当前位置: 首页 > 文章 > 土壤重金属Cd在木薯中累积特征及产地环境安全临界值 南方农业学报 2012,43 (3) 345-348
Position: Home > Articles > Cd accumulation characteristics of cassava and its safe critical value in soil Journal of Southern Agriculture 2012,43 (3) 345-348

土壤重金属Cd在木薯中累积特征及产地环境安全临界值

作  者:
韦璐阳;蓝唯;林鹰;梁宏合;李鸿;甘志勇;陈强
单  位:
广西亚热带作物研究所
关键词:
木薯;土壤;重金属Cd;累积特性;安全临界值
摘  要:
【目的】研究土壤重金属Cd在木薯中累积与分配特性,探讨木薯在Cd污染土壤环境中的安全临界值。【方法】采用土壤盆栽试验,设6个土壤Cd浓度水平,测定不同土壤Cd浓度处理下木薯块根、茎叶的Cd含量,建立线性回归模型,并依据GB2762-2005标准模拟求出木薯在Cd污染土壤环境中的安全临界值。【结果】木薯根、茎、叶的Cd含量与土壤Cd浓度呈极显著正相关,整体分布特征为茎>叶>根。当土壤Cd添加量为25mg/kg时,木薯块根Cd含量达到0.22mg/kg,超过国家薯类作物的限量标准0.1mg/kg。模拟求出种植木薯的土壤Cd安全临界值为1.28mg/kg,以木薯块根为收获目标的土壤Cd安全临界值为13.23mg/kg。【结论】木薯对Cd累积规律为茎>叶>根,拟合求出以木薯块根为收获目标的土壤Cd安全临界值为13.23mg/kg。
译  名:
Cd accumulation characteristics of cassava and its safe critical value in soil
作  者:
WEI Lu-yang,LAN Wei,LIN Ying,LIANG Hong-he,LI Hong,GAN Zhi-yong,CHEN Qiang(Guangxi Subtropical Crops Research Institute,Nanning 530001,China)
关键词:
cassava;soil;heavy metal Cd;accumlative characteristics;safety critical value
摘  要:
[Result]Cd content in root,stem and leaf showed significantly positive correlation with Cd concentration in soil.The Cd accumulation in different parts of cassava presented shoot>leaf>root.Stems accumulated the highest Cd content,followed by leaves and roots.At 25 mg/kg Cd concentration in the soil,to the roots showed 0.22 mg/kg Cd content,violating the food safety standard(GB 2762-2005,Cd≤0.1 mg/kg).Safe critical value Cd was identified as 1.28 mg/kg for cassava plantation soils.At the concentration of 13.23 mg/kg Cd in soil,tuberous root of cassava were found safe for eating purpose.[Conclusion]The Cd accumulation in cassava presented shoot>leaf>root.At the concentration of 13.23 mg/kg Cd in soil,tuberous root of cassava was found safe for eating purpose.

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