广西罗汉果产区土壤铅的地球化学特征

Geochemical Characteristic of Lead in Soil From Siraitia grosvenorii Belt of Guangxi

对广西罗汉果产区8个地层土壤-罗汉果系统中铅含量进行检测分析,运用地质累积指数与单项污染指数法分别评价土壤、罗汉果铅污染程度。研究结果表明:所有地层土壤铅的地质累积指数评价均为"1级"、"无污染",土壤未受铅污染。8个地层的罗汉果果实单项污染指数均极低,无铅污染,为优质农产品与药用植物。Pt21地层罗汉果4个器官均未受铅污染,根、茎、叶、果部皆可采用。其余7个地层中均存在根、茎、叶某一器官不同程度铅污染。广西罗汉果产区罗汉果对铅具有极强的耐受性,生态环境优良。

The concentration of lead in soil-Siraitia grosvenorii system was investigated and the contamination was assessed with geoaccumulation index and single pollution factor index respectively in Guangxi province.The results show that all the geoaccumulation indexes are ‘1 grade'and ‘no pollution'. There is no lead pollution in soil from all formations. Fruits of Siraitia grosvenorii from 8 formations are not polluted with lead and are good-quality agricultural product and medical plant because all the single pollution factor indexes in 8formations are very low. The root,stem,leaf and fruit of Siraitia grosvenorii from Pt21formation can be safely used. The root or stem or leaf is polluted with lead in varying degrees in other 7 formations. The Siraitia grosvenorii has a very high level of tolerance to lead pollution and there is a good ecological environment in Siraitia grosvenorii belt in Guangxi province.