Evaluation of the effect of elevation and vegetation type on carbon sequestration in rangeland ecosystems of North Sabalan

Lazemi Zare, Sima (2017) Evaluation of the effect of elevation and vegetation type on carbon sequestration in rangeland ecosystems of North Sabalan. Masters thesis, University of Mohaghegh Ardabili.

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Text (تعیین اثر تغییرات ارتفاع و تیپ پوشش گیاهی بر میزان ترسیب کربن خاک در اکوسیستم¬های مرتعی شمال سبلان) Sima Lazemi Zare.pdf Download (1MB) | Preview

Abstract

Increasing carbon sequestration in soil is a very good Method to reduce atmospheric Co2 concentrations and has a very important role in reducing climate change and air pollution. In recent years, this subject has attracted the attention of various Researchers. In this study, the carbon sequestration capacity and its relationship with physiographic characteristics of the area and physical and chemical characteristics of soil in sampling areas in northern Sabalan in six sites, including three sites of shrubs and three grassland sites in the northern slopes and three classes elevation (less than 2000, 2500-2000 and more than 2500 m), and soil sampling at depths of 0-15 and 15-30 cm were conducted. A random-systematic method was used to study vegetation variables. In this way, within each of the studied areas, at least three transects with a length of 100 m, located along each transect, were established 10 plots of 1 m2 (based on the distribution pattern of the plants). After determining the normality of the data and homogeneity of the variance of the data for general comparison of the two meadow and grassland types in terms of physiographic characteristics and coverage and soil of the region, and the interaction of factors (height and type of plant) from the two-way (GLM ). In order to compare the soil properties in the first and second depths, one-way analysis of variance (ANOVA) and comparison of mean treatments by Duncan's multiple range test were used to compare the soil horizons in terms of soil characteristics in each site using t-test and correlation. Between the amount of organic carbon of soil with physiographic properties and soil area using Pearson correlation test and model Stepwise regression was performed using SPSS 17 software and Excel software was used to plot the graphs.The results of analysis of variance (GLM) indicate that there is a significant difference between the habitats in terms of physiography and soil. Accordingly, vegetation type and elevation have a significant impact on the characteristics of the region. The interaction of these two factors was also significant. Analysis of variance was performed for two depths. In both depths, the characteristics of soil quality such as clay and silt, carbon and organic matter, carbon and particulate matter, nitrogen and soil carbon content were measured in grassland habitats with an altitude of more than 2500 m and grassland with an elevation of 2000 to 2500 m and grassland habitat-shrub with maximum elevation of 2500 m.In addition, the percentage of gravel, pH, and electrical conductivity was also observed in grassland-shrubland with an elevation of 2000-2500 m, and grassland-shrub with an elevation of more than 2000 m. Moreover, the results of t-test showed that carbon and organic matter, carbon and particulate organic matter characteristics, electrical conductivity, nitrogen and carbon content in the first and second horizons in grasslands with an elevation of 2000 to 2500 m and grasslands with an elevation of more than 2500 m and grass-shrublands with an elevation above 2500 m had significant differences. The results of correlation coefficient indicated that soil carbonation had a positive correlation with soil quality characteristics such as clay and silt, carbon and organic matter, carbon and organic matter, nitrogen, while soil gravity, acidity and soil electrical conductivity had a negative correlation. The results of stepwise regression analysis of organic carbon with physical and chemical factors of soil and physiographic factors of the region at first and second depth showed that at the first depth, organic carbon, bulk density, electrical conductivity, altitude, nitrogen and organic carbon particle and also, in the second depth the soil, the percentage of organic carbon, bulk density, organic carbon particle, silt percentage, slope and elevation were the main components affecting the organic carbon storage of soil, and other factors had no significant effect on the organic carbon content of soil.

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