不同环境中树叶的磁学性质及其对大气环境污染的指示

Magnetic Properties of Tree Leaves in Different Environments and the Indication for Atmospheric Environment Pollution

为了研究树叶的磁学性质对大气环境污染的指示作用,对安徽省凤阳县城、水泥厂和石英砂厂生长的杨树叶及在凤阳县城生长的银杏树、梧桐树等树叶的磁学参数进行测量。结果显示树叶样品中主要磁性矿物都是磁铁矿,粒径较大;但不同环境生长的杨树叶中磁性矿物含量存在差异,由高到低依次排列为水泥厂、凤阳县城、石英砂厂,指示水泥厂大气环境污染较凤阳县城和石英砂厂严重。进一步分析还发现在凤阳县城采集的杨树、银杏树、梧桐树等树叶样品中磁性矿物含量各不相同,其中银杏树叶中磁性矿物含量高于杨树和梧桐树树叶。利用树叶磁学参数能监测大气环境污染,但不同树种树叶的磁学参数对大气环境污染的指示作用存在差异。

In order to study the indicating effect of tree leaves’ magnetic properties on atmospheric environment pollution, magnetic parameters were measured on the poplar tree leaves collected from the downtown of Fengyang County, Anhui Province, cement plant and quartz sand plant of Fengyang, and ginkgo tree leaves and phoenix tree leaves grown in the downtown of Fengyang County. Results showed that the main magnetic mineral in tree leaves was magnetite, and its particle was coarse; the magnetic mineral content of poplar tree leaves in different environment was not the same, ranking from high to low as cement plant, Fengyang County and quartz sand plant, which indicated that the degree of atmospheric environment pollution in cement plant was more serious than than in the other two sites. Further analysis suggested the magnetic mineral contents of poplar tree leaves, ginkgo tree leaves and phoenix tree leaves collected from the downtown of Fengyang County differed from one another, and that of ginkgo tree leaves was higher than those of the other two. Thus, using magnetic parameters of tree leaves can monitor the atmospheric environment pollution, while the indication effect of different species leaves exists difference.