Biotope mapping Gesäuse — Part report mapping area Johnsbach incl. Humlechnergraben

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 Johnsbach UG, 520 biotopes were mapped, which were detected on 909 individual areas (increased number of individual areas due to vegetation mosaic on dolomite rocks). Biotopes, which are only partially within the UG, have been mapped out flat. As a result, the entire mapping area increased from 153.7 ha to 226.5 ha by 72.8 ha or just less than half the area. The area sizes of the individual biotopes range from 12 m (field wood) to just under 5 ha (Snowheide-Rotföhrenwald on the northern slopes of the Hellichten Stein to the Humlechnergraben). Due to the adjoining of four further investigation areas (Gseng, Kaderalblschüttgraben, Langgries, Enns) there are overlaps with these UGs in the area statistics. For example, the mouth of the Johnsbach is also described in the sub-report “Enns”, since a functional separation of these estuaries (or in the three other cases of the corresponding side trenches to the Johnsbach) is not possible.生境（biotope）制图按1:2000比例尺开展，最小制图生境面积为100平方米，最小生境宽度为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）中的生境作为制图单元。 影像数据依据萨尔茨堡生境制图规范（NOWOTNY与Hinterstoisser，1994）录入调查记录表，并存储于MS Access数据库中。依据《生境指令》（对应欧盟指令92/43/EEC的FFH-LRT）可划归为濒危生境类型和/或栖息地类型的生境，还需额外附上物种名录进行记录。此外，所有生境均从彩色正射影像图中完成数字化解译提取。本次大范围野外调查于2006年开展。 分类学依据FISCHER等2005年的研究成果；植被群丛分类学（syntaxonomy）参考WILLNER与GRABHERR 2007年、GRABHERR与MUCINA 1993年以及MUCINA、GRABHERR与WALLNÖFER 1993年的研究，并补充了WILLNER 2001年的相关成果。2005年，ELLMAUER的研究被用于明确《生境指令》项下的生境界定。 在Johnsbach UG范围内，共计完成520个生境的制图，这些生境分布于909个独立斑块中（独立斑块数量增加的原因是白云岩岩壁上存在植被镶嵌体）。仅部分位于该UG范围内的生境，按完整斑块进行了制图。受此影响，总制图面积从153.7公顷增至226.5公顷，增加了72.8公顷，增幅接近原面积的一半。单个生境的面积范围为12平方米（田边林）至不足5公顷（Hellichten Stein北坡至Humlechnergraben的Snowheide-Rotföhrenwald）。由于新增了Gseng、Kaderalblschüttgraben、Langgries、Enns四个调查区域，在面积统计中与这些UG存在重叠。例如，Johnsbach河河口同时被纳入Enns子报告中，因为无法对这些河口（或另外三种对应Johnsbach支流的情况）进行功能上的划分。