Subjects: Biology >> Botany >> Applied botany submitted time 2019-08-26 Cooperative journals: 《广西植物》
Abstract： As a critical part of wetland system in Guizhou plateau, lake Caohai plays important roles in the maintains of ecological balance,healthy and harmonious species diversity and the regional climate regulation. In order to stabilize the wetland and sustainable development resource,it is critical important to study the characteristics of heavy metals pollution in atmospheric deposition flux and pollution characteristics. By the susceptibility and tolerance of bryophytes to heavy metals, MossBag method was used to monitor the heavy metal pollution around the lake for seven heavy metals (Cu,Pb,Zn,Cd,Cr,As and Hg )analyses,and to provide a basic data for the ecological environment protection of Caohai.The contents of seven elements such as Cu, Pb, Zn, Cd, Cr, As and Hg were detected by ICP-MS and atomic fluorescence. The sediment flux was calculated. The principal component analysis and correlation analysis are applied to study their characteristicsand origin of such pollutants,while the ecological risks of these 7 heavy metals were evaluated using geoaccumulation index method. The study results showed that the heavy metals in atmospheric deposition fluxes of Caohai Lake was a significant difference. Among which Cu and Zn deposition fluxes are far higher Pb,Cd,Cr,As and Hg, reaching 21.43 μg•m-2•d-1 and 102.82 μg•m-2•d-1 with accounting for a large total deposition fluxes radio. The correlation analysis shows that there is a positive correlation between As and Cr, Zn and Cu, indicating they are from similar or same sources,with the same chemical and environmental behaviors.However,there is no significant correlation between other metals. Applying the geoaccumulation Index method,the following conclusions are reached: all seven heavy metals were seriously polluted, of which Cd was in the extremely high pollution level. Combing the study results with the characteristics and sources of heavy metal pollution around Caohai wetland, heavy metal pollutions were considered mainly caused by many factors,including industrial structure and production and life style, and even the leftover of primitive zinc smelting industry in the vicinity.
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