Characteristics and influence factors of NO2 exchange flux between the atmosphere and P. nigra

论文摘要

Nitrogen dioxide（NO2）is an important substance in atmospheric photochemical processes and can also be absorbed by plants.N02 fluxes between the atmosphere and P.nigrc seedlings were investigated by a double dynamic chambers method in Beijing from June 15to September 3,2017.The range of N02 exchange fluxes between P.nigra seedlings and the atmosphere was from-14.6 to 0.8 nmol/（m2.sec）（the positive data represent N02 emissior from trees,while the negative values indicate absorption）.Under ambient concentrations the mean NO2 flux during the fast-growing stage（Jun.15-Aug.4）was-3.0 nmol/（m2·sec）greater than the flux of-1.5 nmol/（m2-sec）during the later growth stage（Aug.8-Sept.3）The daily exchange fluxes of NO2 obviously fluctuated.The fluxes were largest in the morning and decreased gradually over time.Additionally,the N02 fluxes were larger undei high light intensities than under low light intensities during the whole growth period.The effects of temperature on N02 fluxes were different under two growth periods.The NO2exchange fluxes were larger in a range of temperatures close to 44℃in the fast-growing stage,whereas there were no evident differences in N02 exchange fluxes under widel differing temperatures in the later growth stage.Under polluted conditions,the uptake ability of N02 was weakened.Additionally,the compensation point of N02 was 5.6 ppb ir the fast-growing stage,whereas it was 1.4 ppb in the later growth stage.The depositior velocities of NO2 were between 0.3 and 2.4 mm/sec.

论文目录

• Introduction
• 1. Material and methods
•   1.1. Site and materials
•   1.2. Measurement method of NO2exchange fluxes between P.nigra and the atmosphere
• 2. Results and discussion
•   2.1. Characteristics of NO2exchange fluxes between P.nigra seedlings and the atmosphere
•   2.2. Effect of ambient parameters on NO2flux
•     2.2.1. Effect of ambient NO2concentration on NO2exchange flux between P.nigra and the atmosphere
•     2.2.2. Effects of light intensity on NO2exchange flux between P.nigra and the atmosphere
•     2.2.3. Effect of temperature on NO2exchange flux between P.nigra and the atmosphere
•     2.2.4. The effects of relative humidity on the NO2exchange flux between the atmosphere and P.nigra
•     2.2.5. Effects of pollution weather on NO2exchange flux between P.nigra and the atmosphere
•   2.3. Compensation point of NO2
•   2.4. Deposition velocities of NO2
• 3. Conclusions

文章来源

类型: 期刊论文

作者: Chun Chen,Yuzheng Wang,Yuanyuan Zhang,Chengtang Liu,Xiaoxiu Lun,Yujing Mu,Chenglong Zhang,Junfeng Liu

来源: Journal of Environmental Sciences 2019年10期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 环境科学与资源利用

单位: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,University of Chinese Academy of Sciences,Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences,College of Environmental Science & Engineering, Beijing Forest University

基金: supported by projects of the National Key Research and Development of China (No. 2017YFC0209700,2016YFC0202202),the National Natural Science Foundation of China (No. 41575121,91544211,41727805,21477142)

分类号: X51

页码: 155-165

总页数: 11

文件大小: 2413K

下载量: 24