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Mapping PVTs: Analyzing JUOC Encroachment in WY Sagebrush Ecosystems

This project explores various methods to define Potential Vegetation Types (PVTs) in Wyoming sagebrush ecosystems, particularly focusing on juniper encroachment (JUOC). Several options are presented: intersecting historical vegetation maps to assess JUOC extent, employing RFNN models for classification, utilizing climate data, and HUC-based partitioning. By analyzing the impact of JUOC on sagebrush, we aim to provide a refined understanding of vegetation dynamics and inform conservation strategies based on historical and current vegetation patterns.

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Mapping PVTs: Analyzing JUOC Encroachment in WY Sagebrush Ecosystems

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  1. PVT map with 2 versions of WY Sage model WY Sage with juniper WY Sage – no juniper

  2. Defining PVTs with JUOC encroachment: Option 1 Intersecting HVeg w/ modeled JUOC JUOC extent from RFNN model and Potential Veg Zone map JUOC extent from RFNN model (on top of final map)

  3. JUOC potential Former area of modeled JUOC -> now mapped as “WY Sage with Juniper encroachment” “Extract By Mask” Historic Veg-WY Sage Can do something similar with a version of RFNN instead of HVeg map: -model once with JUOC and once without -extract JUOC in “withJUOC” model from areas of sage in “noJUOC” model -reclassify these areas as “sage-with juniper encroachment” (Current Veg from circa 1920)

  4. Defining PVTs with JUOC encroachment: Option 2 Using RFNN probability surface -model once without JUOC -a second, two-class model (JUOC and everything else lumped) -use prob surface from 2nd model to reclassify 1st model: -everything with prob 10-50% -> “sage w/ JUOC encroachment” -everything with prob >50%-> “JUOC woodland”

  5. Defining PVTs with JUOC encroachment: Option 3 Using climate data to partition sage into 2 types Isolines in brown are 10”+ precip From suggestion by Rick Miller: Everything >=10” annprecip is open to JUOC encroachment Could also add a “distance from source” buffer e.g. if >=10” but >20km from JUOC potential then “sage – no juniper” WY Sage w/ JUOC but <10” precip WY Sage- no JUOC but >10” precip

  6. Defining PVTs with JUOC encroachment: Option 4 Using HUCs to partition sage into 2 types HUCs in red will reclassify sage types to “sage w/ JUOC”

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