تحليل اثر گذارترين ويژگي هاي خاك در سه رويشگاه مرتعي

The relationship of the most effective soil characteristics on canopy covers of range plants in three habitat types

To find the most effective soil properties on canopy cover of range plants, three rangeland type were selected with same elevation and geographical aspect. These habitat types include shrubland, grass-shrubland and grassland. The soil properties, including calcium, magnesium, phosphors, potassium, lime, ammonium, nitrate, organic material, pH, EC, bulk density, moisture, and soil texture were measured. The plant cover in each site in the representative stand was measured. The CCA and PCA were used in this study to obtain environment gradients and the most effective elements on the plant cover. The results showed that from the grassland to shrubland, organic material, potassium and silts were decreased, while pH and sands were increased. The most effective elements were organic matter and moisture in grassland, the nitrate and clay in grass-shrubland, and lime and sand in shrubland.