【摘要】 选用二种电场强度（44．4V／cm和88．8V／cm）研究20个低丘红壤玉米田间试验的钾释放速率特性，用二级动力学方程来表征，并求得土壤钾释放的速率方程和钾释放的初始速率（v0）等参数。在电场强度为44.4V／cm和88.8V／cm下供试土壤的v0变幅分别在1．17-1．23和1．93-61．58mg／（kg·min）之间，平均值分别为5．36和9．54mg／（kg·min）。统计结果表明：在电场强度为44.4V／cm下，v0与玉米籽粒相对产量、总干物质相对产量、无钾处理玉米吸钾量、土壤速效钾、酸溶性钾和缓效钾6项参比标准之间的相关性均达极显著水平（p=0.01），相关系数分别为0.6275**、0.5645**、0.6624**、0．7277**、0.7843**和0．6299**。而在电场强度为88．SV／cm下，v0除了与玉米总干物质相对产量之间达显著相关水平（P＝0.05，=0．5445*）外，v0与其余5项参比标准之间均达极显著相关水平，相关系数分别为0．6064**，0.7216**，0.7523**，0.8202**和0．6686**。V0能很好地用于评价土壤供钾能力以及钾素肥力诊断指标的划分。更多还原

【Abstract】 Potassitun release rate characteristcs of twenty low-hilly red soils under electricfield strength of 44.4 V / cm and 88.8 V/cm were described with a second-orderkinetic equation. The rate equstions of K release and the initial K release rates (v0)were calculated from the second-order equations. The values of v0 ranged from 1.17to 21.23 and from 1.93 to 61-58, with an average of 5.36 and 9.54 mg(kg. min) -1at the electric field strength of 44.4 and 88.8 V / cm, resPectively. The relative grainyield,relative total dry matter yield and K uptake in NP PlotS of 2O corm experimentsand the available K, HNO3-soluble K and slowly available K of soils were used asreference standards to assess the Pracal aPPlicability of v0, The correlation analysisshowed that v0 was very significantly correlated (p = O.O1) with the above sixreference standards, with the correlation coefficients of 0.6275", 0-5645", 0.6624",0.7277",0.7843" and 0.6299",respectively, at electric field strength of 44.4V/cm. v0was significantly correlated with relative total dry matter yield (p = 0.05, r = 0.5445")and very significantly correlated with the other five reference standards, with thecorrelation coefficients of 0.6064", 0.7216", 0.7523", 0.82O2" and 0.6686", respectively,at the field strength of 88.8V / cm. It was suggested that v0 could be used to estimatethe suPPlying poWer of soil K and to characterize K status in soils.更多还原