论文部分内容阅读
试验采用人工模拟降雨装置,研究了紫色土在表施肥和混施肥两种施肥方式下磷、钾养分径流流失规律.结果表明,两种施肥方式径流中养分浓度均随时间呈幂函数下降,但表施肥径流中磷钾养分含量明显高于混施肥,且在降雨产流初期表现尤为明显;在养分流失量方面,两种施肥方式径流中可溶性P及速效K累积流失量均随时间呈近似直线增加,表施肥明显大于混施肥,但混施肥养分流失50%～70%在开始降雨产流的前10 min内发生,而表施肥养分流失贯穿整个产流过程.同时试验发现施肥方式对坡面产流无显著影响.
In the experiment, rainfall and artificial rainfall devices were used to study the runoff loss of phosphorus and potassium in purple soil under the two fertilization modes of table fertilization and mixed fertilization.The results showed that nutrient concentrations of runoff in both fertilization ways decreased with power function over time, The nutrient contents of phosphorus and potassium in table fertilization runoff were significantly higher than those in mixed fertilization, especially during the initial period of rainfall and runoff. In terms of nutrient loss, the cumulative losses of soluble P and available K in runoff of the two methods were almost linear with time Increase, table fertilization was significantly larger than the mixed fertilizer, but mixed fertilizer nutrient loss of 50% to 70% occurred in the first 10 min of rainfall runoff occurs, while the table fertilization nutrient run through the entire runoff process.At the same time, the experiment found that fertilization on the slope No significant effect on runoff.