六溴环十二烷对土壤酶活性、种子发芽率及根伸长的影响

发布时间：2018-06-12 10:12

本文选题：六溴环十二烷 + 酶活性　；参考：《环境化学》2017年01期

【摘要】：以水稻土配制不同浓度(0.2%、0.5%和1%)的六溴环十二烷污染土壤,采用容量法和磷酸苯二钠比色法测定土壤中过氧化氢酶和磷酸酶的活性,研究六溴环十二烷对土壤酶活性(过氧化氢酶、磷酸酶)的影响,并通过配制不同浓度梯度的六溴环十二烷培养液,研究六溴环十二烷溶液对玉米、菜心、白菜和萝卜种子发芽和根伸长的影响.结果表明,土壤过氧化氢酶活性随着六溴环十二烷浓度的增大呈现先促进后抑制的趋势,0.2%处理对其活性促进作用最大;而土壤磷酸酶的活性随着六溴环十二烷浓度的增大而增大.六溴环十二烷对菜心种子发芽表现出先抑制后促进的影响规律;玉米种子发芽率差异性不显著,萝卜种子发芽受六溴环十二烷的影响不大;对白菜种子发芽表现出明显的抑制作用.当处理浓度超过90 mg·L~(-1)时,与对照处理相比,六溴环十二烷对4种种子的根伸长均表现出明显的促进作用.总之,白菜种子发芽和根伸长对HBCDs最敏感,受其抑制程度较高.虽然高浓度HBCDs促进菜心和萝卜种子发芽,但其根伸长受抑制.HBCDs对土壤磷酸酶活性呈现激活作用,对过氧化氢酶呈现抑制作用.
[Abstract]:The soil contaminated by hexabromocyclododecane with different concentrations of 0.2% and 1% was prepared from paddy soil. The activities of catalase and phosphatase in the soil were determined by volumetric method and disodium phosphate colorimetry. The effect of hexabromocyclododecane on soil enzyme activity (catalase, phosphatase) was studied. Effects of Chinese Cabbage and Radish seed germination and Root elongation. The results showed that the activity of soil catalase increased with the increase of HBCD concentration. The activity of soil phosphatase increased with the increase of HBCD concentration. Hexabromocyclododecane (HBCD) had the effect of inhibiting seed germination at first and then promoting it, but there was no significant difference in germination rate between maize seeds and radish seeds, but the germination rate of radish seeds was not affected by HBCD. The germination of Chinese cabbage seeds was inhibited obviously. When the treatment concentration was more than 90mg / L, HBCD could obviously promote the root elongation of the four seeds compared with the control. In a word, seed germination and root elongation of Chinese cabbage are most sensitive to HBCDs and inhibited by them. Although high concentrations of HBCDs promoted germination of Chinese cabbage and radish seeds, root elongation was inhibited. HBCDs activated soil phosphatase activity and inhibited catalase activity.
【作者单位】：华南农业大学资源环境学院;
【基金】：国家自然科学基金(41471265) 广东省自然科学基金(2015A030313418) 广州市科技计划(2014J4100184)资助~~
【分类号】：X592

【相似文献】