| 城市草坪温室气体排放特征及影响因素 |
| 摘要点击 3294 全文点击 804 投稿时间：2022-11-29 修订日期：2023-02-13 |
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| 中文关键词 城市草坪 温室气体 通量 波动特征 环境因子 |
| 英文关键词 urban lawns greenhouse gases(GHGs) flux fluctuation characteristics environmental factors |
| DOI 10.13227/j.hjkx.20231223 |
| 作者 | 单位 | E-mail | | 陈丽涵 | 浙江工业大学环境学院, 杭州 310014 | 2112127154@zjut.edu.cn | | 刘硕 | 浙江碳中和创新研究院, 杭州 310014 | | | 林溢 | 浙江碳中和创新研究院, 杭州 310014 | | | 郭娜 | 浙江碳中和创新研究院, 杭州 310014 | | | 臧昆鹏 | 浙江碳中和创新研究院, 杭州 310014 | | | 陈圆圆 | 浙江碳中和创新研究院, 杭州 310014 | | | 李嘉鑫 | 浙江工业大学环境学院, 杭州 310014 | | | 邱珊珊 | 浙江工业大学环境学院, 杭州 310014 | | | 卿雪梅 | 浙江工业大学环境学院, 杭州 310014 | | | 洪海祥 | 浙江工业大学环境学院, 杭州 310014 | | | 蒋凯 | 浙江工业大学环境学院, 杭州 310014 | | | 熊浩宇 | 浙江工业大学环境学院, 杭州 310014 | | | 方双喜 | 浙江工业大学环境学院, 杭州 310014
浙江碳中和创新研究院, 杭州 310014 | fangsx@zjut.edu.cn |
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| 中文摘要 |
| 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（CO2、CH4、N2O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N2O的源，平均通量分别为（0.66±0.17）μg·（m2·min）-1和（0.58±0.20）μg·（m2·min）-1；是CH4和CO的汇，其中CH4平均通量分别为（-0.21±0.078）μg·（m2·min）-1和（-0.26±0.10）μg·（m2·min）-1，CO分别为（-6.36±1.28）μg·（m2·min）-1和（-6.55±1.69）μg·（m2·min）-1.城市草地和土壤CO2平均通量分别为（5.28±0.75） mg·（m2·min）-1和（4.83±0.91） mg·（m2·min）-1.基于相关性分析研究发现，草地和土壤的CO2和N2O通量均与降水量呈显著的负相关，而CH4和CO通量与降水量呈显著的正相关；除草地CH4通量与土壤温度无显著相关、草地N2O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CO2（R2为0.371和0.314）和N2O （R2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（R2为0.290和0.234）要显著于其它温室气体. |
| 英文摘要 |
| 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(CO2, CH4, N2O, 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 N2O, with the average fluxes of (0.66±0.17) and (0.58±0.20) μg·(m2·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·(m2·min)-1 for CH4 and (-6.36±1.28) and (-6.55±1.69) μg·(m2·min)-1 for CO, respectively. The average CO2emission fluxes of urban grassland and soil were(5.28±0.75) and (4.83±0.91) mg·(m2·min)-1, respectively. The correlation analysis indicated that the CO2 and N2O fluxes of grassland and soil were negatively correlated with precipitation, whereas the CH4 and CO fluxes were positively correlated with it. There was no significant correlation between grassland CH4 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 CO2 (R2=0.371 and 0.314) and N2O(R2=0.371 and 0.284) fluxes from both grassland and soil was affected by precipitation, whereas CO fluxes (R2=0.290 and 0.234) were mainly driven by soil temperature compared with the other greenhouse gases. |
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