The Effect of Pine Stands and their Fertilization with Nitrogen on the Chemistry of the Water of Sources

1986

S. 189-220

3 Abb., 10 Tab., 17 Lit. Ang.

Unselbständiges Werk

200010862

Research into the influence of the fertilizing of pine stands with ammonium nitrate and limestone (120 kg N per hectare) was carried out on the catchment areas in the Druztova Forest in the Plzen - Bila Hora Forest Enterprise. The chemistry of the water was studied in surface sources of both fertilized and unfertilized catchment areas. The calibration period showed that the concentration of the individual elements or ions studied did not differ basically in the sources of the two catchment areas. After the application of nitrate during rainy weather there was an increase in NO3- of up to 65 mg.1-1 and in NH4+ to 3.40 mg.1-1. The concentrations of NO3- dropped rapidly and in the course of two weeks reached the values ascertained in the calibration period. The drop in the values of NH4+ took longer and it was not until nearly a month later that the concentrations of ammonium ions were lower than 1 mg.1-1. This increase was caused by contamination of the soaked soils of the source area and the surroundings of water streams and rainy weather during and after the application of fertilizer.