Forest Mensuration II Lecture 13 Growth and Yield
- Slides: 15
Forest Mensuration II Lecture 13 Growth and Yield Models Avery and Burkhart, Chapter 16
A few thoughts § Forest management decisions-making relies on accurate information about both current and future forest resource conditions § Stand-table projections for future growth based on the past may be most accurate for a limited period of time, but – Not reliable for long periods – Not necessarily useful for evaluate treatment alternatives because … § Therefore, many models forecasting stand dynamics are developed, ranging from tables, equations, to computer simulation models
Definition of yield § The total amount available at a given point of time – gross volume – merchantable volume – biomass
Definition of yield (cont. ) – Merchantability Growth A Total biological growth Top D 10 cm: Pj, Sb, Sw, Bf, Ce 16 cm: Pw, Pr, He, Po, Bw 20 cm: other hardwoods B Potential usable growth under present technology and policy C Growth actually removed and utilized Merchantable 30 cm OMNR (1995) Scaling Manual
Definition of yield (cont. ) Plonski 1974 Gross Merchantability
Definition of growth § The increase (increment) over a given period of time – Mean annual increment (MAI) – Periodic annual increment (PAI)
Definition of growth (cont. ) MAI Lecture 13 FORE 3218
Definition of growth (cont. ) PAI Lecture 13 FORE 3218
Relationships between yield and growth Lecture 13 FORE 3218
Types of Models Nature Whole stand models Application Development Even-aged Simple Empirical Diameter class models Individual tree models Lecture 13 FORE 3218 Process Uneven-aged Sophisticated
Whole stand models Model type § Density-free models – Normal yield tables – Empirical yield tables for average stands § Variable density models – Predict yield – Predict growth (g 12) and yield (V 1) Lecture 13 FORE 3218 Equations
Diameter class models Model type § Empirical stand table projections Lecture 13 FORE 3218 Equations
Individual tree models Model type §Distance-dependent §Distance-independent Lecture 13 FORE 3218 Equations
Which type of models is best suited for the following situations? Why? § Depends on purposes of modeling…, but if … – Even-aged, single species stands? – Uneven-aged single species stands? – Even- and uneven-aged, mixed-species stands? Lecture 13 FORE 3218
FVS Ontario Visualization The power of arts Lecture 13 FORE 3218 version 1. 0
- What is theoretical yeild
- Objectives of forest mensuration
- Forest mensuration definition
- Lines of mensuration
- Dividend yield and capital gains yield
- Difference between actual yield and theoretical yield
- Actual-theoretical/actual
- Percentage yield formula
- Non constant growth model
- Dividend yield and capital gains yield
- How to calculate theoretical yield
- Current yield vs yield to maturity
- Bond valuation theorems
- Discount bond
- Rolled throughput yield vs first pass yield
- 01:640:244 lecture notes - lecture 15: plat, idah, farad