为科学选择城镇造林或绿化树种,对浙江省嘉兴市新塍镇13个树种林分内的空气负离子浓度进行日变化监测研究.结果表明:不同树种林分的空气负离子浓度具有一定差异.樱花Cerasus serrulata-小叶黄杨Buxus sinicavar.parrifolia混交林、红枫Acer palmatum‘Atropurpureu'纯林内空气负离子浓度相对较高,黄山栾树Koelreuteriapaniculata与无惠子Sapindus mukorossi纯林内空气负离子浓度较低.不同结构林分的空气负离子浓度差异明显,表现为乔灌混交林＞灌木林＞乔木林,其空气负离子浓度日变化趋势较为一致,均在上午10:00左右出现1个峰值,在下午16:00-18:00呈上升趋势.对空气负离子与环境因子的相关性分析显示,空气负离子与相对湿度呈极显著正相关(P＜0.01),而与温度极显著负相关(P＜0.01),与紫外线强度显著负相关(P＜0.05).对空气负离子与林分因子的相关性分析显示,空气负离子浓度与林分密度呈显著正相关(P＜0.05).%To provide a theoretical basis for choosing suitable tree species for urban afforestation, diurnal variation of the aero-anion concentration surrounding 13 different stand types (Sapindus mulorossi, Michelia maudiae, Michelia chapensis, Elaeocarpus sylvestris, Cinnamomum camphora, Magnolia grandifiora, Acer palmatum 'Atropurpureu' , Dendronenthamia japonica var. chinensis, Osmanthus fragrans, Koelrenteria paniculata, Prunus serrulata-Buxus sinica, Magnolia denudata-Buxus sinica, and Liquidambar formosana) in the nursery of Xincheng Town, Jiaxing City in Zhejiang Province was compared by LSD and studied using a correlation analysis with environmental factors and characteristic of plant communities. Results showed that among the 13 stand types, a mixed plantation of Prunus serrulata with Buxus sinica (822 particle·cm-3) and a pure plantation of Acer palmatum 'Atropurpureu' (743 particle·cm-3) had higher aero-anion concentrations with Koelreuteria paniculata (533 particle·cm-3) and Sapindus mukorossi (532 particle·cm-3) pure plantations having lower concentrations. A multilayer tree-shrub structure had the highest aero-anion concentration (751 particle·cm-3) followed by shrubs (700 particle·cm-3) then trees (622 particle·cm-3). According to the 6: 00 to 18: 00 diurnal variation curves, the aero-anion concentration tended to peak at 10: 00 and with an another general increase from 16: 00 to 18: 00. The correlation analysis showed a strong significant, positive correlation between aero-anion concentration and relative humidity(P＜0.01, r = 0.473); a strong significant, negative correlation for aero-anion concentration and temperature (P＜0.01, r = - 0.504); a significant negative correlation between aero-anion concentration and ultraviolet radiation intensity (P＜0.05, r = - 0.305); and a significant positive correlation for aero-anion concentration and planting density (P＜0.05, r = 0.648). The plant communities were able to improve the aero-anion concentration of mini-surrounding.
展开▼
