Forest-related landscape metrics in LandKlif project

We calculated forest-related landscape metrics which have influence on insect diversity. Based on the detailed Landklif map (dataset 11560 at LandKlif database, https://www.landklif.biozentrum.uni-wuerzburg.de), we classify coniferous forest, decideous forest, mixed forest, small wood, and transitional woodland-shrub as forest features. Sub land use class and origical classification was kept as well. This dataset includes the area percentage (landscape composition) of these classes as well as edge length between forest features and non-forest features, in a scale of 100, 200, 500, 1000, 1500 meter radius around the study plots, as well as in TK 25 quadrant scale. TK 25 quadrant is common name in Germany for the topographical map unit at a scale of 1:25000 designated by four-digit numbers, which has a long history (from 1875) and is been used as unit for geographical survey and biodiversity mapping (http://maps.snsb.info/TK25/). Detailed Landklif map was created by combining 3 different land cover maps to create a detailed land cover map for 6 km buffer area around landklif study plots. We used ATKIS 2019 land cover as basis, added details from Invekos 2019 and Corine 2018. We categorized the land cover into 6 classes, further subcategorized them into sub land use classes. The original classification from different sources are kept. In case of overlapping, the priority goes (from high to low): natural > forest > grassland > arable > urban > water. In case of overlapping between data source: transitional woodland-shrub from Corine > Invekos > ATKIS. Areas outside of Bayern are filled with only Corine data. The coordinate system of the shapefile is ETRS89 / UTM zone 32N (EPSG:25832). This dataset is not open access due to its sensitivity but can be reached (https://www.landklif.biozentrum.uni-wuerzburg.de/Download/ShowXml.aspx?DatasetId=11560) and requested via the LandKlif database. LandKlif is funded by the Bavarian State Ministry of Science and the Arts within the Bavarian Climate Research Network (bayklif). Within the five year funding period of bayklif, five interdisciplinary senior research associations and five junior research groups are be financed with a total sum of 18 million Euro. LandKliF, as one of the five interdisciplinary senior research associations, addresses the effects of climate change on biodiversity and ecosystem services in semi-natural, agricultural and urban landscapes.本研究计算了对昆虫多样性存在影响的森林相关景观指数。本研究基于详细Landklif地图（Landklif map，LandKlif数据库数据集11560，链接：https://www.landklif.biozentrum.uni-wuerzburg.de），将针叶林、落叶林、混交林、小片林地以及过渡性林地灌丛划定为森林地类，同时保留了次级土地利用分类与原始分类体系。本数据集包含各森林地类的面积占比（即景观组成），以及森林地类与非森林地类之间的边缘长度，计算范围涵盖研究样地周边100米、200米、500米、1000米、1500米半径区域，同时也包含TK25象限（TK25 quadrant）尺度下的对应指标。TK25象限是德国对1:25000比例尺地形图单元的通用称谓，该单元以四位数字编号，自1875年起沿用至今，长期被用作地理测绘与生物多样性制图的基本单元（链接：http://maps.snsb.info/TK25/）。详细Landklif地图（Landklif map）的制作方式为融合三款不同的土地覆盖地图，以生成Landklif研究样地周边6公里缓冲区内的高精度土地覆盖图。本研究以ATKIS 2019土地覆盖数据（ATKIS 2019）为基础，补充了Invekos 2019（Invekos 2019）与Corine 2018（Corine 2018）的细节信息。研究团队将土地覆盖划分为6个一级类，并进一步细分为次级土地利用类别，同时保留了各源数据的原始分类体系。当地类出现重叠时，优先级由高到低依次为：自然地类>森林>草地>耕地>城镇用地>水域；当不同数据源存在重叠时，过渡性林地灌丛的优先级为：Corine数据>Invekos数据>ATKIS数据。巴伐利亚州境外区域仅使用Corine数据填充。该矢量文件（shapefile）的坐标系为ETRS89 / UTM 32N（ETRS89 / UTM zone 32N，EPSG:25832）。本数据集因涉及敏感信息暂不开放获取，但可通过LandKlif数据库访问（链接：https://www.landklif.biozentrum.uni-wuerzburg.de/Download/ShowXml.aspx?DatasetId=11560）并申请使用。LandKlif项目由巴伐利亚州科学与艺术部资助，隶属于巴伐利亚气候研究网络（bayklif）。在bayklif的五年资助周期内，该网络共资助5个跨学科资深研究团队与5个青年研究小组，总经费达1800万欧元。作为五个跨学科资深研究团队之一，LandKlif聚焦气候变化对半自然、农业与城市景观中生物多样性及生态系统服务的影响。