摘要
测定了水溶液和 4种土壤 (红壤、草甸棕壤、暗棕壤和栗钙土 )条件下 ,铜、锌、铅、镉单一污染对白菜种子发芽与根伸长的抑制率 ,以及暗棕壤条件下重金属的复合污染效应 .结果表明 ,同一浓度下 ,重金属对白菜根伸长抑制率均明显大于对种子发芽抑制率 .重金属在土壤中对白菜根伸长抑制效应明显低于其在水体中的抑制效应 ,这表明土壤对重金属污染有重要的缓冲作用 .铜、锌、铅、镉污染对白菜根伸长抑制率与土壤有机质和土壤氮含量显著负相关 ;但与土壤 pH和土壤钾含量的相关性不显著 .铜、锌、铅、镉单一污染对白菜根伸长为刺激作用浓度下 ,复合污染即产生明显的协同作用 。
The Eco toxicity effects of individual Cu, Zn, Pb and Cd on the inhibition of seed germination and root elongation of Chinese cabbages ( Brassica pekimensis ) were tested in four types of soils (red loam soils, meadow brown soils, chestnut soils and dark brown soils) and water solution. The combined effects of heavy metals pollution were determined with meadow brown soils. Results indicated that with same concentration, the inhibition rates of heavy metals on root elongation of Chinese cabbages are stronger than that on the seed germination. The inhibition effects of heavy metals on the root elongation of Chinese cabbages in soils are much lower than that in water, indicating that soils play an important role of buffering on heavy metals pollution. Inhibition rates of heavy metals on the root elongation (IRHMRE)of Chinese cabbages are significantly negative related with the contents of organic matter (OR) and Kjedahl nitrogen (K N) in soils, however, there is no significant related between IRHMRE and soil pH, so does the content of T K. In the concentrations that result in the irritated effect in the single form of Cu, Zn, Pb and Cd pollution, synergic effects are produced significantly when four heavy metals are combined. As the results, the threshold values that result in the inhibition effects on root elongation in Chinese cabbages decrease markedly.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2002年第1期103-107,共5页
Environmental Science
基金
中国科学院知识创新工程项目 (KZCX2 40 1)
973资助项目 (G19990 1180 8)
