جستجوی مقالات مرتبط با کلیدواژه « گونه stipagrostis » در نشریات گروه « جغرافیا »

Understanding the environmental factors is considered as an applied study aiming to shed light on edaphic and ecological factors influencing the very labor ever and their management. In the hills and sandy desert land with soil conditions grow special plants. In the current research the relationship between the physicochemical properties of the soils and growth characteristics of the S. pennant. In the current research the relationship between the physicochemical properties of the soils and growth characteristics of the S. pennanta including density, canopy cover, height and cordage protean have been studied in the lands of the Sabzevar plain about 75 km southwest of the Sabzevar city.The climate of the study area is cold dry. Research A random systematic design has been applied in 4 sites called A, B, C, and D within a distincthabitat of S. pennanta. Soil samples have been taken from 2 depths (0 - 30 cm) and 30-60 and prop Hon of clay, silt and sand content, amount of N, P, K, C, Na, Ca, Mg,; in addition and PH have been determined in a soil lab. The soil physico–chemical and plant growth data have been analyzed through statistical methods using the SPSS software and Excel worksheet. Discussion and Vegetation consists type Salsola - Astragalus - Stipagrostis.The most important ecological factor for the growth and distribution of Sand plain desert region as a dominant species and communities of habitat, species Soil compatibility with sandy hair root sheath and the development of the root system in wide area network. The results indicated that the soil texture of the study area is predominantly sandy (more them 91%); it is concluded that for establishment of Spinet the soil of area should have at least 90% sand. However the sand amount of more than 90% dose of sand does not have signifying inflounce on the S. pennanta growth characteristics. Further finding of this study show that the growth characteristics of S. pennanta such as density, canopy cover, height and forage production rarely depend on soil chemical properties while they are mainly influenced by ecological factors. However, it should be mentioned that there is a statistically significant positive correlation between the canopy cover and amount of Ca. This has been shown by higher canopy cover in site B which has higher Ca. The results show that there is a direct relationship between the amount of nitrogen and Calsiom and canopy. This has been shown by higher canopy cover in site B which has higher Ca. The result showed that the S. pennanta height in all sites is nearly similar. The lower density of S. pennanta in sites C and D in comparison with sites A and B is mainly due to ecological factors such as existence of more accompanying species, hence more competition among species in sites C and D. In the presence of nitrogen and plant litter and nutrients that nitrogen source, the impact on plant growth and production. Research has shown that the macro elements and especially the nitrogen of the soil on plant growth is desert. Tangway (2004: 111) with degraded pastures Australian study using analysis of variance were the factors of soil organic carbon and nitrogen has the greatest impact on plant communities. According to the survey results, the comparison of habitat cow tail and a control area without cow's tail by Azarnivand and colleagues.This desirable species should be used to stabilize sand dunes and arid flowing from the pastures in the wilderness and desert, with some nitrogen and pH-neutral to slightly alkaline calcium are introduced.