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P rotecting the Forests of the Chesapeake Watershed: Use Best Tools …

P rotecting the Forests of the Chesapeake Watershed: Use Best Tools …. John Scrivani Resource Information April 16, 2007 Update. Methodology Update. Bring forward the five layers developed for Version 1.0 Streams, shorelines, and floodplain forests and forested wetlands

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P rotecting the Forests of the Chesapeake Watershed: Use Best Tools …

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  1. Protecting the Forests of the Chesapeake Watershed:Use Best Tools … John Scrivani Resource Information April 16, 2007 Update

  2. Methodology Update • Bring forward the five layers developed for Version 1.0 • Streams, shorelines, and floodplain forests and forested wetlands • Forests in headwaters and on steep slopes • Forest protecting drinking water supplies • Large contiguous blocks of forest; and • Sustainable, managed working forests • Add layers representing habitat integrity at the landscape scale (12-digit hydrologic units) • Index of Terrestrial Habitat Integrity • Modified Index of Biotic Integrity (Aquatic systems from INSTAR) • Compute forest conservation value via weighted overlay with 60% weight on habitat integrity

  3. Methodology Update • For comparison, compute forest conservation value for current conserved lands • Compute layer of forest conversion rates from Phase 1 FIA data • Compute weighted overlay of forest conservation value and forest conversion rates to identify higher value lands under higher threat of conversion

  4. Streams, shorelines, floodplain forests and forested wetlands • National Hydrography Dataset (NHD) 1:100K • Buffered to 500m • Refined by NWI, NLCD

  5. Headwaters and steep slopes • National Watershed Boundary Dataset (NWBD) 1:24K (DCR) • Divides buffered to 1km • Ranked by % slope

  6. Forests protecting drinking water supplies • Surface water source protection areas (VDH) • Zones 1 & 2

  7. Large contiguous blocks of forest • VANLA (DCR)

  8. Managed working forests

  9. Index of Terrestrial Habitat Integrity Composite of four layers: • The Natural Cover Index (INC) is based on the proportion of a watershed that is represented by natural vegetation • The River-Stream Corridor Integrity Index(IRSCI) is the proportion of the river-stream corridor that is covered by natural vegetation • The Habitat Fragmentation/Road Index (IHF) addresses habitat fragmentation by roads and reflects degradation of water quality, and terrestrial and aquatic ecosystems from associated development • The Imperviousness Index (IP) is the proportion of a watershed that is identified as impervious cover

  10. Figure 1. Natural Cover Index(INC)

  11. Figure 2. River-Stream Corridor Integrity Index (IRSCI)

  12. Figure 3. Habitat Fragmentation/Road Index (IHF)

  13. Figure 4. Imperviousness Index (IP)

  14. Figure 5. Index of Terrestrial Habitat Integrity (ITHI )

  15. Figure 6. Modified Index of Biotic Integrity (mIBI )

  16. Overlay Model - Forest Conservation Value • After an initial equal-weighting overlay it was deciding to set the relative weights: • 30% Modified Index of Biotic Integrity (mIBI) • 30% Index of Terrestrial Habitat Integrity (ITHI ) • 20% large forest blocks • 5% Streams, shorelines, floodplains and forest wetlands • 5% headwaters and steep slopes • 5% drinking water source protection areas • 5% managed working forests • The resulting values ranged from 1 to 10.

  17. Figure 7. Forest Conservation Value

  18. Figure 8. Forest Conservation Value of Non-conserved Lands

  19. Cumulative Acres of Forest by Decreasing Conservation Value Score

  20. Figure 9. Forest Conservation Value with Threat of Forest Conversion

  21. Acreage Distribution of Forest Conservation Value Scores weighted with Conversion Threat.

  22. Thank you !

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