城市河岸带绿地N2O和CH4排放对硝态氮输入的短期响应研究  

Short-term Effects of Exogenous Nitrate on N2O and CH4 Emission from Greenbelt in Urban Riparian Zone

作　　者：邓焕广[1] 张智博 刘涛 张菊[1] DENG Huan-guang;ZHANG Zhi-bo;LIU Tao;ZHANG Jv(School of Environment and Planning,Liaocheng University,Liaocheng 252059,China)

机构地区：[1]聊城大学环境与规划学院

出　　处：《聊城大学学报（自然科学版）》2020年第2期97-104,共8页Journal of Liaocheng University:Natural Science Edition

基　　金：国家自然科学基金项目（41401563）;山东省自然科学基金项目（ZR2014JL028）资助

摘　　要：为了探讨氮输入对城市河岸带绿地温室气体N2O和CH4短期排放的影响,采用静态箱-气相色谱法系统测定了不同季节上海市典型城市河岸绿化带草地输入硝酸盐(NO-3)后N2O和CH 4排放通量的短期(3-5d)时间变化特征,并同时测定了气温、光照强度、不同深度地温和土壤的理化性质.结果表明,NO-3的输入在短期内可以显著增加春夏秋季N2O、春夏季CH4的排放通量,而在其他季节变化不明显;季节是影响N2O和CH4排放的主要因素,NO-3输入对N 2O排放具有显著影响且可以降低季节影响强度的显著性.在无NO-3输入的情况下,N 2O的排放通量和气温、地温相关性不显著,但随着输入量的增加,相关性程度逐渐增强;而CH 4在较低NO-3输入量(<3.18 g N·m^-2)下其排放通量和地温不具有显著相关关系(P>0.05),而在较高输入量下,则具有显著的正相关关系(P<0.05),说明NO-3输入后短期内地温是影响河岸带绿地温室气体产生的重要的季节性因子,因此探讨氮输入对湿地温室气体排放的影响应考虑其时间变异性.In order to study the short-term effects of exogenous nitrate on emission fluxes of N2O and CH4 from greenbelt in urban riparian zone,five gradients of nitrate amount input were set,and the emission fluxes of CH4 and N2O with 3-5 days in different seasons after input of different nitrate amount in the typical riparian in Shanghai were measured by using the static chamber-GC techniques.The air temperature,the illumination intensity,soil temperature at different depths and soil physicochemical properties were also determined.The results showed that the emission fluxes of N2O in spring,summer and autumn and the fluxes of CH4 in spring and summer was significantly increased by the input of nitrate.Season was the main factor influencing the CH 4 and N2O emission fluxes.Furthermore,the exogenous nitrate could reduce the significance of the influence intensity of season.The correlation analysis between the N2O and CH4 discharge fluxes and the environment factors showed that when there was no exogenous nitrate input,N2O emission fluxes didn’t significantly correlated with the air temperature and soil temperature at different depths.However,with the increase of nitrate input,the degree and the significance of the correlations increased dramatically.But in terms of CH4,there were no significant correlations between the CH4 discharge fluxes and the soil temperature in the treatments of lower nitrate concentrations(<3.18 g N/m^2),but it was on the opposite for the treatments of higher nitrate concentrations.This further indicated that within the short term after the nitrate input the soil temperature was the significant seasonal factor affecting the greenhouse emission in the greenbelt of urban riparian zone.This study indicated that the temporal variability should be taken into consideration when examining the effects of nitrate input on the emission of greenhouse gases in the riparian zone.

关 键 词：氮输入 N2O CH4 土壤 城市河岸带 

分 类 号：X53[环境科学与工程—环境工程] S153[农业科学—土壤学]