摘要
采用温室盆栽试验研究了不同浓度Cd对紫花苜蓿分枝期和开花期的影响，同时对苜蓿的安全生产进行了评估。实验结果表明，在土壤含Cd量0．37～20．37mg／kg内，苜蓿分枝期生物量易受Cd影响，开花期则未受影响。苜蓿分枝期和开花期地上部Cd含量都与土壤Cd含量呈显著正相关，且分枝期要比开花期高出2．9～28．5倍。在土壤含Cd量5．37mg／kg时，苜蓿开花期地上部Cd含量为0．213mg／kg（干重，下同），未超出饲料卫生安全限定标准（Cd：0．5mg／kg，GB13078-2001），而分枝期Cd含量则超出饲料卫生安全限定标准。由拟合方程得出，紫花苜蓿分枝期土壤Cd含量不超过0．55mg／kg，开花期土壤Cd含量不超过9．37mg／kg时，苜蓿干草Cd含量不会超过饲料卫生安全限定标准。
Pot experiments were conducted to study the influence of cadmium pollution on the branching and flowering stages of alfalfa, and to evaluate the safety for production of alfalfa. The biomass of alfalfa was more easily affected by Cd at the branching than at the flowering stage with soil concentrations of 0. 37- 20. 37 mg/kg Cd. At both branching and flowering stages, the Cd contents in the body of the alfalfa plants were significantly positively correlated with Cd in the soils and at the branching stage were more than 2.9-28.5 times higher than at the flowering stage. At the flowering stage, the Cd contents of above-ground parts of alfalfa were 0. 213 mg/kg dry weight and did not exceed the forage health standards （Cd： 0.5 mg/kg GB 13078-2001） when Cd was 5.37 mg/kg in the soil. Compared with the flowering stage, at the branching stage, the Cd contents of above-ground alfalfa parts exceeded the forage health standard. The contents of Cd in soils should not exceed 0.55 mg/kg at the branching stage and 9.37mg/kg at the flowering stage according to the fitted equation. In the above situations, Cd contents of above-ground alfalfa parts did not exceed the forage health standard.
出处
《草业学报》
CSCD
北大核心
2009年第5期266-269,共4页
Acta Prataculturae Sinica
基金
河北省自然基金项目(C2007000459)资助
关键词
镉
苜蓿
不同时期
饲用安全
cadmium
alfalfa （Medicago sativa）
different stages
forage safety
