摘要
在淹水培养条件下,进行了12种不同pH水稻土硅素累积释放试验,研究了硅素释放动力学方程参数与土壤理化性质间的关系。结果表明:硅素累积释放速率常数与土壤氧化铁活化度呈指数负相关关系(r=0.6679*,n=12),与晶胶比呈幂指数正相关关系(r=0.6632*,n=12);硅素累积释放速率变化系数与土壤氧化铁活化度呈线性正相关关系(r=0.6395*,n=12),与晶胶比呈对数负相关关系(r=0.6457*,n=12);评价土壤供硅能力指标的参数km与土壤氧化铁活化度呈指数负相关关系(r=0.5950*,n=12),与晶胶比呈幂函数正相关关系(r=0.5898*,n=12)。上述结果说明不同pH水稻土释放硅的过程和土壤供硅能力主要受土壤氧化铁活化程度的影响。
Twelve paddy soils with different pH values were selected for the incubation experiments, and the relation between the parameters of silicon liberation dynamics equation and properties of paddy soils were studied. The results showed that the Si liberated from soil could be expressed by a one-order reaction dynamics equation y=kxm. There were exponential negative correlations between parameter k and Feo/Fed （r=0.6679^＊ ,n=12）, and power function positive correlations between k and （Fed-Feo）/Feo （r=0.6632^＊,n=12）. There were linear positive correlations between parameter m and Feo/Fed （r=-0.6395^＊,n=12）, and logarithmic negative correlations between km and （Fed-Feo）/Feo （r=-0.6457^＊, n=12）. There were exponential negative correlations between parameter and Feo/Fed （r=-0.5950^＊,n=12）, and power function positive correlations between km and （Fed-Feo）/Feo （r=0.5898^＊,n=12）. Based on these results, it could be concluded that the silicon liberation dynamics and the silicon supplying capacity in paddy soils affected by the level of activation of iron oxide.
出处
《土壤通报》
CAS
CSCD
北大核心
2009年第2期344-346,共3页
Chinese Journal of Soil Science
基金
辽宁省自然科学基金(971068)
辽宁省博士启动基金(20031051)资助
关键词
动力学方程
参数
水稻土
供硅能力
氧化铁活化度
晶胶比
Dynamics equation
Parameter
Paddy soil
Silicon supplying capacity
Feo/Fed
（Fed-Feo）/Fe
