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以天津市主要绿化树种为研究对象,对叶片中重金属元素含量和S进行了分析。结果表明:不同树种叶片吸滞As含量最多的是白蜡(143.48mg/kg),最小是杨树(121.80mg/kg);吸滞Cd含量最多是桧柏(1.05mg/kg),最小的是槐树(0.27mg/kg);吸滞Cr含量最多的是杨树(15.98mg/kg),最小的是龙柏(11.65mg/kg);吸滞Cu含量最多的是白蜡(41.85mg/kg),最小的是龙柏(20.20mg/kg);吸滞Pb含量最多的是白蜡(47.01mg/kg),最小的是杨树(35.39mg/kg);吸滞S含量最多的是柳树(7.96g/kg),最小的是龙柏(1.44g/kg);元素含量的最高值与最低值相差在1~6倍之间,排序基本为:S>Cu>Cd>Cr>Pb>As;不同季节叶片中Pb和Cr含量差异性较高,龙柏中冬季Cr含量为秋季的8.90倍,冬季Pb含量为夏季的13.72倍,相差最大。结合四个季节的平均数据,不同绿化树种对重金属元素和S元素吸滞能力总排序为:白蜡>槐树>雪松>柳树>龙柏>杨树>桧柏。
Taking the main green tree species in Tianjin as the research object, the content of heavy metal elements and S in leaves were analyzed. The results showed that the most abundant As in the leaves of different species was Ash (143.48mg / kg), the smallest was Poplar (121.80mg / kg), the highest Cd (Cd) content was Garnet (1.05mg / kg) (0.27 mg / kg). Poplar (15.98 mg / kg) and Populus apiaceae (11.65 mg / kg) were the most absorbed Cr, while wax (41.85 mg / kg) ), The smallest was Cypress (20.20mg / kg); the most Pb in sediment was white wax (47.01mg / kg) and the smallest was poplar (35.39mg / kg) 7.96g / kg), and the smallest was Cypress (1.44g / kg). The highest and lowest values of elemental contents varied from 1 to 6 times, with the order of S> Cu> Cd> Cr> Pb> As The differences of Pb and Cr contents in leaves were higher in different seasons. Cr content in Cypress was 8.90 times in winter and Pb content in winter was 13.72 times in summer, the difference was the largest. According to the average data of four seasons, the total sorting ability of different greening tree species on the sorption capacity of heavy metal elements and S elements is as follows: ash> Ash> Cedar> Willow> Cypress> Poplar> Cypress.