Dendrometria ed elementi di assestamento forestale
(objectives)
At the end of the course the student will be able to: a) describe the principles of operation and the use of the main dendrometric instruments; b) illustrate the methods of measuring the diameter and height of a tree or a sample of trees in the context of the forest; c) set out the procedures for the elaboration of dendrometric measurements that allow the quantitative evaluation of the main characteristics of a forest stand: species composition, density, site fertility, age, structure, wood volume, yield and productivity; d) know the objectives of a forest management plan and the main parts of which it is composed. Through practical activities in forest and in the computer room the student will learn how to perform: the delimitation of a sample area, the measurement of the diameters of the trees and of the relative height, numbering tests angular, the extraction of woody cores. He will also be able to process the measurements carried out using a spreadsheet software in order to estimate dendrometric variables. The acquired knowledge will enable the student to choose, based on the objectives of the survey and the type of forest, the dendrometric instruments to be used for the various measures to be performed and the consequent procedures for processing the data collected. At the end of the course, the student will be able to draw up a report that illustrates with text, tables and graphs the methods of survey and the characteristics of the forest stand where he carried out the measurements. The set of activities carried out in the course will allow the student to be aware of the role that dendrometry plays in supporting silviculture and forest management.
|
Code
|
18191 |
Language
|
ITA |
Type of certificate
|
Profit certificate
|
Credits
|
6
|
Scientific Disciplinary Sector Code
|
AGR/05
|
Contact Hours
|
48
|
Type of Activity
|
Core compulsory activities
|
Teacher
|
PORTOGHESI Luigi
(syllabus)
Definition and goals of dendrometry The importance of sampling in dendrometry Sampling of tree dimeter - dendrometric caliper - shape and size of sampling plots - plot delimitation Measurement of stands: number of stems, basal area, mean diameter, top diameter Diameter distribution in classes Stand height - Blume Leiss hypsometer, Vertex hypsometer, forest clinometer: trigonometric principles and how to you use them - sampling criteria for tree height - modelling height-diameter curve: graphic and analitical methods - mean height, top height - height-diameter ratio Stand volume: - stereometric geometry: dendrometric prototypes - sectionwise measurements on felled trees: Huber formula, Smalian formula, Heyer formula, trapezium rule - tree volume tables and equation: how to use them - equations with one (dbh) or two (dbh, height) predictor variables - absolute and false form factor; general formula to calculate tree volume by sample tree - sample trees selection methods - volume of stacked wood - bark percentage Direct and indirect tree age estimation. - angle count sampling theory - Bitterlich relascope - choice of basal area factor - point sampling with and without measurement of diameter of counted trees Tree and stand growth - yield curve of even-aged stands; auxology rules - annual, average and percentage increment - yield tables - growth of uneven-aged stands Measurement of stand growth: general formula; Pressler formula; Schneider formula Growth estimation from successive forest inventories Introduction to forest planning - definition and goals of forest planning - role of forest owner and other stakeholders - contents of a forest plan - forest compartments - forest map of planned area.
(reference books)
Kershaw J.A., Ducey M.J., Beers T.W., Hursh B, 2017 - Forest mensuration, Fifth edition. John Wiley & Sons.
|
Dates of beginning and end of teaching activities
|
From to |
Delivery mode
|
Traditional
|
Attendance
|
not mandatory
|
Evaluation methods
|
Oral exam
|
|
|