Biotope mapping Gesäuse — Part report mapping area Enns

The biotope mapping was carried out on a scale of 1:2,000 from a minimum biotope size of 100 m with a minimum biotope width of 5 m. As mapping units, the biotopes were according to the “Red List of Endangered Biotope Types of Austria” (ESSL et al. 2002, 2004 & in Vorb.; Traxler et al. 2005) used. The images were documented in a survey sheet based on the biotope mapping Salzburg (NOWOTNY & Hinterstoisser 1994) and managed in an MS Access database. Biotopes that could be assigned to an endangered biotope type and/or habitat type according to the Habitats Directive (FFH-LRT according to Directive 92/43/EEC) were additionally documented with a list of species. Furthermore, the biotopes were digitally separated from colour orthophotos. The extensive terrain surveys took place in 2006. The taxonomy depends on FISCHER et al. 2005, the syntaxonomy according to WILLNER & Grabherr 2007, Grabherr & MUCINA 1993 and MUCINA, Grabherr & Wallnöfer 1993, supplemented by WILLNER 2001. Ellmauer was used to address the FFH habitats in 2005. In the Enns study area, 329 biotopes were mapped, which were detected on 457 individual areas. Biotopes, which are only partially within the UG, have been mapped out flat. Due to the unambiguous limitation of the UG by railway line or road over the majority of the area, the actual mapped area increased only to the west of the railway bridge, thus in the area Gesäuse Entrance and before it. The total mapping area increased by 12 % from 179.57 ha to 200.44 ha. The area sizes of the individual biotopes range from 30 m (Lavendelweidenau with Grauerle at Ennssteg) to 16.3 ha (uniform section of the Enns central in the Gesäuse).本研究以1:2000的比例尺开展生境斑块（biotope）制图，制图时设定生境斑块最小面积为100平方米，最小宽度为5米。本次制图以《奥地利濒危生境类型红色名录》（ESSL等，2002、2004及待刊；Traxler等，2005）中的生境类型作为制图单元。调查记录表以萨尔茨堡生境制图规范（NOWOTNY与Hinterstoisser，1994）为基础编制，所有相关影像资料均录入该记录表，并通过Microsoft Access（MS Access）数据库进行管理。对于可归类为《生境指令》（欧盟指令92/43/EEC规定的FFH-LRT）所定义的濒危生境类型或栖息地类型的生境斑块，需额外补充记录物种名录。此外，本研究通过彩色正射影像完成生境斑块的数字化勾绘。全面的野外调查工作于2006年开展。 本研究的物种分类学依据为FISCHER等（2005）的研究成果，群落分类学依据则参考WILLNER与GRABHERR（2007）、GRABHERR与MUCINA（1993）以及MUCINA、GRABHERR与WALLNÖFER（1993）的相关研究，并补充引用了WILLNER（2001）的成果。2005年，采用ELLMAUER提出的方法对FFH生境进行界定。 在恩斯（Enns）研究区内，共完成329个生境斑块的制图，这些斑块分布于457个独立地块中。仅部分处于UG范围内的生境斑块，均按完整地块进行制图。由于研究区大部分区域的UG边界由铁路或公路明确划定，因此实际制图范围仅延伸至铁路桥西侧，即格绍伊泽（Gesäuse）入口区域及其前方地带。总制图面积从179.57公顷增加至200.44公顷，增幅达12%。单个生境斑块的面积跨度为30平方米（恩斯斯特格旁的薰衣草河畔灰桤木林）至16.3公顷（格绍伊泽区域内恩斯河中部的连片生境）。