论文部分内容阅读
研究了污水处理下红树林对Cu、Pb、Zn、Cd4种重金属元素的吸收、累积、分布和循环。结果表明 ,林地表层土壤 4种元素的储量关系为Zn >Pb >Cu >Cd ;对土壤中 4种重金属富集能力的大小依次为桐花树 >秋茄 >白骨壤。该群落中Cu、Pb、Zn、Cd的现存累积量分别为 1 41 796、 4 55 967、1 2 2 0 2 2 4和 9 4 93mg/m2 ;年吸收量分别为 1 8 98、 1 6 4 3、 89 1 9和 0 39mg/m2 ;年归还量分别为 1 4 64、7 2 6、 59 2 9和 0 1 6mg/m2 ;年存留量分别为 4 33、 9 1 7、 2 9 2 0和 0 2 3mg/m2 ;周转期分别为 1 0、 63、 2 1和 58年。
The absorption, accumulation, distribution and circulation of heavy metal elements Cu, Pb, Zn and Cd in mangrove forest under sewage treatment were studied. The results showed that the reserves of four elements in surface soil of forestland were Zn> Pb> Cu> Cd. The order of enrichment of four heavy metals in soil was Aegiceras corniculatum> Candelilla> Avicennia marina. The existing accumulations of Cu, Pb, Zn and Cd in this community were 1 41 796, 4 55 967, 122 202 and 9 4 93 mg / m2, respectively; and the annual uptake of Cu, Pb, Zn and Cd was 1 8 98 and 1 64, respectively 3, 89 1 9 and 0 39 mg / m2, respectively; the annual restockings were 1464, 7264, 5929 and 016 mg / m2, respectively; and the annual restages were 4 33, 9 1 7, 2 9 2 0 And 0 2 3mg / m2; turnover period was 10, 63, 21 and 58 years respectively.