1 / 49

Single year drought impacts on trees and forests

Single year drought impacts on trees and forests. Steve D’Eon, R.P.F. Program Forester. Drought: From a tree perspective? Impact on trees. Impact on forests. What you should know about it. Drought: 1 st How bad was it? Rain Gauge Data Forest fires. 2012 -------. 2011 -------.

talmai
Download Presentation

Single year drought impacts on trees and forests

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. Single year drought impacts on trees and forests Steve D’Eon, R.P.F. Program Forester

  2. Drought: From a tree perspective?Impact on trees.Impact on forests.What you should know about it.

  3. Drought: 1st How bad was it?Rain Gauge DataForest fires

  4. 2012 ------- 2011 ------- Month < 50 mm Month < 25 mm Source: http://www.agricorp.com/en-ca/Programs/ProductionInsurance/ForageRainfall/Pages/RainfallData.aspx

  5. Why I don’t like monthly rain gauge data. Daily data from Cormac Data courtesy Frank Ahern, Cormac, Ontario

  6. 30 days prior to July 16th Red = 60 mm less than normal precip. Source: http://www4.agr.gc.ca/DW-GS/historical-historiques.jspx?lang=eng&jsEnabled=true

  7. 30 days prior to July 23rd

  8. 1939 1960’s 2012 Env. Canada, Ottawa airport data

  9. Photo courtesy OMNR fire

  10. Drought: 2012: 46 fires (2011 one fire)

  11. Photo courtesy OMNR fire

  12. Drought: From the perspective of a tree?

  13. Spring Freshette = soil moisture source www.wateroffice.ec.gc.ca Normal year 2012 2012: spring melt was early and not replaced by rain.

  14. Figure courtesy Glen McLeod, Trees Ontario Season when drought strikes is important

  15. Worst time to have a drought: Shoot and leaf/needle elongation

  16. Newly planted seedlings Drought when they were elongating shoots….

  17. For a tree, Stress is Cumulative 2012 acorn crop 2010 spring frost Recent harvest

  18. When drought pushes trees beyond their Tipping Point: Aug. 20th looking sick but not dead.

  19. August 20th, 2012

  20. Same place, November 7th, 2012

  21. 3. Drought Impacts on trees • Stress into the future • Growth loss, stem form • Crown dieback • Root dieback • Death (especially newly planted)

  22. Stress into the future Parts of a tree die.

  23. Stress into the future Trees try to recover by epicormic buds. Left is early Sept. Above is Aug. 20th. Photo: Linda Touzin OMNR

  24. Stress into the future Excessive flowering or what is called a stress cone or seed crop.

  25. Drought impact: Growth loss Diameter, Height 2013? 2012 2011

  26. Drought impact: Stem Form 2011 2010 2009

  27. Crown/Root Dieback Root dieback lies unseen but weakens the tree’s anchor, uptake.

  28. Crown/Root Dieback Early leaf fall, Dead and dying parts in the crown. August 28th

  29. Drought caused Mortality Germanicus Road, Eganville

  30. 4. Drought Impacts on forests • Forests are resilient. • Forests are more than just trees. • The resource is the site, trees are the crop.

  31. Drought Impacts on forests Stress continues into the future. (don’t add more stress!) Off-site species, thin soils, restricted rooting, sandy gravelly soils, poorly managed stands will all see greater impact from drought stress.

  32. Drought Impacts on forests Photo curtsey of OMNR Pembroke fire

  33. Drought Impacts on forests Taylor Scarr, OMNR

  34. South facing slopes Micksburg

  35. Zion Line, Cobden South facing slope Goshen Road, Renfrew

  36. Thin soiled knolls Behind Renfrew Toyota

  37. Thin soiled knolls Zion line

  38. Recently planted 2009 (age 3) 2012 (age 6) Lake Clear Road

  39. Recently planted

  40. Recently planted Kutschke Road

  41. Random patches Goshen Road, Renfrew

  42. 5. What you should know • Monitor, don’t jump to conclusions. • Seek qualified advice for things you don’t know. • Best advice is to keep forests healthy and properly managed. • Take a long-term perspective.

  43. What you should know Dead Alive Near Barry’s Bay Confirm dead, Refill plant, Supplement nature. Watering maple, Zion Line, Cobden

  44. Sanitize or let nature heal? Wood from browned out trees is marginally marketable up until dries out this spring. Hennen Road, Pembroke

  45. Monitor, advice Ips pini CFB Petawawa Monitor for secondary pests, Sanitize, Let nature heal. White spotted pine sawyer beetle

  46. What you should know: • Don’t add more stress!!! • Green (live branches) pruning, • any activity that: compacts the soil, removes organic matter, removes nutrition, allows wind to blow through and dry out your stand…..

  47. What Should You Know? • Don’t add more stress!!!

  48. Drought: From the perspective of a tree.Impact on trees.Impact on forests.What you should know.

  49. Thank You Steve D’Eon, R.P.F. 613 732-5595 sdeon@sympatico.ca steve.deon@ontario.ca

More Related