Plant and Soil ( IF 3.9 ) Pub Date : 2021-01-30 , DOI: 10.1007/s11104-021-04840-0 Zekun Zhang , Rui Su , Chao Chang , Xiao Cheng , Qi Peng , Hans Lambers , Honghua He
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:
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。