氮掺杂碳纳米粒子对土壤氮素转化及油菜苗期生长的影响

为了解氮掺杂碳纳米粒子(N-CNPs)对土壤氮素转化和植物生长的影响,以油菜品种湘油15号为研究材料,以常规硝化抑制剂双氰胺(DCD)为阳性对照,采用室内盆栽法分析不同剂量N-CNPs对移植油菜后土壤氮素形态、含量以及油菜生长状况和氮肥利用率的影响。结果表明:N-CNPs能显著提高土壤NH_4~+-N含量同时降低NO_3~--N含量,与单施尿素相比,NH_4~+-N最大提升118%,NO_3~--N最大降低49.74 mg/kg。5‰和15‰的N-CNPs硝化抑制能力较5%的DCD高,在23 d时差异达到了显著水平。5‰的N-CNPs可增加油菜苗期氮素积累量,其氮肥利用率较单施尿素提升了16.77个百分点。N-CNPs剂量提升至15‰,油菜生长受到抑制。总体而言,N-CNPs具有较好的硝化抑制能力,提升氮肥利用率;5‰剂量的N-CNPs能促进油菜苗期的生长和氮素的积累。

Effects of adding nitrogen doped carbon nanoparticles(N-CNPs)on nitrogen transformation in soil and on rapeseed growth at seeding stage

The effects of N-CNPs on nitrogen transformation and use efficiency were studied to provide theory basis for N-CNPs application and to explore approaches of increasing rapeseed yield and improving nitrogen use efficiency. A pot culture experi-ment was carried out with rapeseed cultivar Xiangyou 15 in the biological park of Hunan university of science and technology. Six treatments (CK, CK1, CK2, T1, T2, T3) were set up and each treatment had 3 pots and each pot had 4 plants. T1, T2 and T3 treatment were used for N-CNPs adding urea, CK2 treatment was used for DCD adding urea, CK1 treatment was used for urea. The results showed that, the process of nitration was obviously restrained with N-CNPs, compared with the CK1 treatment, the NH4+ -N content increased by 118% and the NO3--N content decrease of 49. 74 mg/kg. The N-CNPS application significantly improved N accumulation in leaf, stem and root at seeding stage, and increased dry matter accumulation of rapeseed plant. The rapeseed was strongly inhibited with increases N-CNPs concentrations to 15‰. In con-clusion, the optimal application rate of N-CNPs was 5‰with N application, which increased the fertilizer N use efficiency, and promoted the rapeseed growth and N utilization at early growth stages significantly.