水保所知识产出(1956---)知识库

Aims Residues of antibiotics such as oxytetracycline
(OTC) in soil can affect microbial compositions and
activities, thus affecting soil P availability, and conse-
quently plant P uptake and growth.
Methods A pot experiment was performed to grow al-
falfa 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(0and 25mgkg −1 ).AdditionofOTC slightly reduced P
concentrations in shoots and roots, but did not reduce
plant P content consistently. Increasing OTC dose sig-
nificantly reduced bulk soil alkaline phosphatase activ-
ity at 0P and strongly reduced rhizosheath tartrate
amount at all P doses.
Conclusions The effects of OTC on plant growth and P
uptake dependedon bothOTC and P doses insoil. 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.