施用不同比例缓释肥对农林复合系统地表径流氮磷流失过程的影响

The Influence of Application of Slow-release Fertilizer in Different Proportions on Nitrogen and Phosphorus Loss and Runoff of Agroforestry Systems

试验通过在滇池流域桃树/大豆间作模式中施用不同比例的缓释肥作为处理,研究了不同缓释肥施肥比例[处理Ⅰ(2/3缓释肥+1/3复合肥)、处理Ⅱ(全部施用缓释肥)、对照(全部施用复合肥)]对桃树/大豆间作模式的径流、泥沙流失量和径流中氮磷流失过程的影响。结果表明:在桃树/大豆间作模式中,与对照相比,施用不同比例的缓释肥显著地降低了径流中氮磷的浓度和氮磷流失总量中泥沙所占的比例;3种处理条件流失过程相似,均表现为初期增大中期减小后期趋于稳定的状态;与对照(CK)相比,处理Ⅰ与处理Ⅱ的径流流失量分别削减了8.15%和23.60%,泥沙流失量分别削减了5.25%和18.55%。说明在桃树/大豆间作模式下,施用缓释肥对于径流流失、泥沙流失和氮磷养分流失均具有较好的控制效果。

Applying different proportions of slow-release fertilizer in peach tree / soybean intercropping mode as a processing,the application of slow-release fertilizer in different proportions on sediment loss and runoff,nitrogen and phosphorus losses from peach tree / soybean intercropping mode were studied.The results showed that： in the peach / soybean intercropping model,compared with controls,application of slow-release fertilizer significantly reduced the concentration of nitrogen and phosphorus in runoff,and reduced the amount of sediment in the proportion of loss of nitrogen and phosphorus. In terms of the loss of the process,changes in the performance of the three treatments were expressed as increase in the early,decreased in the mid and late stabilized. Compared with the CK,the amount runoff and loss of treatment Ⅰ and Ⅱ were reduced by 8. 15% and 23. 60%,sediment loss of treatmentⅠ and Ⅱ were reduced by 5. 25% and 18. 55%. So in the peach /soybean intercropping patterns,application of slow-release fertilizer can effectively control the runoff erosion,sediment erosion and loss ofnitrogen and phosphorus.