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)