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℃、2 5℃、3 5℃ )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 ,2 5℃和 3 5℃时比 15℃分别增加了 91%和 189% ;同期对P的累积提取量 2 5℃和 3 5℃时比 15℃分别增加了 13 1%和 3 93 % ;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/cm2 ) ,a、b为常数 。
Nutrients (N, P, K, Ca, and Mg) release from paddy soil were studied under diff erent 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 wee ks incubation, N accumulative extraction at 25℃ and 35℃ were 91% and 189% more than that at 15℃, respectively. The P accumulative extraction at the sam e period at 25℃ and 35℃ were 131% and 393% more than that at 15℃, resp ectively. Effect of temperature on the release of K, Ca, and Mg in soil was rela tively small. The dynamics of soil nutrient release was fit to equation RAQ (i,t) =at b (a and b are the constants, RAQ m eans resin adsorption quantity, t means incubation time).
出处
《中国水稻科学》
CAS
CSCD
北大核心
2003年第4期365-368,共4页
Chinese Journal of Rice Science
基金
国际肥料协会 (IPA )资助项目
国际磷钾研究所 (PN )资助项目
国际钾研究所 (LN)资助项目
关键词
离子交换树脂球
温度
养分释放
土壤
水稻
temperature
paddy soil
nutrient release
ion- exchange resin capsule
