1 / 13

Forest Mensuration II

Forest Mensuration II. Lectures 11 Stocking and Stand Density Avery and Burkhart, Chapter 15. Definitions. Stand Density –is a quantitatively term describing the degree of stem crowding within a stocked area Absolute or relative

reegan
Download Presentation

Forest Mensuration II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Forest Mensuration II Lectures 11 Stocking and Stand Density Avery and Burkhart, Chapter 15

  2. Definitions • Stand Density –is a quantitatively term describing the degree of stem crowding within a stocked area • Absolute or relative • Stocking –refers to the adequacy of a given stand density to meet some management objective • Understocked, fully stocked, or overstocked • Stand density and stocking are often applied interchangeably A stand that is “overstocked” for one management objective could be “understocked” for another

  3. Measures of Stand Density • Stand density – measures how thickly trees grow in a stand • Stems per unit area • Basal area • Volume • Indices

  4. Subject stand Measures of Stand Density • Stems per unit area • Basal area • Relative stand density • Crown competition factor Fully stocked

  5. Fully stocked Subject stand Measures of Stand Density (cont.) • Stems per unit area • Basal area • Relative stand density • Crown competition factor

  6. RSD=1 =0.55 =0.15 Zone of Imminent Competition Mortality Density of the subject stand RSD = Maximum density attainable with the same as the subject stand Zone of crown closure 3/2 law of self thinning Ontario’s Jack Pine DMD (Archibald & Bowling. 1995. OMNR NEST TN-005) Measures of Stand Density (cont.) • Stems per unit area • Basal area • Relative stand density • Crown competition factor

  7. Measures of Stand Density (cont.) • Stems per unit area • Basal area • Relative stand density • Crown competition factor – reflects the area available to the average tree in a stand in relation to the maximum area it could use if it were open-grown

  8. Measures of Point Density • Quantify the competition level at a given point or a tree in a stand Area overlap index

  9. Measures of Point Density • Distance-weighted size ratios

  10. Stocking • A ratio of comparison of the density of a subject stand to that of a “ideal” or reference stand • Volume • Basal area

  11. Measures of Stocking • What should constitute full stocking of a particular species on a given site? • Normal or fully stocked stand: in such a hypothetical stand, tree crowns are fitted together so that no sunlight is wasted and each crown is matched with a root system that fully utilizes the soil • Normal stands are “average best” -- closed canopy stands

  12. Stocking (cont.) • Measures • Mature stands • Stands at regeneration stage

  13. 30 25 20 15 10 A B Stocking Guides • Depicts the relationship between basal area, trees per ha, and quadratic diameter at breast-height Mean DBH (cm) Basal area per ha Trees per ha

More Related