生态学报2025，Vol.45Issue(6)：2655-2668,14.DOI:10.20103/j.stxb.202406151388
氮负荷增强对冬季闽江河口芦苇湿地土壤N2O产生过程的影响
Effects of enhanced nitrogen load on N2 O production in Phragmites australis marsh soil of the Minjiang River estuary in winter
摘要
Abstract
The typical Phragmites australis marsh in the Minjiang estuary was selected as the study object and a field N load experiment was conducted,which included four N load levels(NN,no N treatment,0 g N m-2 a-1;NL,low N treatment,12.5 g N m-2 a-1;NM,medium N treatment,25 g N m-2 a-1;and NH,high N treatment,75 g N m-2 a-1).The marsh soils were sampled in different N load treatments after 9(December 2021,WT9)and 21 months(December 2022,WT21)of N import and the N2 O production processes of different marsh soils were comparatively assessed through incubation experiments.Results showed that,with increased N loads,the sources of N2 O production varied significantly,with the NM treatment showing the highest total N2 O emissions during both the WT9 and WT21 periods.While the heterotrophic denitrification process significantly reduced N2 O emissions in the soils during the WT9 and WT21 periods,N2 O emissions generally rose with extended N loading durations.Under different N load treatments,the N2 O productions of marsh soils were primarily due to the non-biological process,but its N2 O production generally decreased with increasing N load levels in a short-term period(WT9)and increased in a long-term period(WT21).The higher contributions of non-biological process to N2 O production in different N load treatments mainly depended on the abundant iron(Fe),manganese(Mn)and sulfides in soils and the great alteration of soil pH under enhanced N load conditions.The interactions between N load levels and temperature showed different influences on N2 O production processes in soils of WT9 and WT21 periods.At lower temperature(5.5-11.5℃),the N2 O productions in soils of different N load treatments at WT9 period were mainly dependent on non-biological process,while those at WT21 period were predominated by nitrification and non-biological processes.However,at higher temperatures(17.5℃),the N2 O productions in soils of WT9 and WT21 periods were predominantly governed by non-biological process and nitrifier denitrification process.This study found that enhanced N load altered the original contribution patterns of biological and non-biological processes to soil N2 O production at WT9 and WT21 periods,which mainly influenced the biological or non-biological processes of N2 O production by altering soil nutrient status.Under low temperature and N load conditions in winter in the Minjiang estuary marsh,the interactions between temperature and N enrichment showed an offset effect on soil N2 O production,which was favorable for reducing the N2 O emissions in winter.关键词
氧化亚氮/氮负荷处理/非生物过程/冬季/闽江河口Key words
nitrous oxide/nitrogen load treatment/non-biological process/winter/Minjiang estuary引用本文复制引用
廖宇晨,孙志高,方冠荣,宋振阳,贺攀霏,姚钦予..氮负荷增强对冬季闽江河口芦苇湿地土壤N2O产生过程的影响[J].生态学报,2025,45(6):2655-2668,14.基金项目
福建省自然科学基金重点项目(2023J02012) （2023J02012）
国家自然科学基金面上项目(42371105,41971128) （42371105,41971128）
福建省"闽江学者奖励计划"项目 （）
