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(P<0.01),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。
By using outdoor potted plants,we studied the enrichment and migration regularity of exogenous Cd in the applying sludge loess-wheat system. The results indicate the stress of exogenous Cd only has remarkable effect on the roots,and there has no significant impact on the stems,leaves and grains. The trends of the Cd contents in different parts of wheat are in following order: root stem and leaf shuck grain; Cd content in wheat and exogenous Cd are in significantly positive correlation( P 0. 01). The trends of Cd content in root and stem-leaf are consistent; when exogenous Cd content is 12. 0mg/kg,Cd content in root,stem and leaf reached the maximum,they are 34. 84mg/kg and 18. 98mg/kg,respectively. The change trends of Cd contents in shuck and grain are consistent,they both reached the maximum when the exogenous cadmium content is 9. 0mg/kg,they are 7. 11mg/kg and 3. 64mg/kg respectively. The trend of enrichment in different parts of wheat is: root stem-leaf shuck grain,and the order of transfer coefficient is stem-leaf shuck grain; the transfer coefficients is less than 1.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2017年第12期123-128,共6页
Journal of Arid Land Resources and Environment
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
关键词
污泥
黄土
小麦
CD
富集
迁移
sludge
loess
wheat
cadmium
enrichment
migration