Document Type : Scientific article
Authors
1
Assistant Professor, Forests and Rangelands Research Department, Kurdistan Agricultural and Natural Resources Research and Education Center, AREEO, Sanandaj, I.R. Iran.
2
3- Associate Prof Prof., Research Inistitute of Forests and Rangelands
3
Scientific member, Forest Research Division, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
4
Research Expert, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, I.R. Iran.
Abstract
Oak decline in the Zagros forests has started in the last two decades and has caused serious damage to the forests of this vegetation area. The aim of this study was to investigate and compare the physical and chemical soil parameters in around healthy and dieback trees under the influence of slope and dieback in Marivan forests. Deteriorated (Garan) and control (Dolah Naw) stands were selected. In total, 30 healthy and dieback trees were selected and numbered. Then, in the vicinity of the trunk of each tree (in the shaded part of the crown), a soil sample was taken at a depth of 0-20 cm (Horizon A). The two-way analysis of variance test was used to compare the effect of each factor and the interaction effect of the investigated factors on the physical and chemical parameters of the soil. The findings showed that the highest average parameters of electrical conductivity, available phosphorus, potassium, organic carbon, nitrogen, and moisture were respectively 2.654 (d s m-1), 1.10 (mg/kg), and 869.5 (mg/kg). ), 4.03%, 0.35% and 12.4% were observed in the soil adjacent to the control trees in the northern slope and for magnesium, calcium and CaCO3 parameters of healthy trees in the southern slope with the values of 21 (meq/100), 42.2 (meq/100) and 13.60% was significantly more than other treatments. Based on the results, for the optimal management of dieback stands in the research area, increasing protection action and forest restoration and development programs in the dieback stands are recommended.
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