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NASP IMDS

NASP IMDS. Tree and Stand Growth/Productivity. Quantifying Site Productivity. Two way to quantify site productivity Direct Measures When what you want on the site is present and differences in genetics are not expected Indirect Measures Find something about a stand that is:

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NASP IMDS

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  1. NASP IMDS Tree and Stand Growth/Productivity

  2. Quantifying Site Productivity • Two way to quantify site productivity • Direct Measures • When what you want on the site is present and differences in genetics are not expected • Indirect Measures • Find something about a stand that is: • Easy to measure • Related to potential productivity • Relatively unaffected by management (often density)

  3. Height growth pattern Max Ht. 0 TIME

  4. Construction • Inventory data (massive set) • Continuous Forest Inventory • Stem analyses • Anamorphic • Polymorphic

  5. Indirect Measures:Environment • AKA: Soil-Site Index (soil prediction of site index) • Based on measurable soil and site variables • Total depth of soil • Thickness of A horizon, B horizon, or both • Organic matter in A horizon • Slope position • Precipitation patterns 140 100 From: Carmen 1956

  6. Indirect Measures: Vegetation • Habitat Classification Based on potential (non-disturbed, near-climax) vegetation • They aid in delimiting boundaries (typically associated with topographic features [microclimates] or soils boundaries) From: Tecle and Covington 1991

  7. Bottom Line on Site Index • Choose trees carefully, when you have them! • Stay close to the base age • Check the axes labels and your assumptions • Do “enough” trees for a decent estimate

  8. Site Productivity Classes • Site Classes: I-V common • Local rules • Drives mortality functions, basal area accumulation, diameter, and volume potentials

  9. Crown growth • Primary or secondary? • Crown metrics • Live Crown Ratio • Crown Radius • Crown volume and bulk density • Leaf Area Index

  10. Secondary Growth • Adding xylem annually • Diameter and radial growth • Basal Area ‘currency’ • 005454*D2 • 0000785*D2 (metric) • Volume measures • Stem taper • Wood Quality • PAI and MAI Volume Volume/ Time Mean volume/ time time

  11. Stand Density and PAI

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