氮掺杂碳纳米粒子对红壤中氮损失及盐基离子的影响

采用室内模拟装置淋溶土柱的方法,研究了氮掺杂碳纳米粒子(N-CNPs)配施尿素对红壤中尿素氮损失和土壤盐基离子的影响。结果表明:N-CNPs伴随尿素施入红壤后,在p H4.38的模拟酸雨多次淋溶条件下,能显著降低红壤氮素损失率;氮素损失率与N-CNPs的施用量呈正相关,15‰N-CNPs配施尿素处理总氮损失率仅为单施尿素处理的49.45%;5‰N-CNPs用量所表现出的氮素损失率与5%双氰胺(DCD)处理结果相近。N-CNPs施用后,土壤交换性阳离子淋失量降低,具体表现为Ca2+Mg2+Na+K+,p H值和盐基饱和度(BS)升高,且与N-CNPs用量呈显著正相关(P0.05)。这些结果表明,土壤p H值和BS的改善可能是N-CNPs施用于红壤后引起土壤氮素淋失降低的原因之一。

Effect of adding nitrogen-doped carbon nanoparticles(N-CNPs) on soil nitrogen loss and base irons in red soil

Indoor simulated leaching approach of soil column was used to study effects of nitrogen-doped carbon nanoparticles(N-CNPs) with urea on nitrogen loss and base irons from red soils. The results showed that the rate of nitrogen loss decreased with the increased of N-CNPs after the red soils were leached with simulated acid rain 4.38 in pH, and the nitrogen loss rate under 15‰N-CNPs treatment was only 49.45 percent of the urea treatment. After leaching, the rate of nitrogen loss was no significant different between 5‰N-CNPs treatment and 5%DCD treatment. As applying N-CNPs, the amount of exchangeable bases in leaching water was lower than that in the CK1 treatment, the content was characterized by Ca2+>Mg2+>Na+>K+, the base saturation and the soil pH were decreased, and there was a positive correlation between base saturation and the application content of N-CNPs. The result of correlation analysis showed that the applying of N-CNPs was the main reason which reducing nitrogen loss by improving of the base saturation and the soil pH value.