16种城市绿化树种叶片中铁锰铜锌元素的含量特征

于2003年对昆明、思茅、丽江3市不同程度污染地段、不同季节16个绿化树种叶片中的铁、锰、铜、锌4种重金属元素的含量进行了测定。依据其结果进行分析,此16个城市绿化树种对Fe、Mn、Cu、Zn 4种重金属元素的吸收能力不同,叶片中Fe含量最高的树种是冬樱花;叶片中Mn含量最高的树种是咕山含笑;叶片中Cu含量最高的树种是冬樱花;叶片中Zn含量最高的树种是咕山含笑。4种元素总含量最高的树种是咕山含笑,为1 125.64 mg/kg;最低的是栾树,为324.05 mg/kg,相差达3.47倍。叶片中Fe和Cu含量的相关性达到极显著的水平,其他元素之间相关性均不显著。在石楠、麻栗坡含笑、滇润楠、天竺桂、云南拟单性木兰、杜英、山玉兰、冬樱花8个绿化树种中,有的树种叶片中Fe、Cu的含量与空气中可吸入颗粒物污染指数间有显著或极显著的正相关性,可做为监测树种;而此8个树种叶片中Mn、Zn的含量与污染指数间的相关性显著。

Contents of Iron,Manganese,Copper and Zinc in Leaves of Sixteen Urban Species

Contents of four heavy metal iron,manganese,copper and zinc in leaves of 16 urban species distributed at Kunming,Simao and Lijiang were measurated in 2003.The results showed that absorption ability of the leaves of these 16 tree species on four metal elements were different.Cerasus cerasoides is the species with the highest content of iron and copper elements in leaves,Michelia martinii is the species with the highest content of manganese and zinc in leaves.As far as the total content of four elements was concerned,Michelia martinii had the highest content of 1 125.64 mg/kg,and the Koelreuteria bipinnata had the lowest content of 324.05 mg/kg.The correlation between iron and copper was significant,whereas the correlation between other elements was not significant.The results also indicated that among the contents of iron and copper in the leaves of Photinia serrulata,Michelia chartacea,Machilus yunnanensis,Cinnamomum japonicum,Parakmeria yunnanensis,Elaeocarpus decipiens,Magnolia delavayi and Cerasus cerasoides,there was significant positive correlation between the iron,copper content and Air Pollution Index(API),and could be used as tree species for pollutant monitoring.There were significant correlation between zinc,manganese content and API.