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Vegetation Mapping and Floristic Inventory

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Vegetation Mapping and Floristic Inventory VEGETATION TYPE MAP, COMMUNITY DESCRIPTIONS & FLORISTIC INVENTORY North Star Nature Preserve June 2019 Pitkin County, Colorado Prepared for: Pitkin County Open Space and Trails 530 East Main Street, Suite 201 Aspen, CO 81611 Prepared by: Peak Ecological Services, LLC 301 Boulder Canyon Drive, PO Box 827 Nederland, Colorado 80466 VEGETATION TYPE MAP, COMMUNITY DESCRIPTIONS & FLORISTIC INVENTORY North Star Nature Preserve Pitkin County, Colorado revision date: June 12, 2019 Summary This report maps and qualitatively describes the vegetation types on the North Star Nature Preserve in order to provide baseline information for management. Each vegetation type is also classified to U.S. National Vegetation Classification (USNC) standards. Finally, an updated vascular plant species list for the property is provided and the floristic quality index is calculated. TABLE OF CONTENTS 1.0 INTRODUCTION ............................................................................................................................................ 1 2.0 METHODS .................................................................................................................................................... 1 3.0 RESULTS ....................................................................................................................................................... 1 3.1. Vegetation Classification & Mapping ....................................................................................................... 1 3.1.1 Aspen Forest ....................................................................................................................................... 2 3.1.2 Douglas Fir Forest ............................................................................................................................... 3 3.1.3 Narrowleaf Cottonwood Riparian Forest ............................................................................................ 3 3.1.4 Blue-Spruce Forest .............................................................................................................................. 5 3.1.5 Gambel Oak Shrubland ....................................................................................................................... 5 3.1.6 Mountain Big Sagebrush – Sticky Rabbitbrush Shrubland .................................................................. 6 3.1.7 Mountain Willow Wet Shrubland ....................................................................................................... 6 3.1.8 Shrubby Cinquefoil Wet Shrubland ..................................................................................................... 7 3.1.9 Smooth Brome Ruderal Grassland ...................................................................................................... 7 3.1.10 Beaked Sedge Wet Meadow ............................................................................................................. 8 3.1.11 Reed Canarygrass Ruderal Marsh ..................................................................................................... 8 3.1.12 Wet Meadow (Meadows Foxtail Ruderal Marsh and Clustered Field Sedge Wet Meadow) ............ 9 3.2 Floristics.................................................................................................................................................. 11 3.2.1 Floristic Inventory ............................................................................................................................. 11 3.2.2 Floristic Quality Assessment ............................................................................................................. 11 4.0 REFERENCES .............................................................................................................................................. 12 5.0 FIGURES ..................................................................................................................................................... 13 APPENDIX A. PLANT SPECIES LIST ..................................................................................................................... 15 LIST OF TABLES Table 1. Vegetation Types. North Star Nature Preserve. ................................................................................. 10 Table 2. Floristic Quality Assessment Results. North Star Nature Preserve. .................................................... 11 LIST OF FIGURES Figure 1. Vegetation Type Map ....................................................................................................................... 14 June 2019 – Vegetation Community Descriptions and Floristic Inventory – North Star Nature Preserve Page i LIST OF PHOTOS Photo 1. Young Aspen Forest along trail (Aug-08-2018). .................................................................................. 2 Photo 2. Douglas Fir Forest (Aug-08-2018). ...................................................................................................... 3 Photo 3. Narrowleaf cottonwoods along Roaring Fork River (Sep-25-2017). .................................................... 3 Photo 4. Sinuous channel of the Roaring Fork River through North Star circa 1900. ........................................ 4 Photo 5. Narrowleaf Cottonwood - Willow Riparian Habitat along intermittent stream (Sep-25-2017)........... 4 Photo 6. Planted Blue Spruce (Sep-22-2018). ................................................................................................... 5 Photo 7. Sagebrush and Sticky Rabbitbrush Shrubland (Aug-8-2018). .............................................................. 6 Photo 8. Mountain Willow Wet Shrubland (Sep-25-2017). ............................................................................... 6 Photo 9. Non-Native Smooth Brome Grassland (Aug-08-2018). ....................................................................... 7 Photo 10. Beaked Sedge Wetland Association (Jul-12-2017). ........................................................................... 8 Photo 11. Reed Canarygrass (Jul-28-2017). ....................................................................................................... 8 Photo 12. Patches of Wet Meadow intermixed in the drier upland non-native Smooth Brome Grassland. ..... 9 June 2019 – Vegetation Community Descriptions and Floristic Inventory – North Star Nature Preserve Page ii 1.0 INTRODUCTION The North Star Nature Preserve (175-acres) and the adjacent James H. Smith Open Space (70+ acres) are unique and valuable tracts of open space on the edge of Aspen – an ecological sanctuary that encompasses significant wetland and riparian ecological communities and wildlife habitat (PCOST 2015). These properties, collectively called the North Star Nature Preserve (North Star), encompass a flat bottomland bisected by the Roaring Fork River and bounded by steep mountainsides. North Star supports both xeric and mesic plant communities influenced by abiotic factors such as moisture, elevation, aspect, and geology, but also by past land management which has included grazing, farming, and irrigation. Some of the original riparian and wetland habitat on North Star was drained and willows were eliminated in order to grow agricultural grasses in the 1950’s. However, there are still areas of high-quality wetlands on North Star, including an herbaceous fen located at the northwest corner and a willow shrub wetland beaver pond complex along the southern boundary of North Star. Other vegetation types present include narrowleaf cottonwood (Populus angustifolia) riparian forest, aspen (Populus tremuloides) forests, blue spruce (Picea pungens) stands, mountain big sagebrush (Artemisia tridentata ssp. vaseyana) shrublands, and an open meadow dominated by a mosaic of agricultural upland and mesic grasslands. On the steep hillsides on the west side of the Reserve are Douglas fir (Pseudotsuga menziesii) forests and Gambel oak (Quercus gambelii) shrublands. The purpose of this study was to map and qualitatively describe the vegetation types on North Star to provide baseline information for the management of the vegetation resources. In addition, an updated vascular plant inventory was conducted. 2.0 METHODS Prior to field reconnaissance, a preliminary vegetation type map was generated based on high quality aerial imagery, existing 2-foot and 1-foot contours, existing studies, and past field reconnaissance. Field verification of the preliminary mapping was completed by Rea Orthner and Denise Wilson on August 8, September 21- 22, and October 24, 2018. During the pedestrian surveys, representative data points were taken, the names of the dominant taxa and their abundance ranking by vegetation stratum was recorded, and presence of noxious weeds was noted. Each data point was also accompanied by representative photograph(s). Based on field reconnaissance, the preliminary vegetation map was revised to incorporate the results. All vegetation mapped was also classified to the U.S. National Vegetation Classification (USNVC) standards (USNVC 2017). 3.0 RESULTS 3.1. VEGETATION CLASSIFICATION & MAPPING The U.S. National Vegetation Classification (USNVC) is a central organizing framework for documentation, inventory, monitoring, and study of vegetation in the United States from broad scale formations like forests to fine-scale plant communities. The vegetation communities at North Star were classified to the two most detailed or “lowest” levels of the classification hierarchy, alliances and associations. Alliances are classified
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