土壤重金属Cd在木薯中累积特征及产地环境安全临界值

【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1...

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Published in南方农业学报 Vol. 43; no. 3; pp. 345 - 348
Main Author 韦璐阳 蓝唯 林鹰 梁宏合 李鸿 甘志勇 陈强
Format Journal Article
LanguageChinese
Published 广西亚热带作物研究所,南宁,530001 2012
Subjects
土壤
安全临界值
木薯
累积特性
重金属Cd
累积特性
木薯
重金属Cd
土壤
安全临界值
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ISSN2095-1191
DOI10.3969/j:issn.2095-1191.2012.03.345

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Summary:【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。
Bibliography:45-1381/S
[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 shootleafroot.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 shootleafroot.At the concentration of 13.23 mg/kg Cd in soil,tuberous root of cassava was found safe for eating purpose.
cassava; soil; heavy metal Cd; accumlative characteristics; safety critical value
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）
ISSN:2095-1191
DOI:10.3969/j:issn.2095-1191.2012.03.345