stand quality management of southern hardwood forests · microsoft powerpoint - meadows sqm...
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![Page 1: Stand Quality Management of Southern Hardwood Forests · Microsoft PowerPoint - Meadows SQM slides.pptx [Read-Only] Author: kbrasher Created Date: 6/3/2013 10:14:34 AM](https://reader034.vdocuments.us/reader034/viewer/2022050408/5f84ec01322acb438b7c8313/html5/thumbnails/1.jpg)
Stand Quality Management ofSouthern Hardwood Forests
Steve MeadowsUSDA Forest Service
Center for Bottomland Hardwoods Research
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Stand Quality Management
If it’s a good tree, leave it!!
If it’s a poor tree, cut it!!
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Preferred Growing Stock
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Desirable Growing Stock
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Acceptable Growing Stock
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Cutting Stock
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Cull Stock
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Superior Poletimber Stock
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Inferior Poletimber Stock
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Thinning PrescriptionsStand Quality Management
Tree Class AccSupP AccNoPole DesSupP DesNoPole
Sawtimber
Preferred
Desirable
Acceptable
Cutting Stock
Cull Stock
Poletimber
Superior Pole
Inferior Pole
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Step 1Conduct Timber Cruise
• Collect data on sample trees – species, dbh class, crown class, and tree class
• Calculate stand-level variables – trees per acre, basal area per acre, quadratic mean diameter, stocking percent, and tree class distribution
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Step 1Conduct Timber Cruise
TREE CLASS TPA BA QMD
Preferred 8 17 20.0
Desirable 15 24 17.1
Acceptable 19 28 16.3
Superior Pole 12 7 10.1
Growing Stock 54 76 16.1
Cutting Stock 23 27 14.6
Cull Stock 7 10 15.5
Inferior Pole 36 13 8.1
Overburden 66 50 11.8
TOTAL 120 126 13.9
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Step 2Make Appropriate Management Decision
• Do we manage the stand or regenerate the stand? – based on initial stand density and initial stand quality
• Do we thin the stand now or do nothing and allow it to grow until thinning is necessary? – based on initial density
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Decision RuleManage or Regenerate?
MANAGE those stands in which:
• Stocking is at or above the C-15 lineAND
• The growing stock component accounts for at least 50 percent of total stand basal area
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Decision RuleThin Now or Do Nothing?
• Decision is based solely on initial stand density
• THIN stands in which stocking is near, at, or above 100 percent
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Step 3Select Appropriate Thinning Prescription
• Initial stand quality – tree class distribution
• Stage of stand development – length of time remaining in the rotation
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Conceptual ModelStand Quality Management
STAGE OF STAND DEVELOPMENT
Early/Mid Late
INITIALMedium AccSupP AccNoPole
QUALITYHigh DesSupP DesNoPole
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Tree Class Distribution
TREE CLASS BA BA % QMD
Preferred 17 13 20.0
Desirable 24 19 17.1
Acceptable 28 22 16.3
Superior Pole 7 6 10.1
Growing Stock 76 60 16.1
Cutting Stock 27 22 14.6
Cull Stock 10 8 15.5
Inferior Pole 13 10 8.1
Overburden 50 40 11.8
TOTAL 126 100 13.9
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Conceptual ModelStand Quality Management
STAGE OF STAND DEVELOPMENT
Early/Mid Late
INITIALMedium AccSupP AccNoPole
QUALITYHigh DesSupP DesNoPole
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Step 4Mark Stand for Thinning
• Remove ONLY those tree classes specified in the selected prescription
• No consideration for residual stand density• Timber marker should focus solely on
identifying trees in the tree classes specified for removal
• ALL trees in the specified tree classes should be removed
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Step 5Plan Subsequent Thinnings
• Decision Rule – conduct subsequent thinnings when stocking again reaches near, at, or above 100 percent
• When stocking approaches 100 percent –conduct detailed timber cruise, as in Step 1
• Repeat process for each thinning until final harvest of the stand
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Tree Class Distribution
TREE CLASS BA BA % QMD
Preferred 34 28 26.1
Desirable 29 23 23.1
Acceptable 41 33 22.2
Superior Pole 0 0 --
Growing Stock 104 84 23.7
Cutting Stock 17 14 16.4
Cull Stock 3 2 17.5
Inferior Pole 0 0 --
Overburden 20 16 16.8
TOTAL 124 100 22.0
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Conceptual ModelStand Quality Management
STAGE OF STAND DEVELOPMENT
Early/Mid Late
INITIALMedium AccSupP AccNoPole
QUALITYHigh DesSupP DesNoPole
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