Dynamics of phosphorus pools in drainage ditch sediments within an agricultural catchment

Hydrological dynamics in drainage ditch sediments may impact phosphorus (P) retention and its potential (re-)release to connected waters. We aimed at understanding the fate of P in drainage-ditch sediments under dynamic environmental conditions (i.e., drying-rewetting cycles) by examining P pool transformations through an isotopic labelling and incubation experiment. Fresh sediment samples of a drainage ditch were labeled with 18O-enriched inorganic P (Pi), followed by a twenty-four-week incubation under different environmental conditions. A five-step sequential extraction scheme was combined with δ18O analysis of Pi (δ18O Pi) to follow changes in the operationally defined P pools. Few P pools showed significant changes, but time-resolved results revealed a dynamic interplay between redox conditions, microbial activity, and P dynamics. A subsequent decline in microbial P concentrations suggested cell death and reduced microbial activity, likely caused by hydrological stress. The δ18OPi ..., , # Data from: Dynamics of phosphorus pools in drainage-ditch sediments within an agricultural catchment.

### Authors: Christiane Nagel, Harald Neidhardt, Yvonne Oelmann

Description: This dataset represents the results of an isotope-labelling and laboratory incubation experiment aiming to reveal dynamics of phosphorus pools in drainage-ditch sediments.
The data were checked for normal distribution (Shapiro-Wilk test, p > 0.05) and homogeneity of variances (Levene´s test; p > 0.05). Repeated Measures ANOVA was used to test differences within a treatment across the different time points (significance level: 0.05). One-way ANOVA was used to test differences between the treatments for each of the dependent variables (P pools, Pmic, APA, Δ18OPi). A non-parametric LSD post-hoc test (Least Significant Difference) was applied if required. To determine mean differences between two pairs or time points, a paired t-test was used.

### Files:

Data_DrainageDitch_2021_csv.csv

Data folder: Includes ...,