The effect of different types of land use on the physical, chemical and carbon deposition characteristics of the soil along the Karkhe River

despite occupying a relatively small space, the border forests have the potential to accumulate more and faster carbon, are centers of biodiversity and provide many valuable ecosystem services. Riverine forests also affect plant biodiversity patterns, soil characteristics, and habitat quality. Despite having high environmental and conservation values, the riverine forests have been paid less attention as forest covers, and most of the studies related to the distribution pattern of species and characteristics of the animal community It was their soil. The aim of this research was to investigated the effect of different types of land use on the physical, chemical and carbon deposition characteristics of the soil along the Karkhe River. In this research, the effect of natural forest uses, forestry, agriculture and barren lands on the banks of the Karkheh River on some physical and chemical characteristics and soil carbon deposition was done. Thus, by random method, 30 points were selected in each field and soil samples were taken from a depth of 0-20 cm in the center of each plot. The characteristics of moisture percentage, texture, specific gravity, pH, electrical conductivity, organic carbon, total nitrogen, absorbable potassium and phosphorus, and calcium carbonate were calculated in the measuring laboratory and the amount of carbon deposition. Data were analyzed using one-way analysis of variance (ANOVA) and SNK mean comparison test. All statistical analyzes were performed using SAS 9 software. The results showed that agricultural use with 18.45% clay, natural forest and agricultural use with 46.29 and 43.92% silt, respectively, and forestry and barren land use with 60.47 and 56.86% sand, respectively. They showed a significant difference. Apparent specific mass increased during forest use change. The highest value of electrical conductivity with 3.17 decisiemens/meter was observed in barren lands, which had an increase of 71.35% compared to the natural forest. In agricultural use, absorbable potassium reached the lowest level with a decrease of 62.04% compared to the natural forest. According to the results, the change of use has a significant and decreasing effect on the amount of carbon sequestration, so that the natural forest has the highest amount of carbon sequestration with 63.37 tons per hectare, and the lowest carbon storage related to agricultural use with 41.53 tons. It was per hectare. In general, the forests along the river have more quality and soil carbon deposition, and the change of land use causes damage to these habitats. Investigating carbon sequestration in coastal ecosystems may help determine baseline conditions and can be used to strengthen restoration plans or address the impact of climate change on carbon stocks in these areas.