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Title

THE EFFECTS OF FOREST ROAD TYPE AND SOIL CHEMICAL PROPERTIES ON ALNUS SUBCORDATA GROWTH (CASE STUDY: DARABKLA - MAZANDARAN)

Pages

 Start Page 45 | End Page 53

Abstract

 Road construction has negative environmental impacts such as forest area reduction in microclimate, destruction of natural drainage, soil degradation and river water sedimentation and light regime changes, pH, moisture, etc. The purpose of this research was to investigate the chemical properties of soils beside the roads and its effects on the GROWTH of Alder GROWTH on the roads type I and II. Darbkla Forests were studied in this research. To understand the studied effects, the stands inside the area were also measured and compared. Diameter at breast height and height of Alder trees were measured at the edge of the road type I and II and inside the stands. The soil chemical characteristics (N, CaCo3, Ca, C, P, K, Mg, EC and pH) were measured. Data analysis was performed in SPSS. The Results indicated that despite the difference between the amounts of nutrients in the soil bordering the roads type I and II, no difference was observed between the GROWTH parameters. Diameter at breast height was higher on the road side comparing inside the stand but only the organic carbon in the soil of roadside was higher than the stand. Although there was no significant difference in the concentration of soil elements upstream and downstream of the road, but the height of trees above the road was significantly higher than the down parts. The results showed that there was no much difference between the environmental impacts of these two types of roads. Since because of the environmental issues, roads of type II are constructed in some areas the type I is needed, in general, it can be said that roads of type I can be constructed in necessary areas under environmental standards.

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