闽江河口湿地土壤羟胺和亚硝态氮非生物过程N2O产生潜力及其影响因素  

Potential and affecting factors of N2O production through abiotic processes of hydroxylamine and nitrite in wetland soils of Min River Estuary

作　　者：漆梦婷 罗柳 王宛珍 钱伟[1,2] 仝川[1,2] 李小飞[1,2] QI Mengting;LUO Liu;WANG Wanzhen;QIAN Wei;TONG Chuan;LI Xiaofei(School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China;Key Laboratory of Humid Subtropical Eco-geographical Processes of Ministry of Education,Fujian Normal Universi-ty,Fuzhou 350007,China)

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]福建师范大学湿润亚热带生态-地理过程教育部重点实验室,福州350007

出　　处：《生态学杂志》2023年第3期591-598,共8页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(42071130);福建省自然科学基金项目(2020J01184)资助。

摘　　要：河口湿地氮转化的非生物过程可产生氧化亚氮(N_(2)O)。羟胺(NH2OH)和亚硝态氮(NO_(2)-)可通过非生物过程产生N_(2)O,但其产生潜力及其影响因素不甚清楚。本研究以亚热带典型河口——闽江河口湿地为对象,通过不加氮(CK)、加NH2OH和NO_(2)-3种处理,研究其非生物过程N_(2)O产生潜力及其影响因素。结果表明,不同处理N_(2)O产生速率具有显著差异(P<0.05)。添加NH2OH、NO_(2)-和不加氮土壤非生物过程N_(2)O产生速率分别为16.88~307.99、-0.50~27.51和-1.20~2.97 ng·g^(-1)·h^(-1)。土壤添加NH2OH非生物过程产生N_(2)O的贡献为20.74%~98.73%,而添加NO_(2)-贡献为1.27%~79.26%。5种植被土壤在3种处理下非生物过程N_(2)O平均产生速率差异显著(P<0.05)。NO_(2)-非生物过程N_(2)O平均产生速率为秋茄>互花米草>芦苇>海三棱藨草>短叶茳芏土壤,而NH2OH非生物过程N_(2)O平均产生速率为海三棱藨草>互花米草>芦苇>短叶茳芏>秋茄土壤。土壤中羟胺具有较高的非生物产生N_(2)O潜力,不同植被土壤NH2OH和NO_(2)-非生物过程产生N_(2)O存在明显的差异。土壤pH、NO_(2)-、NO_(3)-、Fe^(2+)、Fe^(3+)和C/N是影响NH2OH和NO_(2)-非生物过程产生N_(2)O的主要影响因素。Abiotic nitrogen transformation processes can generate N_(2)O in estuarine wetlands.The abiotic processes of hydroxylamine(NH2OH)and nitrite(NO_(2)-)can produce N_(2)O,but production potential and affecting factors remain unclear.We conducted an experiment with three treatments(without nitrogen addition(CK),NH2OH and NO_(2)-additions)to determine N_(2)O production rates from abiotic processes in wetland soils of Min River Estuary.The results showed that N_(2)O production rates significantly differed among three treatments(P<0.05).The potential production rates of N_(2)O from abiotic processes under NH2OH addition,NO_(2)-addition,and without nitrogen treatments ranged from 16.88 to 307.99,-0.50 to 27.51 and-1.20 to 2.97 ng·g^(-1)·h^(-1),respectively.The contributions of N_(2)O production from abiotic processes of NH2OH and NO_(2)-additions were 20.74%-98.73%and 1.27%-79.26%,respectively.Average N_(2)O production rates of abiotic processes for all the five soil types varied significantly among the three treatments(P<0.05).The average N_(2)O production rates of abiotic process of NO_(2)-were in the order of Kandelia candel>Spartina alterniflora>Phragmites australis>Scirpus mariqueter>Cyperus malaccensis,while the rates of abiotic processes of NH_(2)OH were S.mariqueter>S.alterniflora>P.australis>C.malaccensis>K.candel.These results suggest that abiotic processes of NH2OH have higher N_(2)O production rates compared to NO_(2)-,and the N_(2)O production from abiotic processes of soil NH2OH and NO_(2)-varied largely among different vegetation soils.Soil pH,NO_(2)-,NO_(3)-,Fe^(2+),Fe^(3+)and C/N ratio were crucial factors affecting N_(2)O production rates from abiotic processes of NH2OH and NO_(2)-.

关 键 词：羟胺 亚硝态氮 非生物过程 氧化亚氮 闽江口 

分 类 号：X144[环境科学与工程—环境科学]