 0.75) and is better supported by current theories of pH evolution. Geochemical theory suggests that soil pH is determined by soil equilibria conditions through their control over clay mineral genesis and soil buffering capacities. Soil leaching regulates pH because it determines the soil ionic activities which control soil equilibria. Attempts to include the influence of environmental energy and soil texture in this model did little to improve the explanatory power above that of leaching. Thus, the model pHB = 12.91 – 1.234 In(LI) is supported by...
Databáze:	OpenAIRE
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