Yield Studies

Long-Term Northeastern Silvicultural Treatment Evaluations
(References on
Next Page )

 

Authors

State

Years

Start Age

Site Index

Costs

MVI

Annual $/Ac
Heavy Cut

NPV

Annual $/Ac
Uncut

NPV

Annual $/Ac
Best Mgt

NPV

Price Year

                           

Niese et al

WI

1971 to 1992

~50

SM 64-68

yes

yes

44

-247

72

0

100

542

1990

                           

Miller

WV

1950 to 1983

~45

RO 80

no

no

39

365

46

426

70

654

1983

                           

Erickson et al

MI

1956 to 1988

~25

SM 64-69

no

no

17

136

43

no data

46

574

1988

                           

Lu & Buongiorno*

WI

1966 to 1984

unknown

unknown

yes

no

no data

-52

no data

no data

no data

245

1990

                           

Hseu & Buongiorno*

WI

1966 to 1984

unknown

unknown

no

yes

12

no data

12

no data

29

no data

1985

                           

Solomon & Leak**

(NH,VT)

not stated

unknown

SM 70

no

no

no data

no data

11

no data

23

no data

1983

                           

Averages

           

28

51

37

213

54

504

1987

 

COSTS & MVI NOTES: Costs include only marking and sales administration.

MVI indicates whether or not real market value increases are included in the calculations.

 

HEAVY CUT NOTES:

BEST MGT NOTES:

Niese et al 6" DBH

Niese et al 60 sq ft residual selection with q-value 1.3

Miller 5" DBH

Miller 15.5" DBH diameter limit

Erickson et al 5" DBH

Erickson et al 16" DBH diameter limit

Lu & Buorgiorno 5" DBH

Lu & Buorgiorno 15" DBH diameter limit for high value species, 10" DBH for low value species

Hseu & Buongiorno all treatments

Hseu & Buongiorno 77 sq ft residual, only grade hardwood species

  (heavy cut, uncut, other)

Solomon & Leak quality line thinnings

 

NPV NOTES:

Niese et al NPVs are in 1972 (start of period) @ 4% compared to uncut control.

Miller NPVs are really FV (future value) in 1983 (end of period) @ 6%--discounted for 33 years @ 4%.

Erickson et al NPVs are really MFVs (managed forest values = present values of projected future returns) in 1988 @ 4%.

Lu & Buongiorno NPVs are soil rents in 1984 @ 3%.

 

OTHER NOTES:

Wisconsin and Michigan studies are for northern hardwoods.  West Virginia study is for oak-hardwoods.

*Results are from computer simulation models based on state-wide forest inventory data.

**Results are from computer simulation models based on regional data for New England.

 

Karl Davies, Consulting Forester

Northampton, MA

August, 1999