| 添加有机酸对土壤镉形态转化及苋菜镉积累的影响 |
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| 引用本文： | 范洪黎,王旭,周卫.添加有机酸对土壤镉形态转化及苋菜镉积累的影响[J].植物营养与肥料学报,2008,14(1):132-138. |
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| 作者姓名： | 范洪黎 王旭 周卫 |
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| 作者单位： | 1.中国农业科学院农业资源与农业区划研究所,农业部植物营养与养分循环重点开放实验室,北京 100081 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 植物根系分泌的低分子量有机酸能够与土壤中的镉形成镉–有机酸复合体，从而影响根际镉的移动性。本文通过添加有机酸对土壤镉形态转化的研究，阐明有机酸与镉生物积累的关系。采用盆栽试验及土壤培养等方法，研究了添加苹果酸、柠檬酸对赤红壤和黄棕壤中镉的形态转化以及超积累型苋菜天星米镉生物积累的影响。结果表明，与Cd 25 mg/kg处理比较，Cd 25 mg/kg＋苹果酸、Cd 25mg/kg＋柠檬酸处理对苋菜生物量未产生影响，但显著增加苋菜根系及地上部镉含量；添加苹果酸、柠檬酸处理显著降低土壤专性吸附态Cd含量，却显著增加了交换态Cd、碳酸盐结合态Cd和有机结合态Cd含量。说明添加苹果酸、柠檬酸还能够通过影响土壤镉形态转化而促进苋菜对镉的积累。
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| 关 键 词： | 苹果酸 柠檬酸 土壤镉形态 镉积累 苋菜 |
| 文章编号： | 1008-505X（2007）06-0132-07 |
| 收稿时间： | 2007-02-13 |
| 修稿时间： | 2007-04-29 |
Effect of malic acid and citric acid addition on Cd transformations in soil and Cd uptake in amaranth |
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| FAN Hong-li,WANG Xu,ZHOU Wei.Effect of malic acid and citric acid addition on Cd transformations in soil and Cd uptake in amaranth[J].Plant Nutrition and Fertilizer Science,2008,14(1):132-138. |
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| Authors: | FAN Hong-li WANG Xu ZHOU Wei |
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| Institution: | 1.Key Laboratory of Plant Nutrition and Nutrient Cycling of the Ministry of Agriculture,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China |
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| Abstract: | The low-molecular-weight organic acids(LMWOAs) secreted by plant roots can modify the mobility of Cd through formation of soluble complexes in the soil rhizosphere.Studies are needed to determine Cd transformations and bioaccumulations as influenced by organic acid addition.The present work highlights CdLMWOAs interactions with special reference to their plant availability.Pot experiment and laboratory culture were carried out to investigate the effect of malic acid and citric acid addition on transformations of Cd forms in latosolic red soils and yellow brown soils,as well as Cd accumulation in amaranth(c.v.Tianxingmi,a high Cd accumulator).Compared with Cd 25 mg/kg treatment,Cd 25 mg/kg malic acid,and Cd 25 mg/kg citric acid treatment had no effect on amaranth biomass,but significantly increased Cd accumulation in both amaranth root and shoot.Further,malic acid and citric acid addition could lower concentration of specific adsorbed Cd,but increase exchangeable Cd,carbonate bound Cd and organic bound Cd significantly.Above results demonstrated that malic acid and citric acid addition could significantly modify Cd forms to enhance Cd accumulation in amaranth. |
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| Keywords: | malic acid citric acid soil Cd species cadmium accumulation amaranth |
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