模拟降雨条件下纳米碳对黄土坡面养分流失的影响

基于野外人工模拟降雨试验,初步研究了90mm/h的降雨强度下,条施不同纳米碳含量(质量含量分别为0,0.01,0.05,0.07,0.10kg/kg)对黄土坡面水分及养分流失调控的影响。结果表明:(1)纳米碳含量对降雨入渗过程及坡面产流量有显著影响,随着纳米碳含量的增大,平均入渗率呈增大趋势,而径流量呈减小趋势。(2)与对照相比较,纳米碳的存在可显著缓解土壤侵蚀。纳米碳的质量比为0.01,0.05,0.07,0.10kg/kg的小区可分别降低坡面径流量40%,41%,68%和74%,降低坡面产沙量为27%,50%,68%和79%。(3)条施纳米碳可以有效保持黄土坡面土壤养分含量。与对照组相比较,纳米碳的质量比为0.01,0.05,0.07,0.10kg/kg的小区分别降低径流氮的流失量为47%,52%,74%和79%,降低泥沙氮的流失量为10%,60%,74%,87%;分别降低径流磷的流失量为63%,63%,88%和86%,降低泥沙磷的流失量为29%,56%,86%,83%;分别降低径流钾的流失量为43%,46%,81%和83%,降低泥沙钾的流失量为25%,62%,78%,87%。

Effects of Nano Carbon on Nutrient Loss of Loess Slope Under Simulated Rainfall

Based on field simulated rainfall experiments, the study preliminarily investigated the effects of water and nutrient loss on loess slope with drill fertilization of different nano carbon contents (0 kg/kg, 0.01 kg/kg, 0.05 kg/kg, 0.07 kg/kg, 0.10 kg/kg) under 90 mm/h rainfall intensity. The results showed that: (1) The nano carbon had a significant influence on the rainfall infiltration process and the slope runoff amount. With the increasing content of nano carbon, the average infiltration rate tended to increase, and the runoff tended to decrease. (2) Compared with the control treatment, nano carbon could significantly alleviate soil erosion. The plots with 0.01 kg/kg, 0.05 kg/kg, 0.07 kg/kg and 0.10 kg/kg nano carbon reduced runoff amount on slope by 40%, 41%, 68% and 74%, respectively, and reduced sediment yield on slope by 27%, 50%, 68% and 79%, respectively. (3) Drill fertilization of nano carbon could effectively maintain the soil nutrient content on the loess slope, and compared with control treatment, the plots of 0.01 kg/kg, 0.05 kg/kg, 0.07 kg/kg and 0.10 kg/kg nano carbon reduced the loss of nitrogen in runoff by 47%, 52%, 74% and 79%, respectively, reduced the loss of nitrogen in sediment by 47%, 52%, 74% and 79%, respectively, reduced the loss of phosphorus in runoff by 63%, 63%, 88% and 86%, respectively, reduced the loss of phosphorus in sediment by 29%, 56%, 86% and 83%, respectively, reduced the loss of potassium in runoff by 43%, 46%, 81% and 83%, respectively, and reduced the loss of potassium in sediment by 25%, 62%, 78% and 87%, respectively.