Aims

Residues of antibiotics such as oxytetracycline (OTC) in soil can affect microbial compositions and activities, thus affecting soil P availability, and consequently plant P uptake and growth.

Methods

A pot experiment was performed to grow alfalfa in a loess soil with different doses of P (0, 25, 50, and 100 mg kg⁻¹) and OTC (0, 25, 50, and 100 mg kg⁻¹). Plant dry mass, shoot and root P concentrations, bulk soil and rhizosheath pH, rhizosheath carboxylates, and bulk soil alkaline phosphatase activity were determined.

Results

Shoot dry mass and root dry mass increased with increasing P dose, while shoot dry mass decreased with increasing OTC dose, especially at lower P doses (0 and 25 mg kg⁻¹). Addition of OTC slightly reduced P concentrations in shoots and roots, but did not reduce plant P content consistently. Increasing OTC dose significantly reduced bulk soil alkaline phosphatase activity at 0P and strongly reduced rhizosheath tartrate amount at all P doses.

Conclusions

The effects of OTC on plant growth and P uptake depended on both OTC and P doses in soil. High OTC dose had negative effects on shoot P uptake and growth, especially at lower P doses, while it had a positive effect on root growth at higher P doses.

中文翻译：

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土霉素对苜蓿根际植物生长，磷吸收和羧酸盐的影响

目的

土壤中抗生素的残留，例如土霉素（OTC）会影响微生物的组成和活动，从而影响土壤磷的利用率，进而影响植物对磷的吸收和生长。

方法

进行盆栽试验在黄土用不同剂量的P的增长苜蓿（0，25，50，和100毫克千克^-1）和OTC（0，25，50，和100毫克千克^-1）。测定了植物的干重，茎和根中的P浓度，块状土壤和根茎pH值，根茎羧酸盐和块状土壤碱性磷酸酶活性。

结果

随P剂量增加，茎干质量和根干质量增加，而随OTC剂量增加，茎干质量减少，尤其是在较低P剂量（0和25 mg kg ^-1）下。OTC的添加会稍微降低茎和根中的P浓度，但并不能持续降低植物P的含量。在0P时，增加OTC剂量会显着降低整体土壤碱性磷酸酶的活性，而在所有P剂量下，酒石酸根茎酒石酸的含量会大大降低。

结论

OTC对植物生长和磷吸收的影响取决于土壤中OTC和P的剂量。高OTC剂量对苗期P吸收和生长具有负面影响，尤其是在较低P剂量下，而对较高P剂量对根系生长有积极影响。