作　　者： ; ; ;

机构地区： 华南农业大学资源环境学院农业部生态农业重点开放实验室

出　　处： 《农业环境科学学报》 2010年第2期223-228,共6页

摘　　要： 通过营养液沙培盆栽试验,研究了水稻幼苗的根长、株高和鲜重对高氯酸盐(ClO4-)、六价铬(Cr6+)及其复合污染(ClO4-+Cr6+)胁迫的响应。结果表明,随着污染物处理浓度的提高,ClO4-、Cr6+和ClO4-+Cr6+对水稻幼苗主要生长指标根长、株高和鲜重的抑制作用越明显,呈现出明显的浓度-效应关系;在同一浓度下,ClO4-、Cr6+和ClO4-+Cr6+对水稻幼苗根长、株高和鲜重的抑制率呈明显的时间-效应关系,处理时间越长,抑制率越高;复合污染对水稻生长的抑制效应大于其中任一污染物在同浓度条件下的单一污染的影响,且随着浓度和时间的增加,抑制作用也越明显;复合污染对水稻幼苗生长的交互作用类型因处理时间和浓度组合的不同而更趋复杂。 A pot experiment with sand cultivating was conducted to study the stress effects of different concentration levels of perchlorate（ClO4^- ） and hexavalent chromium （Cr^6＋） as well as their combination （ClO4^-Cr^6＋） upon rice seedling growth. Results showed that an increase in CIO4^-, Cr^6＋, and ClO4^-＋Cr^6＋ concentrations inhibited the root length, plant height and fresh weight of rice seedling significantly which showed dose-effect relationship. At the same concentration level, the inhibitory rate of rice seedling growth such as root length, plant height and fresh weight increased gradually as exposure time were raised, which showed time-effect relationship. The inhibition of the ClO4^-Cr^6＋ combined treatment were higher than that of individual ClO4^- or Cr^6＋ treatment. And as ClO4^-＋Cr^6＋ concentrations and exposure time were raised, the inhibitory rate increased obviously. The interactions between perchlorate and hexavalent chromium had complicated influences on its inhibitory rate of rice seedling growth under the condition of the binary mixture, which were dependent on their concentration combinations and exposure time.

关 键 词： 高氯酸盐 铬 复合污染 水稻 交互作用

领　　域： [环境科学与工程]