Nan Zhongren, Li Jijun, Zhang Jianming, Cheng Guodong
State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou, PR China.
Sci Total Environ. 2002 Feb 21;285(1-3):187-95. doi: 10.1016/s0048-9697(01)00919-6.
The transfer of Cd and Zn from calcareous soils nearby a non-ferrous mining and smelting bases to the spring wheat (Triticum aestivum L.) and corn (Zea mays L.) tissues and the interactions between the two metals concerned were investigated under actual field conditions. Samples of soils and entire crops were randomly collected during harvest time in 1998 in the Baiyin region. The soil metal contents showed that the furrows had been polluted (mean values: 3.16 mg kg(-1) for Cd; 146.78 mg kg(-1) for Zn) and the significant spatial variation of the soil contamination existed here (ranges, Cd: 0.14-19.3 mg kg(-1); Zn: 43.5-565.0 mg kg(-1)). The translocation ratios of the two metals from soil to crop parts in the region studied were relatively lower and the order of the element transfer in different plant tissues was root > stem > grain. The transfer ratio of element Cd was lower than that of element Zn. Cd and Zn uptake by the crop structures could be best described by four models (P < 0.01): linear; exponential; quadratic; and cubic. Apart from a linear relationship between the element Cd in the corn grains and soils, models were generally non-lincar. An analysis of Cd-Zn interaction mechanism led to the conclusion that the effects of the two metals were synergistic to each other under field conditions, in which increasing Cd and Zn contents in soils could increase the accumulations of Zn or Cd in the two crops.
在实际田间条件下，研究了有色金属采矿和冶炼基地附近石灰性土壤中镉（Cd）和锌（Zn）向春小麦（Triticum aestivum L.）和玉米（Zea mays L.）组织的转移以及这两种相关金属之间的相互作用。1998年收获季节，在白银地区随机采集土壤和整株作物样本。土壤金属含量表明，犁沟已受到污染（平均值：Cd为3.16 mg kg⁻¹；Zn为146.78 mg kg⁻¹），且这里土壤污染存在显著的空间变异（范围，Cd：0.14 - 19.3 mg kg⁻¹；Zn：43.5 - 565.0 mg kg⁻¹）。在所研究区域，这两种金属从土壤到作物各部分的转运率相对较低，不同植物组织中元素转移顺序为根＞茎＞籽粒。元素Cd的转移率低于元素Zn。作物各结构对Cd和Zn的吸收可用四种模型进行最佳描述（P＜0.01）：线性；指数；二次；和三次。除了玉米籽粒中元素Cd与土壤之间存在线性关系外，模型一般为非线性。对Cd - Zn相互作用机制的分析得出结论，在田间条件下，这两种金属的效应相互协同，土壤中Cd和Zn含量增加可使两种作物中Zn或Cd的积累量增加。
