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FIADB 4.0 Update: Carbon, Biomass, and Trend Analysis

This update introduces carbon and biomass estimates at various levels in the FIADB database, allowing for trend analysis and reporting on growth, removals, and mortality. It also includes new biomass and carbon components and improved consistency and accuracy.

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FIADB 4.0 Update: Carbon, Biomass, and Trend Analysis

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  1. What’s new with FIADB 4.0:Carbon, biomass, and trend analysisMark H. HansenNRS – St. Paul, MN

  2. FIA biomass estimates • Tree level estimates of the biomass of all live (and some formerly live) trees 1” diameter and larger on forest land. • Used to report total biomass at various levels. • Indirectly used to compute total carbon at various levels. • Not currently used to compute the growth, removals and mortality of biomass or carbon .

  3. Volume components in both FIADB3 & FIADB4 Trees < 5” have zero volume Rotten or missing cull Form cull or sound defect Gross volume (VOLCFGRS) >= Sound volume (VOLCFSND) >= Net volume (VOLCFNET)

  4. Biomass components in FIADB3 Trees < 5” have zero DRYBIOM Rotten or missing cull Form cull or sound defect Total gross biomass (DRYBIOT) minus Merch. Biomass (DRYBIOM ) =Tops, limbs and stump

  5. Biomass components in FIADB4 Rotten or missing cull Form cull or sound defect --------------------------Trees 5”+ DBH --------------------------- Saplings Woodland species DRYBIO_BOLE DRYBIO_TOP DRYBIO_STUMP DRYBIO_SAPLING DRYBIO_WDLD_SPP All trees 1” diameter and larger DRYBIO_BG REGIONAL_DRYBIOM and REGIONAL_DRYBIOT are in a new tree level table by themselves.

  6. Tree biomass components in FIADB4 1” 2” 3” 4” 5” 6” 7” 8” ….

  7. Carbon components in FIADB4 Forest carbon on tree records (carbon/tree) CARBON_AG CARBON_BG Forest carbon on condition records (carbon/acre) CARBON_DOWN_DEAD CARBON_LITTER CARBON_SOIL_ORG CARBON_STANDING_DEAD CARBON_UNDERSTORY_AG CARBON_UNDERSTORY_BG

  8. Other Biomass components in FIADB4 The REF_SPECIES table contains all the coefficient values (stored at the species level) that are needed to compute biomass using the Component Ration Method (CRM) (as used to compute DRYBIO_BOLE … ) and also the coefficients need to compute biomass based on Jenkins. REGIONAL_DRYBIOT AND REGIONAL_DRYBIOM

  9. Example change matrix analysis MN 1999-2002 plots remeasured in 2004-2007 Forest land both measurements

  10. Previous measurement Current measurement Cond 1 Aspen Cond 1 CC

  11. Previous measurement Current measurement Cond 1 Aspen Cond 1 CC

  12. Cond 1 Aspen Cond 1 BFCC Cond 2 Balsam fir Previous measurement Current measurement

  13. Cond 1 Aspen Cond 1 BFCC Cond 2 Balsam fir Previous measurement Current measurement

  14. Previous measurement Current measurement Cond 2 Nonforest Cond 1 Aspen Cond 1 BFCC Cond 2 Balsam fir

  15. Previous measurement Current measurement Cond 2 Nonforest Cond 1 Aspen Cond 1 BFCC Cond 2 Balsam fir

  16. 85,000 remeasured forest subplots in NRS, 1999-2007 • 91.3% one condition both measurements. • 3.4% two conditions both measurement, no change in the mapping. • 3.7% mapping eliminated or added. • 1.3% three conditions on the subplot. • 0.3% mapping was moved but not eliminated.

  17. Lake States, Plains States and Central States 2007+ Maine and Pennsylvania 2006 Increase in forest land from 116.9 to 120.9 million acres (3.4%) over 5 years

  18. The change matrix will enable easy construction of: • Growth, removals and mortality reporting by either initial or final conditions. • Empirical yield tables (volume per acre by age class) linked to observed growth over past remeasurement period. • Good input for growth and yield research. • Allocation of component of growth to land use changes.

