Alnus glutinosa chorology

Distribution map of black alder (<i>Alnus glutinosa</i>)<br><br>These maps were produced by combining numerous and heterogeneous data collected from atlas monographs providing complete species distribution maps, from national to regional atlases, occurrence geodatabases and scientific literature.<br>The maps were created using ESRI shapefiles (*.shp, *.shx, *.dbf, *.prj files) archived in the ZIP file. Species range is mapped with polygon features (name suffix “plg”), which define continuous areas of occupancy of the species, and with point features (name suffix “pnt”), which identify more fragmented and isolated populations. If synanthropic occurrences are reported outside the species natural range, additional point and/or polygon shapefiles are also present (suffix “syn”).<br>All polygon borders delimiting the range are generalized across the mainland and sea boundaries, and not clipped to a specific coastline. This offers the possibility to mask sea areas, or to clip and extract the terrestrial range parts using GIS data layers of the users’ choice. <br><br>Please cite as:<br>Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. Chorological maps for the main European woody species. Data in Brief 12, 662-666. DOI: doi.org/10.1016/j.dib.2017.05.007 <br><br>Additional information and used references are on 'supplementary materials' document:<br>https://doi.org/10.6084/m9.figshare.5091901<br><br>Chorological maps are part of the "European Atlas of Forest Tree Species" project:<br>https://w3id.org/mtv/FISE-Comm/v01

欧洲桤木（Alnus glutinosa）分布图谱

本数据集的分布图谱通过整合多源异构数据制作完成，数据来源涵盖可提供完整物种分布图谱的国家级至区域级地图集专著、物种出现点地理数据库以及科学文献。

本图谱以ZIP压缩包归档的ESRI形状文件（*.shp、*.shx、*.dbf、*.prj）格式生成。物种分布范围通过两类要素进行制图：其一为多边形要素（文件名后缀为"plg"），用于划定物种持续占据的连续分布区域；其二为点要素（文件名后缀为"pnt"），用于标识更为破碎且孤立的种群。若有报道显示存在因人为伴生而出现在物种自然分布范围之外的记录，则将附带额外的点/多边形形状文件（后缀为"syn"）。

所有划定分布范围的多边形边界已针对大陆与海洋边界进行了概化处理，并未裁剪至特定海岸线。此举可为使用者提供灵活操作空间：既可以掩膜剔除海洋区域，也可根据自身需求调用GIS数据图层裁剪并提取陆地分布范围部分。

请按以下格式引用：
Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. 欧洲主要木本物种分布区图谱. 《数据简报》（Data in Brief）12, 662-666. DOI: doi.org/10.1016/j.dib.2017.05.007

更多相关信息及参考文献详见"补充材料"文档：https://doi.org/10.6084/m9.figshare.5091901

本分布区图谱（Chorological maps）隶属于"欧洲林木树种地图集"（European Atlas of Forest Tree Species）项目，项目链接：https://w3id.org/mtv/FISE-Comm/v01