جستجوی مقالات مرتبط با کلیدواژه « زنوزچای » در نشریات گروه « جغرافیا »

Analyzing and summarizing data to map or demonstrate the extent، resources and watershed were carried out in a simple or complex series of ecological parameters. In the conventional methods in Iran، such series are called units or better environmental units. The method is based on a systematic analysis، and data analyzing and summarizing are conducted to perform a multivariate evaluation. In this method، considered parameters are integrated، so it will be possible to determine ecological boundaries on the map. In each ecosystem، existence of homogeneity among ecological resources formed the ecosystem elements (Makhdum، 2001). Power-PB (1998) studied the role of vegetation and watershed management in mountainous and hill watershed of Maharashtra in India. He concluded that in wide areas with biological cultivation and maintenance operations (from 1992 to 1996)، the plant survival was improved by 53. 33%، and water waste and erosion were declined nearly by 47% in mountainous shallow areas. In semi-deep soil، this value was about 23%. The decreased value of erosion in mountainous and hill region and high areas was estimated from 42. 68% up to 12. 79. The amount of harvest through technical operations like Contour Farrow was achieved between 30-35% and 32. 79% in hills and heights، respectively.