1.The Institute of Hydrogeology and Environmental Geology; CAGS; Shijiazhuang 050061, China 2.Department of Geology, Northwest University, Xi 'an 710069, China 3.School of Environment Studies, China University of Geosciences, Wuhan 430074, China
From the perspective of application of paleoclimatology, the evolution law of potassium in soil with long time scale climate change is discussed quantitatively and the main conclusions are as follows.The relationship of the content of available potassium and slowly available potassium and the annual precipitation or the annual temperature obey the exponential function model.The fitting equations of potassium effectiveness and the annual precipitation or the annual temperature accord with the parabolic function model.There is a critical value, only the average temperature(over 9.5°C)or the annual precipitation(over 577.3mm), and its effectiveness presents obviously a progressive increase with the increase of the annual precipitation or the annual temperature.The fitting relationship of the content of available potassium and slowly available potassium, potassium effectiveness and paleoclimatic coupling conditions comply with the Cobd-Douglas equations.
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doi: 10.1097/00005650-196711000-00012
pmid: 5713170
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