^(14)C-林丹在人参土壤中的降解

DEGRADATION OF ^(14)C-LINDANE IN SOILS OF PLANTING GINSENG

本文应用^(14)C-林丹研究了γ-六六六在不同人参土壤中的降解。在模拟环境条件下,经过228天的观察发现,林丹在土壤中矿化降解十分缓慢,当土壤中浓度为20ppm时,达到完全矿化,估计黑钙土需要9年,棕钙土需要11年。此外,林丹在土壤中矿化的速率与微生物种群有关,真菌矿化林丹的能力大于细菌。林丹在土壤中的残留绝大部分以可溶态形式存在,约占总残留物的77.43％—80.54％,与土壤结合的仅为一小部分,即13.11％—20.77％。

14C-Lindane was used to study degradation of Lindane (γ-BHC) in different types of soil of planting ginseng.Results indicated that Lindane was very slowly mineralized after a 228 day's incubation period in closed system.It took about 9 years to mineralise completely Lindane in the chernozem,and 11 years in the brown calcareous at 20ppm in the soils.In addition,the rate of Lindane mineralized depended on population and number of microorganism.In this test the fungi played more important role than the bacteria in the Lindane mineralization.14C-Lindane residues extracted from the soils were 77.43%-80.54%,and Lindane residues associated with the soils were 13.11 %-20.77%.