外源Cd在施污黄土-小麦系统中的富集迁移规律

发布时间：2018-06-07 20:51

本文选题：污泥 + 黄土　；参考：《干旱区资源与环境》2017年12期

【摘要】：以小麦和黄土为实验对象,通过室外盆栽试验研究了外源Cd在施污黄土-小麦系统中的富集迁移规律。结果表明:外源Cd的添加对小麦根部生长指标(根长、干重)产生了显著影响,对地上部的生长指标(株高、茎叶干重、籽粒干重)影响不显著;小麦各部位Cd含量总体趋势为根茎叶壳籽粒,且小麦各部位中Cd含量与外源Cd的添加量均呈显著的正相关关系(P0.01),籽粒中Cd含量也会随着外源Cd添加量的增加而增加,表明土壤中Cd含量可以用来预测小麦籽粒中Cd的含量。小麦根与茎叶中Cd含量变化趋势一致,在外源Cd添加量为12.0mg/kg时,根和茎叶中Cd含量达到最大,最大值分别为34.84mg/kg和18.98mg/kg;小麦壳与籽粒中Cd含量变化趋势一致,在外源Cd添加量为9.0mg/kg时达到最大值,最大值分别为7.11mg/kg和3.64mg/kg;小麦不同部位富集能力呈现根茎叶壳籽粒的趋势,不同部位迁移能力也不同,呈现茎叶壳籽粒的趋势,且迁移系数均小于1。
[Abstract]:Taking wheat and loess as experimental objects, the enrichment and migration of exogenous CD in Loess and Wheat system were studied through outdoor pot experiment. The results showed that the addition of exogenous CD had a significant effect on the root growth index (root length, dry weight), but had no significant effect on the shoot growth index (plant height, stem and leaf dry weight, grain dry weight). The general trend of CD content in different parts of wheat was rhizome, leaf, shell and grain, and there was a significant positive correlation between CD content and exogenous CD addition in wheat. CD content in wheat grain also increased with the increase of exogenous CD addition. The results showed that CD content in soil could be used to predict CD content in wheat grains. The CD content in roots and leaves of wheat was the same as that in stems and leaves. The CD content in roots and leaves reached the maximum value (34.84mg/kg and 18.98 mg / kg) when the content of exogenous CD was 12.0mg/kg, and the CD content in wheat shell and grain was the same. The maximum amount of exogenous CD was 7.11mg/kg and 3.64 mg / kg, respectively, and the accumulation ability of different parts of wheat showed the trend of rhizome, leaf shell grain, and different parts migration ability, which showed the trend of stem and leaf shell grain, respectively, when the content of external CD was 9.0mg/kg, the maximum value was 7.11mg/kg and 3.64 mg / kg, respectively. The migration coefficients are less than 1.
【作者单位】：兰州大学资源环境学院;
【基金】：国家自然科学基金项目(NSFC 51178209;NSFC 91025015) 兰州大学中央高校基本科研业务费专项资金项目(lzujbky-2014-279;lzujbky-2014-208;lzujbky-2016-261)资助
【分类号】：S512.1;X131.3;X173

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