摘要
采用镉污染土壤-河砂-营养液联合培养的方法,研究了不同时期施铁对水稻根表铁胶膜中铁、镉含量的影响。选择水稻的分蘖、拔节、孕穗和灌浆4个时期,进行分期和各生育时期都施加铁的处理,在每个处理时期,设4个亚铁(Fe2+)水平分别为0、30、50和70mg·L-1,研究根表施铁浓度与水稻根表铁胶膜数量和吸附镉量之间的关系。结果表明,生长过程中取样测定的水稻根表铁胶膜铁含量,除个别处理外,都表现为施加铁的根表铁胶膜铁含量高于未施加铁的根表铁胶膜铁含量,尤其是孕穗期,随着施铁量的增加根表铁胶膜铁含量增加。成熟时测定,灌浆期处理的水稻根表铁胶膜铁的含量变化比较大,分蘖期和拔节期变化比较小。各生育时期都处理的根表铁胶膜铁含量以施加Fe2+50mg·L-1最高。水稻根系的含镉量,生长期间测定的结果是前期处理高于后期处理,而收获时测定的结果是前期和后期处理的根系含镉量趋于一致。各生育期都处理的根系含镉量以施加Fe2+50mg·L-1最高,与根表铁胶膜中含铁量相符。
The effects of different Fe 2+ concentrations(0,30,50and 70mg ·L -1 )on Fe and Cd contents in iron plaque of rice root at different growth stages(tillering,jointing,booting and fi lling)individually and continually were s tudied by a combined culture systemof Cd -polluted soil -sand -nutrient solution.The results showed that Fe contents in iron plaque in the treatments receiving Fe 2+ in nutrient solution culture were greater than that in control treatment (0mg ·L -1 )in solution culture,especially at both booting stage during rice growing period and after harvest.The change of Fe contents in iron plaque in the treatments at filling was greater than that in treatment at both tillering and jointing periods.The Cd contents in iron plaque of rice fo llowed the similar trend like iron.Fe contents in iron plaque in the treatments at all stages from t illering to filling were the highest at 50mg ·L -1 of Fe 2+ concentration compared with other Fe 2+ concentrations.Cd contents in rice root in the treatment at all stages fr om tillering to filling were well in accordance with Fe conte nts in iron plaque.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2004年第1期6-12,共7页
Journal of Agro-Environment Science
基金
农业部开放试验室资助项目
关键词
铁
水稻
根表铁胶膜
铁
镉
含量
根系
含镉量
iron plaque
Cd -polluted soil
growth period of rice
Cd content
Fe content
