论文部分内容阅读
以龙爪槐(Sophora japonica var.pendula)、金银花(Lonicera japonica)、洋白蜡(Fraxinus chinensis)、枫杨(Pterocarya stenoptera)、二乔玉兰(Magnolia×Soulangeana)、桑树(Morus alba)和银杏(Ginkgo biloba)为研究对象,采用洗脱法对7种园林树木单位面积的叶片吸附总颗粒物和PM2.5能力进行了测定,并测定了7种树木叶片滞尘前后叶片脯氨酸含量的变化,以研究不同种树木叶片滞尘效应,以及叶片滞尘后对植物生理活动的影响。结果表明:不同树种单位面积的滞尘量不同,银杏滞尘量较高,为0.034mg·cm-2,桑滞尘量仅有0.010mg·cm-2。叶片滞尘之后,银杏、枫杨、龙爪槐、桑、二乔玉兰叶片脯氨酸含量均有21.73%~338.25%等不同程度的升高,脯氨酸增长量由大到小排列为银杏、枫杨、龙爪槐、桑、二乔玉兰;而金银花和洋白蜡叶片脯氨酸含量不升反降,洋白蜡降低了59.77%,金银花降低了66.14%。综上说明银杏滞尘(PM>2.5)能力最强,桑滞尘(PM>2.5)最弱。
The leaves of Sophora japonica var.pendula, Lonicera japonica, Fraxinus chinensis, Pterocarya stenoptera, Magnolia × Soulangeana, Morus alba and Ginkgo biloba) as the research object, the total particulate matter (PM2.5) and total particulate matter (PM2.5) adsorption per unit area of seven species of garden trees were determined by elution method. The changes of proline content in leaves of seven tree species The effects of different types of trees on the dust-holding effect and the effect of the leaves on the physiological activities of the plants were studied. The results showed that the amount of dust per unit area of different tree species was different, the amount of dust in Ginkgo biloba was 0.034 mg · cm-2 and the amount of dust in Sang-bao was only 0.010 mg · cm-2. Proliferation of leaves, Ginkgo biloba, Pterocarya stenoptera, Longhuhuai, mulberry, two Joe Magnolia leaf Proline content were 21.73% ~ 338.25% and other levels were increased, proline increased from small to large arrangement of ginkgo Pterocarya stenoptera, Sophoria sylvestris var. Mongolica and Elaeagnus angustifolia. However, proline contents in leaves of honeysuckle and Balsam pear rose from 59.77% and 66.14% respectively. In summary, the ability of ginkgo dusting is the strongest (PM> 2.5), the weakest of mulberry dust (PM> 2.5).