estV {forestGYM}R Documentation

Estimation of stand volume growth dynamic based on Clutter model.

Description

The dynamic prediction of stand volume in a specified prediction year is based on the Clutter model.

Usage

estV(b0,b1,b2,b3,a0,a1,B1,t1,t2,SI)

Arguments

b0

Regression coefficients of Clutter model.

b1

Regression coefficients of Clutter model.

b2

Regression coefficients of Clutter model.

b3

Regression coefficients of Clutter model.

a0

Regression coefficients of Clutter model.

a1

Regression coefficients of Clutter model.

SI

Site index

t1

Initial stand age,the unit is year.

t2

Stand age in the future period corresponding to volume prediction,the unit is year.

B1

Basal area in t1, the unit is m2/ha.

Details

Both t1 and t2 should be integers, the value of t2 should be bigger than t1,the unit is year.

Value

prediction results of stand volume in a specified prediction year is based on the Clutter model.

Author(s)

Zongzheng Chai, chaizz@126.com

References

Clutter, J. L. (1963) Compatible Growth For Loblolly by the Southeastern, Forest Science, 9(3), pp. 354–371. Sullivan, A. D. and Clutter, J. L. (1972) A Simultaneous Growth and Yield for Loblolly Pine, Forest Science, 18(1), pp. 76–86.

Examples

#Volume prediction for a specific year.
estV(b0=2.0137,b1=0.0795,b2=-16.9509,b3=0.7924,
     a0=1.1656,a1=0.1376,
     B1=3.1,t1=10,t2=100,SI=12)

#Volume prediction for several specific years.
estV(b0=2.0137,b1=0.0795,b2=-16.9509,b3=0.7924,
     a0=1.1656,a1=0.1376,
     B1=3.1,t1=10,t2=c(15,30,46,85),SI=12)

#Volume prediction for continuous years.
estV(b0=2.0137,b1=0.0795,b2=-16.9509,b3=0.7924,
            a0=1.1656,a1=0.1376,
            B1=3.1,t1=10,t2=11:100,SI=12)

[Package forestGYM version 1.0.0 Index]