Examination of Cd Accumulation Within Sunflowers Enhanced by Low Molecular Weight Organic Acids in Alkaline Soil Utilizing an Improved Freundlich Model
Examination of Cd Accumulation Within Sunflowers Enhanced by Low Molecular Weight Organic Acids in Alkaline Soil Utilizing an Improved Freundlich Model
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利用改进的 Freundlich 模型检查碱性土壤中低分子量有机酸增强向日葵内镉的积累
DOI：
10.1007/s42729-021-00551-8
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发表时间：
2021-08
影响因子：
3.9
通讯作者：
Yang Han
中科院分区：
文献类型：
--
作者：
Hongfei Lu;Yuru Huang;Dongmei Qiao;Yang Han
目的提高向日葵修复土壤中镉的效率，并对其进行优化。方法5种低分子量有机酸（LMWOAs）：草酸（OA）、乙酸（AA）、酒石酸（TA）、乙酸（AA）、乙酸（AA）。分别在向日葵种子出芽后20、30和40 d分别施用2、4和6 mmol/kg的苹果酸和柠檬酸。pH、电导率（EC）、总氮（TN）、总磷（TP）、过氧化氢酶活性、淀粉酶活性、结果2和4 mmol/kg施氮量能显著提高植物生物量。对每一次酸处理，Cd含量。根和叶增加，茎和芽减少。总Cd积累量也随着增加而增加。在植物生物量中，尤指根组织；幼苗出苗后20或30 d施用低分子woas可通过扩大根际土壤对Cd的吸收能力而获得较高的Cd积累。施药时间的影响更为显著。对植物生物量、Cd含量和植物组织积累的影响大于LMWOAs的变化。土壤转化酶活性和。pH值是引起Cd形态变化的主要因素。采用土壤EC和pH值的改良Freundlich模型具有较高的拟合性。结论低分子woas能增加植物体内Cd的积累，且施用剂量较低（2 mmol/kg），施用时间较早。苗期（出苗后20 d）有利于提高向日葵植物修复效率。的。根系生物量的增加扩大了植物与土壤的接触面积，这是土壤有机质含量增加的原因之一。Cd积累。当使用pH值时，EC可以作为补充指标来改进Freundlich模型。
Purpose This research aims to improve the efficiency of phytoremediation of Cd in soil using sunflowers and optimizing.the model of Cd uptake by plants..Methods Five low molecular weight organic acids (LMWOAs), oxalic acid (OA), acetic acid (AA), tartaric acid (TA),.malic acid (MA), and citric acid (CA) at 2, 4, and 6 mmol/kg, were applied to sunflowers at 20, 30, and 40 days after seed.emergence. The pH, electric conductivity (EC), total nitrogen (TN), total phosphorus (TP), catalase activity, amylase activity,.invertase activity, and Cd content in rhizosphere soil and Cd in plant tissues were analyzed..Results Plant biomass was greater at the application rates of 2 and 4 mmol/kg. For each acid treatment, the Cd content in.roots and leaves increased, while that of the stem and bud decreased. The total Cd accumulation increased due to the increase.in plant biomass, especially root tissues; LMWOAs applied at 20 or 30 days after seedling emergence achieved higher Cd.accumulations by expanding the Cd absorption capacity of rhizosphere soil. Application time had a more significant influence.on plant biomass, Cd content, and accumulation in plant tissues than the variation of LMWOAs. Soil invertase activity and.pH are the main factors causing the change in Cd form. An improved Freundlich model, using soil EC and pH, had higher.accuracy than a model using pH alone..Conclusions LMWOAs can increase Cd accumulation in plants, and a lower application rate (2 mmol/kg) and earlier application.date (20 days after seedling emergence) are beneficial for improving the phytoremediation efficiency of sunflower. The.increase of root biomass expanded the contact area between plants and soil, which was one of the reasons for the increase of.Cd accumulation. EC could be used as a supplementary index to improve the Freundlich model when using pH.
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