Vegetation - Carrizo Plain National Monument, Ecological Reserve and Adjacent Elk Range [ds1094]

The California Department of Fish and Wildlife (CDFW) Vegetation Classification and Mapping Program (VegCAMP) has created a fine-scale vegetation map of part of the range of the American Ranch and Chimineas Ranch tule elk herds. This section of the elk range is adjacent to the Carrizo Plain National Monument and the Chimineas Ranch Unit of the Carrizo Plain Ecological Reserve, both of which have been previously mapped. This map has been seamed to the vegetation map of the Chimineas Ranch completed by VegCAMP (VegCAMP 2010) and the map of the Carrizo Plain National Monument produced by the California Native Plant Society (Stout et al. 2013), and completes the range of these two elk herds in San Luis Obispo County, California. Like those maps, this mapping follows Survey of California Vegetation, Federal Geographic Data Committee (FGDC), and National Vegetation Classification (NVC) standards (FGDC 2008, Jennings et al. 2009). The map legend is based on the classification in Stout et al. (2013), with slight modifications as discussed in Appendix C of the report, which is available here: https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=92951. Reconnaissance-level sampling of vegetation stands in the project area was conducted in the spring of 2013. Polygons were drawn using heads-up digitizing with true color 1-foot aerial imagery from August 1, 2007 as the map base. Supplemental imagery included National Agricultural Imagery Program (NAIP) true color and color infrared (CIR) 1-meter resolution data from 2010–2012, Bing imagery, and current and historical imagery from Google Earth. The minimum mapping unit (MMU) is 1 acre, with the exception of wetland types, which have an MMU of ½ acre. Mapping is to the NVC hierarchy Association, Alliance, or Group level based on the ability of the photointerpreters to distinguish types based on all imagery available and on the field data. Two sub-Group level mapping units were used in instances where the vegetation types could not differentiated on the imagery. The first mapping unit is composed of the Salvia leucophylla, Eriogonum fasciculatum, Artemisia californica, and Artemisia californica-Eriogonum fasciculatum Alliances; the second is composed of the Atriplex polycarpa and Atriplex canescens Alliances. Accuracy assessment (AA) data was collected in spring of 2014. Map accuracy was calculated to be 89 percent; corrections were made to the map based on the AA data to increase the final accuracy.加州鱼类和野生动物部（California Department of Fish and Wildlife, CDFW）植被分类与制图项目（Vegetation Classification and Mapping Program, VegCAMP）针对美国牧场与奇米内阿斯牧场的图莱麋鹿种群部分分布区域，制作了高精度植被制图。该麋鹿分布区域毗邻卡里佐平原国家纪念区（Carrizo Plain National Monument）以及卡里佐平原生态保护区奇米内阿斯牧场单元（Chimineas Ranch Unit of the Carrizo Plain Ecological Reserve），上述两处区域此前均已完成植被制图。本次制图已与VegCAMP于2010年完成的奇米内阿斯牧场植被图，以及加州本土植物协会（California Native Plant Society）发布的卡里佐平原国家纪念区植被图（Stout等，2013）进行拼接，完整覆盖了加利福尼亚州圣路易斯奥比斯波县内这两处麋鹿种群的分布范围。与前述制图一致，本次植被制图遵循《加州植被调查》、联邦地理数据委员会（Federal Geographic Data Committee, FGDC）以及国家植被分类系统（National Vegetation Classification, NVC）的相关标准（FGDC, 2008; Jennings等, 2009）。制图图例以Stout等（2013）的分类体系为基础，结合报告附录C的说明进行了小幅调整，报告全文可通过以下链接获取：https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=92951。项目区域内的植被群落样地于2013年春季开展了踏勘级采样。制图以2007年8月1日拍摄的1英尺分辨率真彩色航空影像为基底，通过屏幕数字化绘制图斑。补充影像数据包括2010-2012年获取的1米分辨率美国农业影像计划（National Agricultural Imagery Program, NAIP）真彩色与彩色红外（color infrared, CIR）影像、必应影像，以及谷歌地球的历史与实时影像。最小制图单元（minimum mapping unit, MMU）为1英亩，湿地类型除外，其最小制图单元为0.5英亩。制图精度根据影像解译人员可区分的植被类型及实地调查数据，达到国家植被分类系统的群丛（Association）、联盟（Alliance）或群系组（Group）等级别。当无法通过影像区分植被类型时，采用2个亚群系组制图单元：第一组包含Salvia leucophylla、Eriogonum fasciculatum、Artemisia californica以及Artemisia californica-Eriogonum fasciculatum联盟；第二组包含Atriplex polycarpa与Atriplex canescens联盟。精度评估数据于2014年春季采集，制图整体精度经计算达89%，并基于该评估数据对原图进行修正以提升最终制图精度。