首页> 中文期刊> 《生态与农村环境学报》 >不同玉米品种对重金属铅镉的富集和转运能力

不同玉米品种对重金属铅镉的富集和转运能力

         

摘要

Based on a pot experiment using 10 cultivars of maize from 10 different production areas, characteristics of the maize adsorbing and accumulating heavy metals, like Pb and Cd were studied. Results show that under combined Pb (400 mg·kg-1)and Cd (10 mg·kg-1) stress, the accumulation of Pb in maize varied with the growth stage, displaying de⁃creasing order of ripening stage>jointing stage>seedling stage, while the Cd accumulation in maize did, too, but displaying a different order, i.e. seedling stage>jointing stage>ripening stage. In addition, the distribution of Pb and Cd in the plant also varied, showing an order as root>stem>leaf>grain, which means that root was the main part where the heavy metals were accumulated. Obviously, the 10 cultivars of maize all exceeded the criteria for Pb (≤0�2 mg·kg-1 ) in grains speci⁃fied in the National Sanitation Standard of China ( NSSC) in content of Pb, while Cultivars Guangtian 3, Guoshenjun 79-5, Xinghuangdan 892, Jindan 51, and Beike 4 were under the criteria for Cd (≤0�1 mg·kg-1 ) in grain specified in the NSSC. The lowest accumulation of Cd was found in Guangtian 3, which suggested that this maize cultivar can be extraplot⁃ed to areas slight or medium in soil pollution.%通过土培试验研究了10个来自不同产地的玉米( Zea mays)品种对重金属铅和镉的累积特性。结果表明,重金属铅(400 mg·kg-1)和镉(10 mg·kg-1)复合胁迫条件下,玉米不同生育期累积铅的能力从大到小依次为成熟期、拔节期和苗期,累积镉的能力从大到小依次为苗期、拔节期和成熟期。玉米各部位铅镉吸收量从大到小依次为根、茎、叶和籽粒。供试的10个玉米品种中籽粒铅含量均超过GB 2715—2005《粮食卫生标准》中的规定(≤0�2 mg·kg-1),广甜3号、国审浚79-5、兴黄单892、晋单51和北科4号籽粒镉含量符合GB 2715—2005中的卫生标准(≤0�1 mg·kg-1)。其中,广甜3号对镉的累积量最小,可以在中、轻度污染土壤上推广种植。

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