Effect of Forest Roads-stream Crossings on Physical-Chemical Properties of Water

In this study, the effects of age and cut slope characteristics of forest roads were investigated on the water quality properties of streams in Hyrcanian forest of Darabkola (Mazandaran province).

Twelve points were randomly selected at four stations including road age (15 and 30 years) and cut slope (13, 15, 18 and 20%) and water and soil sampling was performed. Acidity, electrical conductivity, Total Dissolved Solids (TDS), Total Suspended Solids (TSS), nitrate, phosphate and ammonium were measured. Comparison of soil properties shows a significant difference at three points on the trench and at each station.

Results showed that the cut slope had a significant effect on all variables of the waterways. Among the studied variables of water quality, although pH and EC showed significant variations considering the utilization and road treatments, as the soil has many daily and temporary variations; definitive decisions cannot be made regarding the impact of utilization and characteristics of forest roads on them.

In conclusion, it can be stated that in the present study, the factors affecting the quality of waterways and the relative impact of anthropogenic and natural factors involved in water quality were determined. So, this study is a good starting point for further research on the details and objectives of forest management in order to preserve this ecosystem.