Case Study Name (Landowner)

Nanuuq Legend Paper Birch Shelterwood (Douglas Cty, WI)

Stand Information
State or Province: 
Wisconsin
Nearest city or town: 
Foxboro, WI
Landowner: 
Douglas County, WI
Cover-type: 
Plant community or habitat classification and growth stage: 
ACL (Acer saccharum/Clintonia borealis) - See "A guide to forest communities and habitat types of northern Wisconsin, 2nd Ed." by John Kotar for detail.
Forest Health Threats: 
Estimated year of stand origin: 
2003
Additional information about stand origin: 
Spring 2003 harvest
Site Index: 
61
feet
for species: 
paper birch
Silviculture System: 
Brief silvicultural objective: 
Shelterwood harvest to regenerate the stand to paper birch.
Soils: 
Predominantly moderately well-drained sandy loams with sloping topography. Web Soil Survey indicates Keweenaw, stony-Newood, stony-Cathro complex, 0 to 15 percent slopes.
Stand area: 
49 acres
Treatment area: 
49 acres
Overview

Shelterwood system applied to regenerate an even-aged stand of paper birch. The objective of this sale was to selectively harvest a mature white birch dominated stand totaling 49 acres. This harvest will fit the standards of an even aged shelterwood harvest to yield a new age class. 

Silviculture Objective(s)

To conduct an experimental shelterwood harvest designed to regenerate paper birch.

Pre-treatment stand description and condition
Stand establishment and management history: 

Little is known about the past management practices applied to this site, but it can be assumed to be similar to prevalent harvesting methods of the early-to-mid 1900s. Mostly consisting of high-grading the white pine early on and later the aspen from these mixed stands. 

Pre-treatment forest health issues: 

No specific evidence of diseases or insect problems were detected within the sale. 

Landowner objectives/situation: 

A check of the Natural Heritage Inventory revealed no known occurrences of rare species or communities and the Land Type Association of the area is Patison Moraines.

Silviculture Prescription

This stand was leave-tree marked with an overall goal of leaving 35% crown closure in the residual stand. The silvicultural prescription for this treatment utilized site preparation in the form of soil scarification (pole-length skidding during a summer harvest) to stimulate natural white birch regeneration through seed. Those trees exhibiting the best figure, form, and crowns were marked and should be retained as seed trees. This unit will require harvesting equipment and site preparation to improve the seedbed by scarification in order to promote natural birch regeneration via seed germination. The prescription called for leaving the stand for four years after the shelterwood prep cut allowing the seed bank to germinate and establish seedlings, followed by a complete overstory removal through a winter harvest to protect the seedlings, promoting vigor.

The sale boundary was designed to ensure the best possible opportunity for harvesting during non-frozen, summer conditions. 

What actually happened during the treatment
The quadratic mean stand diameter of 10.17 inches was calculated for the residual (marked) trees with 31 ft.² of residual basal area. This equates to 35% crown closure at 55 trees per acre, which exactly match the original goal of 35%.
Post-treatment assessment

The site has exhibited great regeneration success. An August 2009 regeneration check involving measurement of 68 plots across the 49-acre harvest area shoed very good stocking of paper birch, with 54% of new seedlings of paper birch indicated as free to grow. Other species regenerated within the treatment area include red oak, aspen, red maple, and other northern hardwoods. Forty one percent of birch regeneration was in the form of seedlings, with 28% seedling sprouts and 31% stump sprouts. See table in Photographs section for regeneration detail. 

Summary / lessons learned / additional thoughts

This experimental treatment seems to have been a success. A similar treatment was implemented just north of this one (Boone & Crockett birch sale) a year later and has also led to successful paper birch regeneration.

Photographs
Sale outline on Google EarthSummer 2011 airphoto from Web Soil SurveyRegeneration data from a 2009 plot survey
Keywords
Biography
Name: 
David Cizmas, via Jason Langenecker
Organization: 
Douglas County Forestry Department
Address: 
Solon Springs , WI
Phone Number: 
(715) 378-2219