cje
Previous Articles Next Articles
CAO Xue-hui, AN Hai-long, LIU Qing-qian, LIU Chao, GUO Hui-hong, YIN Wei-lun, XIA Xin-li**
Online:
Published:
Abstract: Lead (Pb) pollution caused by PM2.5 is becoming increasingly serious. In this study, PM2.5 particles were generated by aerosol generator to simulate different Pb pollution levels. The adhesion, absorption and transportation of PM2.5Pb by leaves of Populus euramericana ‘Neva’ seedlings were studied. The changes of stomata and physiological characteristics in P. euramericana leaves were also investigated. The results showed that Pbcontaining particles can be adhered by the leaves, and the number of Pbcontaining particles on leaves was higher under the severe than the low pollution treatment. The content of Pb was the highest in leaves, while lower in stems and roots under both the low and severe pollution treatments. However, there were some differences in the transportations of Pb from leaves to stems and roots between the two treatments. In the low pollution treatment, Pb was transported from leaves to stems and roots 3 and 7 days after the treatment, respectively. By contrast, Pb in leaves was transported to roots only 3 days after the severe pollution treatment. Ultramicroscopic observation indicated that Pbcontaining particles first appeared in the cell wall of leaf epidermal cells, and was then transported to mesophyll cells through apoplast. In the mesophyll cells, Pbcontaining particles were mainly distributed in cell wall and cytoplasm, with a few particles observed in vacuole. The stomatal aperture, MDA and proline content, and SOD activity in P. euramericana leaves exhibited adaptive changes with the extension of time under both low and severe Pb pollution treatments. Our results demonstrate that Pb in PM2.5 particles could be adhered and absorbed by the leaves of P. euramericana, and P. euramericana can adapt to Pb pollution through decreasing stomatal aperture, osmotic adjustment and increasing oxidation resistance.
Key words: rain flooding, ecological suitability, ordered weighted averaging, urban growth boundary, scenario analysis.
CAO Xue-hui, AN Hai-long, LIU Qing-qian, LIU Chao, GUO Hui-hong, YIN Wei-lun, XIA Xin-li**. Adhesion and absorption of Pb in PM2.5 and adaptative changes in Populus euramericana ‘Neva’.[J]. cje.
0 / / Recommend
Add to citation manager EndNote|Ris|BibTeX
URL: https://www.cje.net.cn/EN/abstract/abstract22297.shtml
https://www.cje.net.cn/EN/Y2015/V34/I12/3382