油葵种植条件下镉生物可利用性对柠檬酸诱导的响应研究

马欢欢; 乔冬梅; 齐学斌; 胡 超

引用本文:	马欢欢,乔冬梅,齐学斌,等.油葵种植条件下镉生物可利用性对柠檬酸诱导的响应研究[J].灌溉排水学报,2017,36(4):.
	MA Huanhuan,QIAO Dongmei,QI Xuebin,et al.油葵种植条件下镉生物可利用性对柠檬酸诱导的响应研究[J].灌溉排水学报,2017,36(4):.

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油葵种植条件下镉生物可利用性对柠檬酸诱导的响应研究
马欢欢，乔冬梅，齐学斌，胡超
中国农业科学院农田灌溉研究所，河南新乡 453002；中国农业科学院河南新乡农业水土环境野外科学观测试验站，河南新乡 453002

摘要:

采用盆栽试验的方法，以油葵为试验材料，分别在油葵生长20、30、40和50 d加入不同质量摩尔浓度（1、2、3、4、5和6 mmol/kg）的柠檬酸，研究柠檬酸对镉生物可利用性的影响。结果表明，柠檬酸的加入提高了镉的生物可利用性，在油葵生长20 d和30 d时加入1、2、3、4、6 mmol/kg的柠檬酸最有利于非活性的镉转化为易被生物利用的活性镉；在柠檬酸的诱导下，镉的富集系数均高于对照，在油葵生长40 d和50 d时加入1 mmol/kg的柠檬酸后镉的富集效果达到最优；在油葵生长50 d加入4~6 mmol/kg的柠檬酸能使镉的转运系数达到最大，最有利于镉由植物地下部分向地上部分转移。可见，在油葵生长20 d和30 d时加入1、2、3、4、6 mmol/kg的柠檬酸、油葵生长40 d时加入1 mmol/kg的柠檬酸、油葵生长50 d时加入4~6 mmol/kg的柠檬酸最有利于油葵对镉的吸收和富集。

关键词: 有机酸；镉；油葵；富集

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Bioavailability of Cadmium to Oil Sunflower after Addition of Organic Acids

MA Huanhuan, QIAO Dongmei, QI Xuebin, HU Chao

Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;.Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City Henan Province, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China

Abstract:

Pot experiments grown with oil sunflower were conducted to investigate the impact of citric acid on bioavailability of cadmium. Citric acid at concentrations of 1, 2, 3, 4, 5 and 6 mmol/kg was added to the pots 20, 30, 40, 50 d after the sunflowers were planted. The results showed that citric acid enhanced the bioavailability of cadmium. Adding citric acid 20 d and 30 d after the planting was most efficient to increase the bioavailability of cadmium. The accumulation coefficient of cadmiumin the plant under all citric acid treatments was higher than that in the control, peaking by adding 1 mmol/kg citric acid after the plant grew 40 d or 50 d. The transfer coefficient was maximum by adding 4, 5 and 6 mmol/kg citric acid after the plant grew 50 d. Organic acids can enhance the movement of cadmium from the below-ground to the above-ground. In conclusion, our results indicated that adding citric acid at concentration of 1, 2, 3, 4, 5 and 6 mmol/kg after plant grew 20 d and 30 d, then adding another 1 mmol/kg citric acid when plant was 40 d, and finally adding a further 4~6 mmol/kg citric acid at 50 d considerably improved the uptake of cadmium by oil sunflower.

Key words: organic acid; cadmium; canopy; accumulation