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本文在盆栽试验条件下,研究了水稻土供钾状况与几个热力学参数的关系。结果表明:土壤钾位势缓冲容量(PBC~k)、平衡活度比(AR_o~k)、钾位(Z)及钾离子在土壤中的扩散系数(D_k)单独使用难以说明水稻土供钾状况,但PBC~k、Z及D~k在衡量水稻土供钾状况时有相互补充的作用。活性钾(-△K_o)能较好地反映水稻土供钾状况。 PBC~k与土壤阳离子交换量(C·E·C)呈显著正相关,因而PBC~k可能与土壤胶体表面的电荷性质及密度有关。
This paper studied the relationship between potassium supply and several thermodynamic parameters in paddy soils under the pot experiment conditions. The results showed that it was difficult to explain the effects of paddy soil potassium buffer capacity (PBC ~ k), equilibrium activity ratio (AR_o ~ k), potassium position (Z) and potassium diffusion coefficient However, PBC ~ k, Z and D ~ k are complementary to each other in measuring the potassium status of paddy soils. Active potassium (- △ K_o) can better reflect the potassium status of paddy soil. PBC ~ k and soil cation exchange capacity (C · E · C) showed a significant positive correlation, so PBC ~ k may be related to soil charge on the nature and density of colloids.