广州地区“青山绿地”工程生态效益

The Ecological Benefit of the "Mountain Reforestation and Land Greening" Program in Guangzhou

研究了广州地区城市绿地系统森林植物-土壤系统生物同化、吸储、固定C,P,K,SO2,Pb,Cd的生态效益,结果表明:研究区域内绿地系统土壤中有机C储量最高达184t/hm2,最低为24.6t/hm2;TN储量最高达16.7t/hm2,最低为2.0t/hm2;Pb,Cd储量最高分别达837.4kg/hm2、3.9kg/hm2,最低分别为577kg/hm2、1.2kg/hm2;植物叶对SO2的积累量以高山榕最高,海芒果最低;小叶榕叶吸收固定Pb量最高为22.6g/hm2,尾叶桉叶和白玉兰叶吸收固定Cd量最高达0.15g/hm2。

The ecological benefit of bit〉logical assimilation, uptake and fixation of C, P, K, SO2, Pb and Cd of the plant-soil system in urban green land. Results indicated that： the highest reserve of soil organic C reached 184 t/hm^2 and the lowest was 24.6t/hm^2： the highest TN resetae was 16.6t/hm^2 and the lowesl was 2.0t/hm^2; the highest re.ryes ofPb. Cd was g37.4kg/hm^2 and 3.9kg/hm^2 respectively and the lowest was 577kg/hm^2： and 1.2kg/hm^2 respectively. The accumulation SO2 was the highest in leaves of Fieus altissinta and the lowest in Cerbera manghas. The highest uptake and fixation of Pb was 22.6g,： hm： in Ficus microcarpa, and the highest nptake and fixation of Cd reached 0. 15 g/hm^2 in the leaves of Eucalyptus urophylla and Magnolia heptapeta. Forests established by the project ＂Mountain reforestation and land greening＂are able to assimitate, uptake and fix polluting chemical elements. bringing good ecotogicat and environmental benefits.