Assessment of the Vegetation State of Several Under-exploited Agrostis tenuis - Festuca

Abstract

The study of the grassland type Agrostis tenuis - Festuca rupicola from Valea Bistrei - Otelul Rosu has been necessary due to the great surfaces covered with grasslands from the studied area and due to the social and economic climate characterised by the orientation of the rural community from the adjacent area to agriculture after the failure of the former intensive industry.There have been studied two grassland plots of about 500 hectares, res pectively Gai and Scărisoara. The purpose of this research is to assess the state of the biodiversity and pastoral value of four Agrostis tenuis - Festuca rupicola  grasslands from the hill area. Also, there has been analysed the floristic composition and a series of ecological indexes, respectively humidity, soil reaction, temperature, light, and nitrogen. Other aspects taken in account were the life-forms spectres. The analysed grasslands are placed on Bistrei Valey, in the perimeter of the locality OÅ£elul Roșu, Caraș -Severin County. The researches have been developed during 2010-2012 period. The average elevation level in the studied area is 268 square meters. The soil from the studied area is brown type, with a pH comprised between 4.79 and 5.31. The rainfall amount is about 700 mm and the average temperature is 10 Celsius degrees. The management mode of these grasslands is extensive, the grazing period being 150 days per year. The analysed surfaces are characterised by the lack of the maintenance works, there being present erosion phenomena. The method used for the vegetation analysis is the linear point quadrate method (Daget et Poissonet, 1971), the data being used for the calculation of different ecological indexes and pastoral value. The pastoral value of the species is low in both plots due to the great contribution of the low economical values of the most of the species from the analysed grasslands.