Survey of three abandoned pastures in Gesäuse National Park

This thesis deals with three old, abandoned alpine pastures of the Eggeralm, the Ebersanger and the Wolfsbauernhochalm as well as their vegetation development after the cultivation change. In the course of the thesis, more than 170 vegetation sociological images were carried out in the summer of 2006 according to a slightly modified brown-blanquet scale, the results of which were evaluated as vegetation tables and finally processed into three vegetation maps. These are the main content of the diploma thesis. The second part of the thesis deals with the analysis of orthophotos of the years 1954 and 2003, in which questions regarding vegetation tendencies and cover-ups are answered during this period. Chapter 6 discusses the factors influencing succession as well as the processes in the three study areas, which show great differences in altitude, slope inclination, exposure and former use.本论文以埃格阿尔姆（Eggeralm）、埃伯桑格（Ebersanger）及沃尔斯巴恩霍赫阿尔姆（Wolfsbauernhochalm）三处废弃多年的高山牧场为研究对象，探讨其在耕作方式转变后的植被演替进程。研究于2006年夏季采用经小幅改良的布朗-布朗凯（Braun-Blanquet）等级法，完成了170余组植被社会学样方调查；调查结果经整理形成植被数据表，并最终绘制为三张植被分布图，上述内容为本毕业论文的核心主体内容。 本论文的第二部分围绕1954年与2003年的正射影像（orthophoto）分析展开，针对该时段内植被演替趋势与覆盖变化相关问题进行解答。第六章探讨了三处研究区域的演替影响因子与演替过程，这三处研究区域在海拔、坡度、坡向及既往土地利用方式上均存在显著差异。