Abstract: Nutrients (N, P, K, Ca, and Mg) release from paddy soil were studied under different temperatures(15℃, 25℃, 35℃ ) by using UNIBEST(the universal bioavailabi lity environment/test) ion-exchange resin method. Results showed that the rele ase of N, P significantly increased with temperature increased. During seven weeks incubation, N accumulative extraction at 25℃ and 35℃ were 91% and 189% more than that at 15℃, respectively. The P accumulative extraction at the same period at 25℃ and 35℃ were 131% and 393% more than that at 15℃, respectively. Effect of temperature on the release of K, Ca, and Mg in soil was relatively small. The dynamics of soil nutrient release was fit to equation RAQ_(i,t) =at^b (a and b are the constants, RAQ means resin adsorption quantity, t means incubation time).

Key words: temperature, paddy soil, nutrient release, ion-exchange resin capsule

摘要： 采用”通用佳”离子交换树脂球法研究了3种不同温度下（15℃、25℃、35℃）淹水土壤氮、磷、钾、钙、镁等养分释放的动态规律。结果表明，温度升高对土壤氮和磷释放有明显的促进作用。7周内离子交换树脂对N的累积提取量，25℃和35℃时比15℃分别增加了91%和189％；同期对P的累积提取量25℃和35℃时比15℃分别增加了131%和393％；温度对土壤钾钙镁释放的影响相对较小。不同温度下土壤养分释放动态适合于乘幂方程RAQ（i,t）=atb，其中，RAQ（i,t）表示树脂球t天内所吸收的i养分离子量(μmol/cm[sup]2[/sup])，a、b为常数，t为培养时间。

关键词: 温度, 水稻土, 养分释放, 离子交换树脂球