冬季不同植物群落对大气颗粒物浓度的阻滞作用

为探讨不同植物群落对大气颗粒物浓度的影响，以郑州市金水区为例，在2020年冬季(2020年12月—2021年2月)对园林绿化区(数码公园)、居住区(正弘·蓝堡湾)、文教区(河南农业大学)内植物群落的PM_2.5和PM₁₀质量浓度及气象因子(温度、相对湿度和风速)进行监测.结果表明：每个功能区中不同样地之间的PM_2.5、PM₁₀质量浓度日变化趋势基本一致，一般为早高晚低；不同植物群落之间PM_2.5和PM₁₀质量浓度存在显著差异性，其中广场样地与其他样地的差异性最显著；3个功能区中各样地对PM_2.5和PM₁₀质量浓度的阻滞率均表现为乔灌草结构最高，乔灌结构和乔草结构次之，且多表现为乔灌样地大于乔草样地，灌草结构和草坪最低；研究区域PM_2.5、PM₁₀质量浓度与温度呈负相关，与相对湿度呈正相关，与风速呈负相关.

Blocking effects of plant communities on atmospheric particles in winter

To explore the blocking impact of plant communities on atmospheric particulate matters,we monitored the PM_2.5 and PM₁₀ concentrations and related meteorological factors near plant communities in three functional areas of Zhengzhou''s Jinshui district,which were garden area (Digital Park),residential area (Zhengzhou Blue Bay),and cultural & educational area (Henan Agricultural University).The monitoring period covered a whole winter from December 2020 to February 2021.The results indicated that the diurnal variation trends of PM_2.5 and PM₁₀ concentrations were basically the same for all sampling plots,which were generally high in early morning and low in evening;obvious differences in PM_2.5 and PM₁₀ concentrations were observed among plant communities,which were most significant between the square plot and other plots;for the three functional areas,the blocking of PM_2.5 and PM₁₀ were all the strongest by the combined structure of arbor,shrub and grass,followed by arbor & shrub and arbor & grass structures,and the lowest by structure of shrub & grass and single structure of grass;the PM_2.5 and PM₁₀ concentrations were observed to be negatively correlated with temperature and wind speed,and positively correlated with relative humidity.