论文部分内容阅读
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。
Under flooding culture condition, the accumulation release of silicon in 12 different pH paddy soils was studied, and the relationship between the parameters of siliceous release kinetics and soil physico-chemical properties was studied. The results showed that there was an exponential negative correlation between cumulative rate of silicon release and activation of iron oxide (r = 0.6679 *, n = 12) and a positive exponent of gel index (r = 0.6632 *, n = 12) (R = 0.6395 *, n = 12), which was logarithmically negatively correlated with the crystallin ratio (r = 0.6457 *, n = 12). The parameter km for assessing the index of silicon supply for soil showed an exponential negative correlation (r = 0.5950 *, n = 12) with the degree of activation of soil iron oxide, and had a positive power-related relationship with the ratio of crystal gelatin (r = 0.5898 *, n = 12 ). The above results indicate that the release of silicon from different pH paddy soils and the ability of silicon supply are mainly affected by the degree of iron oxide activation.