Investigation of effective ecological factors on distribution of Leucanthemum vulgare Lam. in Namin County

Samadi Khangah, Sahar (2017) Investigation of effective ecological factors on distribution of Leucanthemum vulgare Lam. in Namin County. Masters thesis, University of Mohaghegh Ardabili.

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Text (بررسی عوامل بوم¬شناختی مؤثر بر پراکنش گونه Leucanthemum vulgare Lam. در سطح شهرستان نمین) Sahar Samadi Khangah.pdf Download (507kB) | Preview

Abstract

The presence of invasive plants in rangelands prevents the establishment of decreaser plants, reducing the potential of ecosystems and changes ecological processes, and is a threat for the rangelands. The aim of this study was to investigation of effective ecological factors on distribution invasive species Leucanthemum vulgare Lam. in Fandoghlou rangelands at the Namin county of Ardabil province. Sampling was conducted by stratified random systematic method and two main sites including the presence (three locations) and absence (three locations) of L. vulgare were selected. In each sites, three sampling transects with a length of 200 meters and a distance of 100 meters from each other were selected. Along each sampling line, 10 plots of 1 square meter were established at a distance of 20 meters. In each plot, vegetation factors including density and canopy cover, production and associated species were recorded. In the beginning, the middle and the end of each transect, soil samples were taken to the depth of rootstock of rangelands plants. Then soil parameters were measured in the laboratory. Maps of elevation, slope, aspect, rainfall and temperature for sampling sites were prepared by the GIS. In order to, study the differences between the presence and absence sites of L. vulgare the independent t test was used. In addition, to determine the importance of the variables in different sites and the species distribution, Linear Discriminant Analysis was used. The results showed that there were significant different between the variables of aspect, electrical conductivity, magnesium, soluble sodium, phosphorus, lime, volumetric moisture content (p<0.01) and variables of potassium of soil and organic matter (p<0.05) in sites of presence and absence of L. vulgare. Moreover, there were not significant different between other variables in sites of presence and absence of L. vulgare. According to the results of the Linear Discriminant Analysis, the five determined functions 93, 4, 1.5, 0.9, 0.5 percent, respectively and totally 100% of the total variance of the data were affirmed. Finally, the results revealed that the assessing of presence and absence of L. vulgare, 15 factors including slope, aspect, rainfall, temperature, acidity, electrical conductivity, calcium, potassium, soluble potassium, soluble sodium, phosphorus, lime, organic matter, silt percentage and volumetric moisture content were effective. According to the results of this study and to prevent the wider distribution of this plant and further degradation of Fandoghlou rangelands, it is necessary to decide on the improvement and rehabilitation of these rangelands

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