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氮肥配施纳米碳对植烟土壤氮素转化及N2O排放的影响
李青山1,2, 王德权3, 高政绪3, 杜传印3, 管恩森3, 王刚3, 李现道4, 张国超4, 王慎强1
1.土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所), 南京 210008;2.中国科学院大学, 北京 100049;3.山东潍坊烟草有限公司, 山东潍坊 261205;4.山东省烟草研究院, 济南 250098
摘要:
采用实验室静态培养方法,通过氮肥配施不同量纳米碳来探究纳米碳对植烟土壤氮素转化以及N2O排放的影响。试验在等氮条件下共设置5个处理:CK,硝酸铵(N 200 mg/kg,下同);NC1,硝酸铵+纳米碳(2.5 g/kg);NC2,硝酸铵+纳米碳(5 g/kg);NC3,硝酸铵+纳米碳(10 g/kg);NC4,硝酸铵+纳米碳(15 g/kg)。结果表明:NC3和NC4处理较CK处理显著降低了土壤pH(P<0.05);与CK处理相比,NC1、NC2、NC3和NC4处理在培养前期增加了土壤NO3-N含量,相应降低了NO4-N含量;在培养结束时,与CK处理相比,添加纳米碳处理显著降低了无机氮含量,而显著增加了CO2累积排放量(P<0.05);另外,添加纳米碳处理较CK处理增加了N2O累积排放量,但仅NC4处理与CK处理间差异显著(P<0.05),N2O累积排放量与CO2累积排放量呈显著正相关关系(R2=0.50,P<0.001)。可见,添加纳米碳能够降低土壤pH和无机氮含量,抑制土壤硝化作用,同时还可以提高微生物活性和增加N2O排放量。
关键词:  纳米碳  植烟土壤  氮素转化  N2O  CO2
DOI:10.13758/j.cnki.tr.2021.02.006
分类号:S156.2
基金项目:山东潍坊烟草有限公司项目(2019370700270458)资助。
Effects of Nano-carbon on Nitrogen Transformation and N2O Emissions from Tobacco Planting Soils
LI Qingshan1,2, WANG Dequan3, GAO Zhengxu3, DU Chuanyin3, GUAN Ensen3, WANG Gang3, LI Xiandao4, ZHANG Guochao4, WANG Shenqiang1
1.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Shandong Weifang Tobacco Co., Ltd., Weifang, Shandong 261205, China;4.Shandong Tobacco Academy, Jinan 250098, China
Abstract:
A laboratory static culture was conducted in order to better understand the effects of different amounts of nano-carbon on nitrogen transformation and N2O emission of tobacco-plating soil. The experiment included five treatments on equivalent N basis:CK, ammonium nitrate (N 200 mg/kg); NC1, ammonium nitrate + nano-carbon (2.5 g/kg); NC2, ammonium nitrate + nano-carbon (5 g/kg); NC3, ammonium nitrate + nano-carbon (10 g/kg); NC4, ammonium nitrate + nano-carbon (15 g/kg). The results showed that NC3 and NC4 treatments significantly decreased soil pH value compared with CK (P<0.05). Compared with CK, treatments amended with nano-carbon increased the concentrations of NH4+-N in the early period of incubation and decreased the concentrations of NO3--N accordingly. At the end of the incubation, treatments amended with nano-carbon significantly decreased the concentrations of inorganic nitrogen compared to CK (P<0.05). Addition of nano-carbon treatment significantly increased the cumulative CO2 emissions compared to CK (P<0.05). Compared with CK, NC4 treatment significantly increased the cumulative N2O emissions (P<0.05). In addition, there was a significant positive correlation between cumulative N2O emissions and cumulative CO2 emissions (R2=0.60, P<0.001). The above results indicate that the addition of nano-carbon can decrease soil pH value and the concentrations of inorganic nitrogen, inhibit soil nitrification, improve microbial activity and increase N2O emissions.
Key words:  Nanocarbon  Tobacco-plantation soils  Nitrogen transformation  N2O  CO2

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