城市草坪温室气体排放特征及影响因素  

Characteristics and Influencing Factors of Greenhouse Fluxes from Urban Lawn

作　　者：陈丽涵 刘硕 林溢 郭娜 臧昆鹏 陈圆圆 李嘉鑫 邱珊珊 卿雪梅 洪海祥 蒋凯 熊浩宇 方双喜 CHEN Li-han;LIU Shuo;LIN Yi;GUO Na;ZANG Kun-peng;CHEN Yuan-yuan;LI Jia-xin;QIU Shan-shan;QING Xue-mei;HONG Hai-xiang;JIANG Kai;XIONG Hao-yu;FANG Shuang-xi(College of Environment,Zhejiang University of Technology,Hangzhou 310014,China;Zhejiang Carbon Neutral Innovation Institute,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学环境学院,杭州310014 [2]浙江碳中和创新研究院,杭州310014

出　　处：《环境科学》2023年第12期6680-6691,共12页Environmental Science

基　　金：国家重点研发计划项目(2020YFA0607502);国家自然科学基金项目(42275113);浙江省“高层次人才特殊支持计划项目”(2021R542048)。

摘　　要：草坪作为城市绿地的重要组成部分,其温室气体的吸收或排放不容忽视.然而当前对亚热带城市草坪温室气体通量的研究相对匮乏.采用静态箱-气相色谱法,对杭州市城区典型城市草坪的多种温室气体(CO_(2)、CH_(4)、N_(2)O和CO)地气交换通量进行了连续观测研究.结果表明,城市草坪的温室气体月平均通量变化明显,而其日变化特征并不明显.城市草地和土壤(无植被生长的裸土)是大气N_(2)O的源,平均通量分别为(0.66±0.17)μg·(m^(2)·min)^(-1)和(0.58±0.20)μg·(m^(2)·min)^(-1);是CH_(4)和CO的汇,其中CH_(4)平均通量分别为(-0.21±0.078)μg·(m^(2)·min)^(-1)和(-0.26±0.10)μg·(m^(2)·min)^(-1),CO分别为(-6.36±1.28)μg·(m^(2)·min)^(-1)和(-6.55±1.69)μg·(m^(2)·min)^(-1).城市草地和土壤CO_(2)平均通量分别为(5.28±0.75)mg·(m^(2)·min)^(-1)和(4.83±0.91)mg·(m^(2)·min)^(-1).基于相关性分析研究发现,草地和土壤的CO_(2)和N_(2)O通量均与降水量呈显著的负相关,而CH_(4)和CO通量与降水量呈显著的正相关;除草地CH_(4)通量与土壤温度无显著相关、草地N_(2)O通量与土壤温度呈显著负相关外,其余各温室气体通量与土壤温度均呈显著正相关.另外,城市草坪的草地和土壤CO_(2)(R^(2)为0.371和0.314)和N_(2)O(R^(2)为0.371和0.284)通量季节变化受降水量的影响要大于其它温室气体,而土壤温度对CO通量的影响(R^(2)为0.290和0.234)要显著于其它温室气体.As an important component of urban green spaces,greenhouse gas uptake or emissions from urban lawns cannot be ignored.However,studies of greenhouse gas fluxes from subtropical urban lawns are relatively sparse.The static chamber-gas chromatography method was applied to monitor the ground-air exchange fluxes of various greenhouse gases(CO_(2),CH_(4),N_(2)O,and CO)in typical urban lawns of Hangzhou City.Our results showed that the average fluxes had significant seasonal cycles but ambiguous diurnal variations.The grassland and the soil(naked soil without vegetation coverage)acted as sources of atmospheric N_(2)O,with the average fluxes of(0.66±0.17)and(0.58±0.20)μg·(m^(2)·min)^(-1) for N2O,respectively;however,they were also sinks of CH4 and CO,with the average fluxes of(-0.21±0.078)and(-0.26±0.10)μg·(m^(2)·min)^(-1) for CH4 and(-6.36±1.28)and(-6.55±1.69)μg·(m^(2)·min)^(-1) for CO,respectively.The average CO_(2)emission fluxes of urban grassland and soil were(5.28±0.75)and(4.83±0.91)mg·(m^(2)·min)^(-1),respectively.The correlation analysis indicated that the CO_(2) and N_(2)O fluxes of grassland and soil were negatively correlated with precipitation,whereas the CH_(4) and CO fluxes were positively correlated with it.There was no significant correlation between grassland CH_(4) fluxes and soil temperature,and N2O fluxes had a significant negative correlation with soil temperature;the other greenhouse gas fluxes showed a significant positive correlation with soil temperature.In addition,the seasonal variation in CO_(2)(R^(2)=0.371 and 0.314)and N_(2)O(R^(2)=0.371 and 0.284)fluxes from both grassland and soil was affected by precipitation,whereas CO fluxes(R^(2)=0.290 and 0.234)were mainly driven by soil temperature compared with the other greenhouse gases.

关 键 词：城市草坪 温室气体 通量 波动特征 环境因子 

分 类 号：X16[环境科学与工程—环境科学]