  19. Other changes • Added two new POP tables • POP_EVAL_TYP • POP_EVAL_TYP_DESCR • Renamed POP_ATTRIBUTE to REF_POP_ATTRIBUTE • Added and removed some reference tables and added documentation for the reference tables that will be available with FIADB 4.0 • Changed the name of a few attributes that had the same name on two different tables but different definitions. Example: changed STATUSCD on SUBPLOT to SUBP_STATUS_CD • Dropped some attributes, many of which were noted in Version 3.0 as “to be dropped

  20. Added attributes to various tables • PLOT.INTENSITY • POP_ESTN_UNIT.P1SOURCE • POP_EVAL.START_INVYR • POP_EVAL.END_INVYR • POP_EVAL_ATTRIBUTE.STATECD • POP_EVAL_GRP.NOTES • SITETREE.CONDLIST (actually a rename) • SUBPLOT.SUBP_STATUS_CD (actually a rename) • SURVEY.ANN_INVENTORY • SURVEY.RSCD

  21. Questions ??????Comments Thank you

  22. Relationships among phase 1 tables and the phase 2 plot data tables in FIADB.

  23. Volume estimates have been one of our primary products for many years.

  24. Regional biomass computation • DRYBIOT = fb1(DIA,…) • DRYBIOM = fb2(DRYBIOT,…) or • DRYBIOM = fb3(VOLCFGRS,…) • DRYBIOT = fb4(DRYBIOM,…) • Biomass and volume equations take different forms and were developed at different times from different data sets.

  25. Issues • National consistency. • Biomass-volume consistency. • Errors in application of biomass equations. • Realistic estimates of components.

  26. Consistent - reasonable estimatesSelect red oak, 10.0” dia, live, growing stock trees, 60-70’ HT

  27. Jenkins et al. – total above ground biomass (including foliage)

  28. Biomass data sets • All the boles are strong • All the trees are good looking • All the SI are above average

  29. Component Ratio Method (CRM) • Based on the assumption that FIA volume estimates are pretty good. • Sound wood has biomass. • Rotten and missing wood has no biomass. • If we get the bole right, we are about 75% done.

  30. Biomass in the boleDRYBIOM in FIADB v3 DRYBIO_BOLE in FIADB v4 VOLCFSND (cf) x wood density (lbs/cf) + VOLCFSND (cf) x bark ratio (cf bark/cf wood) x bark density (lbs/cf)

  31. Biomass in the bole DRYBIO_BOLE DRYBIO_BOLE = VOLCFSND * WOOD_SPG * 62.4 + VOLCFSND * BARK_PCT * BARK_SPG * 62.4 = VOLCFSND * (WOOD_SPG + BARK_PCT * BARK_SPG) * 62.4

  32. Bole Bole biomass = (volume of sound wood in the bole) x (density of sound wood) + (volume of bark on the bole) x (density of bark)

  33. Biomass in the stumppart of (DRYBIOT-DRYBIOM) in FIADB v3 DRYBIO_STUMP in FIADB v4 DRYBIO_BOLE (lbs) x Jenkins biomass in stump (lbs) / Jenkins biomass in bole (lbs)

  34. DRYBIO_STUMP DRYBIO_STUMP = VOLCFSND * (WOOD_SPG + BARK_PCT * BARK_SPG) * 62.4 * ( raile_stump_b1*dia*dia / (((exp(jenkins_stem_bark_ratio_b1 + jenkins_stem_bark_ratio_b2 /(dia*2.54)) + (exp(jenkins_stem_wood_ratio_b1 + jenkins_stem_wood_ratio_b2 /(dia*2.54)))) * (exp(Jenkins_TOTAL_b1 + jenkins_TOTAL_b2 * ln(dia*2.54))))) )

  35. Stump Stump biomass = Bole biomass x Stump ratio

  36. Biomass in the tops and limbspart of (DRYBIOT-DRYBIOM) in FIADB v3 DRYBIO_TOP in FIADB v4 DRYBIO_BOLE (lbs) x Jenkins biomass in branches (lbs) / Jenkins biomass in bole (lbs)

  37. Tops and limbs Top and limb biomass = Bole biomass x Branch ratio

  38. Saplings (trees < 5.0” diameter) • CRM is Jenkins adjusted to meet national average CRM biomass of a 5.0” diameter tree by species group. • Smooth transition over the 5” threshold is important for growth estimation. • DRYBIOT in FIADB v3 • DRYBIO_SAPLING in FIADB v4

  39. Below ground – coarse roots (all trees) • Not in FIADB v3 • DRYBIO_BG in FIADB v4 • Computed directly using Jenkins (no adjustments)

  40. What follows are Regional vs CRM vs Jenkins estimates for each FIA region by state • All estimates are based on the latest/greatest public version of FIADB (as of Oct 2008). • All estimate are total above ground biomass of live trees 5” diameter and larger on forest land. • Annual estimates for 47 states, mostly 2007 and 2006, a few 2005. • New Mexico – 1999 periodic inventory is include. • Oklahoma and Hawaii are missing.

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