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《Journal of Agro-environmental Science》 2004-03
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New Method for Evaluating Buffering Capacity and Equilibrium pH of Paddy Soil with Simulation Parameter

CHENG Jie min1,3, HU Guang lu2, PAN Gen xing3(1.College of Population, Resources and Environmental Science, Shandong Normal University, Jinan 250014,China;2.Department of Information Engineer, Shandong Youth Administrative Cadres College, Jinan 250014,China;3.College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095,China)  
A method for evaluating acidic sensitivity of soils was studied in this investigation. The changes of acid buffering capacity of three typical paddy soils (Hydragric paddy soil, Bleached paddy soil and Gleyed paddy soil) from the Tai Lake region, China, were analyzed under simulated acidification with acid rain (pH values 5.6, 4.0, 3.0 and 2.0). The parameters for estimating acidic sensitivity of soils were statistically gained by using the titration curve of acid and alkali. The results indicated that acid buffering capacities of hydagric paddy soil, gleyed paddy soil, and bleached paddy soil were 3.25, 3.0 and 1.58, respectively. The steep change of pH in the titration curve of each soil was best linearly fitted by the amount of acid addition after 70 days. The higher absolute value of slope was the soil with less acidic buffering capacity. The ratio of the slope before leach and the slope after leach may be used to estimate the change of acidic buffering capacity of a soil under acidification. The higher or lower ratio( K100% or K100% =indicated the more intense change of the buffer capacity to acid and alkali. The more approached to 100% (≤ ± 5% ) the value( K) was, the smaller the buffer capacity to acid and alkali changed. Because the new method was based on the theory of titration curve of acid and alkali of the soil, it could be used only in the system of cation exchange reaction in soil.
【Fund】: 国家自然科学基金(D40271068);; 山东省自然科学基金(Y2002E02)
【CateGory Index】: S153
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