摘要
以河南省新乡市典型城市公园作为研究对象,对公园周边道路、绿化带及公园内绿地等不同环境中近地面大气的CO_2、CH_4、N_2O含量进行监测,以探讨有风条件下城市绿地系统对近地面大气温室气体含量及分布的影响。结果表明,研究区域内CO_2、N_2O的含量分布受风的影响较为明显,2种风速条件(6.5 m·s^(-1)和5.5 m·s^(-1))下CO_2均表现出向下风向迁移的趋势,而N_2O趋向于向风向左侧积累。对比不同监测层次低层大气温室气体平均含量发现,城市公园内部CO_2含量低于道路和绿化带,风速较大(6.5 m·s-1)时各层次CO_2、N_2O含量低于风速较小环境,但不同风速条件下CO_2平均含量差异不显著;N_2O含量受风速的影响主要表现在公园中心处变化显著(P=0.005),在风速较大时该点N_2O含量低于周围研究区域(P<0.05),低风速时期公园中心处N_2O含量增加,但与其他监测区域无显著差异。2种风速条件下CH_4平均含量在道路与公园中心处变化显著(P<0.001),高风速条件下公园中心CH_4平均含量高于其他研究区域,而低风速时含量最低。综合研究结果表明,风条件改变了温室气体在公园景观系统中的传输,而绿地结构进一步影响了温室气体的扩散和累积,绿化带对道路源温室气体输送具有一定阻滞效应,使得公园内的综合增温潜势低于周围道路,说明该公园绿地系统具有调节局地微气象条件的生态功能。
Typical urban park in Xinxiang City of Henan Province was selected to explore the effects of green space on greenhouse gases distributions in the near-surface atmospheric layer under different wind conditions.Concentrations of atmospheric CO2,CH4 and N2O were monitored in different positions of the park,so did the road and green belt surrounding it.The result showed that CO2 and N2O distributions rather than CH4 were influenced by wind speed conditions.Higher CO2 concentrations were found in the downwind areas,while higher N2O concentrations were found in the left flank of the wind under different wind conditions(6.5 m·s^-1 and 5.5 m·s^-1).Comparing average concentrations of the gases in different study areas,we found that CO2 concentrations in the park were lower than the surrounding environment under different wind conditions.In addition,the CO2 concentrations were lower,when the wind speed was higher(6.5 m·s^-1),but there was no significant difference between the two sampling dates.N2O concentration in the central of the park was lowest in the study area under higher wind speed(P<0.05),and increased significantly under lower wind speed(5.5 m·s^-1)(P=0.005).Atmospheric CH4 concentrations of the road and the central park were significantly changed by wind conditions(P<0.001),with highest value under higher wind speed and lowest value under lower wind speed in the central park.Comprehensive study on the concentrations,distributions and the greenhouse potential(GWP)of all the gases showed that the wind condition changed the transportation of gases among different landscapes,and the green area could further change the gases distributions,as the green belts had retarding effect to the greenhouse gases transportation,resulted in lower GWP inside the park than the road surrounded it.These results may indicate that the green land of park we studied has ecological function of regulating local meteorological conditions.
作者
侯翠翠
郭梦源
杨凡
蔡明蕾
王靖
王华
申晓萌
HOU Cuicui;GUO Mengyuan;YANG Fan;CAI Minglei;WANG Jing;WANG Hua;SHEN Xiaomeng(College of Life Sciences,Henan Normal University,Xinxiang 453007,China)
出处
《生态环境学报》
CSCD
北大核心
2018年第10期1908-1915,共8页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(41601534
41401549)
河南省教育厅项目(17A180027)
河南师范大学青年科学基金项目(2013qk09)
河南师范大学大学生创新训练项目(201610476086)
