Presentation on theme: "Lecture 13 FORE 3218 Forest Mensuration II Lecture 13 Growth and Yield Models Avery and Burkhart, Chapter 16."— Presentation transcript:
Lecture 13 FORE 3218 Forest Mensuration II Lecture 13 Growth and Yield Models Avery and Burkhart, Chapter 16
Lecture 13 FORE 3218 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 for forecasting stand dynamics are developed, ranging from tables, equations, to computer simulation models
Lecture 13 FORE 3218 Definition of yield The total amount available at a given point of time –gross volume –merchantable volume –biomass
Lecture 13 FORE 3218 Definition of yield (cont.) – Merchantability B Potential usable growth under present technology and policy C Growth actually removed and utilized A Total biological growth Growth 30 cm OMNR (1995) Scaling Manual Top D Merchantable 10 cm: Pj, Sb, Sw, Bf, Ce 16 cm: Pw, Pr, He, Po, Bw 20 cm: other hardwoods
Lecture 13 FORE 3218 Definition of growth The increase (increment) over a given period of time –Mean annual increment (MAI) –Periodic annual increment (PAI)
Lecture 13 FORE 3218 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 Whole stand models Diameter class models Individual tree models Simple Sophisticated Development Even-aged Uneven-aged Application Empirical Process Nature
Lecture 13 FORE 3218 Whole stand models 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 ) Equations Model type
Lecture 13 FORE 3218 Diameter class models Empirical stand table projections Equations Model type
Lecture 13 FORE 3218 Individual tree models Equations Model type Distance-dependent Distance-independent
Lecture 13 FORE 3218 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 version 1.0 Visualization - The power of arts
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