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研究报告

Effect of nano-carbon and its composites on rape growth and soil nitrogen-holding efficiency

摘要：采用盆栽种植实验及淋溶试验方法，研究了纳米碳及其与沸石、保水剂等材料复合对油菜生长和土壤氮素淋溶情况的影响.结果表明，在各处理中，纳米碳与沸石和保水剂复合材料处理（N4）对油菜的株高和干重影响最明显，较空白对照组（CK）分别增加21.12%和16.51%；在土壤淋溶试验中，各处理的土壤总氮淋出量较CK减少25.00%～39.21%，其中，累积淋溶中NH₄⁺-N量占总氮量的4.44%～6.73%，各处理间无显著差异，NO₃^--N量占总氮量的49.33%～60.05%，但各处理间差异显著；纳米碳和沸石复合处理能有效延缓NO₃^--N峰值出现时间，减少NO₃^--N流失.因此，N4处理在促进作物生长和氮素保持增效利用方面效果最佳.

Abstract：Nano-carbon was composited into different host materials, such as zeolite and water-retaining agents, and a pot experiment and a soil leaching test were conducted to investigate their effects on crop growth and soil nitrogen holding. Results showed that for all treatments, the nano-carbon/zeolite/water-retaining agent composite (N4) could promote the growth of rape the most significantly. The biomass of rape increased by 21.12% in length and 16.51% in dry weight as compared with those in the control. The loss of total nitrogen in all treatments decreased by 25.00%~39.21%, within which NH₄⁺-N and NO₃^--N contents accounted for 4.44%~6.73% and 49.33%~60.05% of total N. NH₄⁺-N displayed no significant difference among different treatments while NO₃^--N as one main loss form of N showed significant differences. In addition, the treatment by nano-carbon/zeolite composite effectively delayed the peak of NO₃^--N and further decreased nitrate nitrogen loss. In conclusion, N4 provided a promising option for crops growth and nitrogen retention.