外源碳对鄂南棕红壤N_(2)O排放的影响  

Effects of Exogenous Carbon Input on N_(2)O Emission from the Brown-red Soil of Southern Hubei

作　　者：洪恋 聂文婷[2] 覃卫林 孙敬国 郑志杰 海瑞 林杉[1] 胡荣桂[1] HONG Lian;NIE Wen-ting;QIN Wei-lin;SUN Jing-guo;ZHENG Zhi-jie;HAI Rui;LIN Shan;HU Rong-gui(Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River,Ministry of Agriculture,Huazhong Agricultural University,Wuhan 430072,China;Yangtze River Scientific Research Institute,Yangtze River Water Resources Commission,Wuhan 430010,China;Agriculture and Rural Affairs Bureau of Changyang Tujia Autonomous County,Yichang 443500,China;Hubei Academy of Tobacco Science,Wuhan 430030,China)

机构地区：[1]华中农业大学农业农村部长江中下游耕地保育重点实验室,湖北武汉430070 [2]长江水利委员会长江科学院,湖北武汉430010 [3]长阳土家族自治县农业农村局,湖北宜昌443500 [4]湖北省烟草科学研究院,湖北武汉430030

出　　处：《土壤通报》2023年第6期1333-1341,共9页Chinese Journal of Soil Science

基　　金：国家重点研发计划项目(2021YFD1901202);湖北省重点研发计划项目(2021BCA156);湖北省烟草公司科技项目(027Y2022-022);云南省科技人才与平台计划(202205AF150004)资助。

摘　　要：【目的】探讨不同水分条件下土壤N_(2)O排放对外源碳添加的响应,明确N_(2)O排放与碳源的关系,为农田土壤N_(2)O减排提供理论依据。【方法】设置不添加碳源(C0)、按2 g kg^(-1)含碳量添加葡萄糖(C1)、蔗糖(C2)、甘露醇(C3)共4个不同处理,同时设置低水分(W1)和高水分(W2)两个水分条件,所有处理均添加等量氮肥,在室温25℃下培养一周,测定不同处理的土壤N_(2)O排放通量、CO_(2)排放通量以及土壤无机氮含量。通过统计分析,揭示外源碳和不同水分处理对鄂南棕红壤N_(2)O排放的影响。【结果】在不同水分条件下,外源碳的添加降低了土壤NO_(3)^(-)-N含量和NH_(4)^(+)-N含量。土壤水分显著影响土壤N_(2)O的排放,高水分处理土壤N_(2)O的排放高于低水分处理。与对照相比,添加葡萄糖、蔗糖、甘露醇处理在低水分条件下的土壤N_(2)O-N累积排放量分别增加352.15倍、393.07倍、93.94倍;在高水分条件下,添加葡萄糖、蔗糖、甘露醇处理的土壤N_(2)O-N累积排放量分别增加1.92倍、0.63倍、1.88倍。【结论】3种外源碳输入显著促进土壤N_(2)O排放总量,其中以添加葡萄糖的处理N_(2)O排放最高,高水分条件下土壤N_(2)O排放远高于低水分处理。[Objective]In order to clarify the relationship between soil N_(2)O emission and carbon source,the response of soil N_(2)O emission to carbon addition under different water conditions was studied by indoor incubation experiment.[Method]The experiment set up four different treatments of no carbon source(C0),glucose(C1),sucrose(C2),mannitol(C3)at 2 g kg^(-1) carbon content,and two water conditions of low moisture(W1)and high moisture(W2)were set.All treatments were treated with the same amount of nitrogen fertilizer and cultured at room temperature 25℃ for a week.Soil N_(2)O flux,CO_(2) flux and soil inorganic nitrogen content of different treatments were measured.Through statistical analysis,the effects of exogenous carbon and different water treatments on N_(2)O emission from brown red soil in southern Hubei were revealed.[Result]Under different water conditions,the addition of exogenous carbon decreased the content of NO_(3)^(-)-N and NH_(4)^(+)-N in soil.The results showed that soil moisture significantly affected soil N_(2)O emissions,and the emission of N_(2)O in high-moisture treatment was higher than that in low-moisture treatment.Compared with the control,the cumulative emissions of soil N_(2)O under low moisture conditions were increased by 352.15 times,393.07 times and 93.94 times,respectively,with the addition of glucose,sucrose and mannitol.Under the conditions of high moisture,the cumulative emissions of soil N_(2)O treated with glucose,sucrose and mannitol were increased by 1.92 times,0.63 times and 1.88 times,respectively.[Conclusion]Three kinds of exogenous carbon input significantly promoted the total amount of soil N_(2)O emissions,the treatment added glucose has the highest N_(2)O emission,and the soil N_(2)O emissions under high moisture conditions are much higher than those in low water treatments.

关 键 词：葡萄糖 蔗糖 甘露醇 土壤水分 N_(2)O排放 硝化作用 

分 类 号：X53[环境科学与工程—环境工程]