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氮肥掺杂纳米碳施用对植烟土壤氮转化速率以及N2O排放的影响
李青山, 王慎强
中国科学院南京土壤研究所
摘要:
以植烟土壤为研究对象,运用静态培养系统研究方法,设置室内培养实验,研究添加不同量纳米碳对植烟土壤氮素转化速率以及N2O的影响。试验设置了5个处理:CK,硝酸铵(200 mg N·kg-1,下同); NC1,硝酸铵+纳米碳(2.5 g·kg-1);NC2,硝酸铵+纳米碳(5 g·kg-1);NC3,硝酸铵+纳米碳(10 g·kg-1);NC4,硝酸铵+纳米碳(15 g·kg-1)。结果表明,与CK处理相比,NC1-NC4处理降低了无机氮含量,增加了可溶性有机氮含量;但在培养前期增加了NH+ 4-N含量,减少了NO- 3-N含量。添加纳米碳处理的CO2累积排放量均显著大于CK 处理(P <0.05),N2O累积排放量均大于CK处理,但只有NC4处理与CK处理间的差异达到显著水平(P <0.05)。分析表明,添加纳米碳降低土壤氮素净矿化和净硝化速率,增加了微生物活性,当纳米碳添加量大于等于15 g·kg-1时显著提高了N2O的累积排放量。可见,纳米碳具有一定抑制硝化作用和促进有机质分解的能力。
关键词:  纳米碳  植烟土壤  氮素转化  N2O  CO2
DOI:
分类号:S714
基金项目:提高烟叶品质和产量的土壤碳氮调节技术示范”(2019-44)
Effects of nanocarbon on nitrogen transformation rate and N2O emissions from tobacco plantation soil
liqingshan, wangshenqiang
Istitute of soil science, Chinese academy of sciences
Abstract:
The influence of different amount of nanocarbon on the emission of CO2 and N2O and soluble nitrogen components in tobacco-planting soil was studied. The static culture systems were adopted in an indoor incubation experiment. The experiment included five treatments applied on an equivalent N basis: CK, ammonium nitrate (200 mg N·kg-1); T1, ammonium nitrate+ nanocarbon (2.5 g·kg-1); T2, ammonium nitrate+ nanocarbon (5 g·kg-1); T3, ammonium nitrate+ nanocarbon (10 g·kg-1); T4, ammonium nitrate+ nanocarbon (15 g·kg-1). The results showed that compared with CK treatment, the treatments of NC1-NC4 decreased the concentrations of inorganic nitrogen and increased the concentrations of soluble organic nitrogen, but increased the concentrations of NH+ 4-N and decreased the concentrations of NO- 3-N in the early stage of incubation experiment. The cumulative CO2 emissions from treatments applied with nanocarbon were significantly greater than those of CK treatment (P < 0.05), and the N2O cumulative emissions of NC1-NC4 treatments were higher than those of CK treatment, but only the difference between NC4 and CK treatment reached a significant level (P < 0.05). The analyses showed that NC1-NC4 treatments applied with nano-carbon reduces the net mineralization and net nitrification rate of soil nitrogen and increased the microbial activity. When the amount of nano-carbon added is greater than or equal to 15 g·kg-1, the cumulative emission of N2O is significantly increased (P<0.05). It can be seen that nanocarbon has the ability to inhibit nitrification and promote decomposition of organic matter.
Key words:  Nanocarbon  Tobacco-planting soil  Nitrogen transformation  N2O  CO2

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