The most important ecological factors influencing distribution of endangered species (Anagyris foetida L.) inGilan-e-Gharb region
Document Type : Research Paper
Authors
دانشگاه کردستان
Abstract
In order to determine the most important ecological factors affecting distribution of Anagyris foetida, 12 research areas in the Gilan-e-Gharb of Kermanshah province were selected. Sampling of vegetation of each treatment was performed using random- systematic sampling in 20 × 20 square-meter plot and a plot of 1 × 1 m square was applied for understory sampling. Soil samples were taken at a depth of 50 cm in each plot at the foot of the plant and between the plants. Once in the laboratory, some soil physical and chemical properties such as clay, silt, sand, gypsum, lime, electrical conductivity, pH, phosphorus, calcium, magnesium, percentage of stones and pebbles, nitrogen, carbon and potassium were measured. For analysis of the soil and vegetation analysis of variance was applied and, in order to determine the effect of environmental factors on the density and volume of Anagyris foetida covers, the multivariate regression was used. The analysis of variance demonstrated that the factors of slop, pH, magnesium, potasium, nitrogen, clay, sand, canopy, density and size of the habitat have a significant difference at the level of 1% .Regression analysis also showed that 89 percent of the variation in species Anagyris foetida could be justified by nitrogen and slope for the density of the canopy, and N and sand present justified about 50% of the changes in volume of canopy.
Keywords
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