9-second gridded continental Australia revegetation benefit (cleared natural areas) for Amphibians 1990:2050 MIROC5 RCP 8.5 (CMIP5) (GDM: AMP_r2_PTS1)

Benefits of revegetation index for Amphibians as a function of land clearing within the present long term (30 year average) climate (1990 centred) based on Generalised Dissimilarity Modelling (GDM) of compositional turnover. This metric represents the marginal benefit from a unit increase of vegetation at the site, which is a direct function of the slope of the species area curve at the test state of the site. In practice, revegetation of the whole cell is likely to be impractical due to the availability of cleared land within the cell, and practical limitations such as land ownership and revegetation cost. The metric therefore excludes these factors from the analysis, allowing direct comparison of the relative benefit of a given area of revegetation between cells. The values of the index generated according to the above formula are generally low (since a significant area is required to support additional species) and the index is rescaled by multiplying by 1000 to bring it into an approximate 0-1 range. This metric was developed along with others for use in an assessment of the efficacy of the protected area system for biodiversity under climate change at continental and global scales, presented at the IUCN World Parks Congress 2014. It is described in the AdaptNRM Guide “Helping Biodiversity Adapt: Supporting climate adaptation planning using a community-level modelling approach”, available online at: www.adaptnrm.org. Data are provided in two forms: 1. Zipped ESRI float grids: Binary float grids (*.flt) with associated ESRI header files (*.hdr) and projection files (*.prj). After extracting from the zip archive, these files can be imported into most GIS software packages, and can be used as other binary file formats by substituting the appropriate header file. 2. ArcGIS layer package (*.lpk): These packages contain can be unpacked by ArcGIS as a raster with associated legend. Additionally a short methods summary is provided in the file BiodiversityModellingMethodsSummary.pdf for further information. Layers in this 9s series use a consistent naming convention: BIOLOGICAL GROUP _ FROM BASE_ TO SCENARIO_ ANALYSIS e.g. A_90_CAN85_S or R_90_MIR85_L where BIOLOGICAL GROUP is A: amphibians, M: mammals, R: reptiles and V: vascular plants本数据集围绕以1990年为基准的长期（30年平均）气候背景下，土地开垦对两栖类植被恢复指数的边际效益展开，分析基于物种组成周转的广义非相似性模型（Generalised Dissimilarity Modelling, GDM）构建。该指标表征研究样地内植被每单位增量所带来的边际效益，其取值直接由样地测试状态下的物种-面积曲线斜率决定。实际应用中，受限于栅格单元内已开垦土地的可获取性，以及土地所有权、植被恢复成本等现实约束，对整个栅格单元实施全域植被恢复往往不具备可行性。因此本指标在分析中剔除了上述因素，以便直接比较不同栅格单元间特定面积植被恢复的相对效益。依据上述公式生成的指标原始数值通常较低（因为新增物种需要较大的面积支撑），因此将该指标乘以1000进行重缩放，使其数值范围大致落在0至1区间内。本指标与其他同类指标一同开发，用于在大陆及全球尺度上评估气候变化背景下保护区系统对生物多样性的保护效能，相关研究成果曾在2014年世界自然保护联盟（IUCN）世界公园大会上展示。该指标的详细说明载于AdaptNRM发布的《助力生物多样性适应：基于群落级建模方法支撑气候适应规划》指南，可通过在线链接www.adaptnrm.org获取。本数据集提供两种格式：1. 压缩的ESRI浮点栅格数据：包含二进制浮点栅格文件（*.flt）、配套的ESRI头文件（*.hdr）及投影文件（*.prj）。从压缩包中解压后，这些文件可导入绝大多数地理信息系统（GIS）软件中，也可通过替换对应头文件的方式，作为其他二进制文件格式使用。2. ArcGIS图层包（*.lpk）：该类包可通过ArcGIS软件解压为带有配套图例的栅格图层。此外，文件BiodiversityModellingMethodsSummary.pdf中提供了简短的方法学摘要，以供获取更多相关信息。本9s系列栅格图层采用统一命名规则：生物类群_基准时段_情景_分析类型，示例为A_90_CAN85_S或R_90_MIR85_L。其中生物类群对应关系为：A代表两栖类，M代表哺乳类，R代表爬行类，V代表维管植物。