• ISSN 1008-505X
  • CN 11-3996/S
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. DOI: 10.11674/zwyf.2008.0121
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. DOI: 10.11674/zwyf.2008.0121
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]. Journal of Plant Nutrition and Fertilizers, 2008, 14(1): 132-138. DOI: 10.11674/zwyf.2008.0121
Citation: 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]. Journal of Plant Nutrition and Fertilizers, 2008, 14(1): 132-138. DOI: 10.11674/zwyf.2008.0121

添加有机酸对土壤镉形态转化及苋菜镉积累的影响

Effect of malic acid and citric acid addition on Cd transformations in soil and Cd uptake in amaranth

  • 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。

     

    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 Cd-LMWOAs 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 25mg/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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