NGUYEN, Van Sinh 2007 IUFRO All Division 5 Conference Sustainable utilization of forest products 1

F-STRUCTRE A&S – A Tool for Forest Structure Analysis and Simulation Nguyen Van Sinh Vietnamese Academy of Science and Technology Institute of Ecology and Biological Resources Department of Plant Ecology 18 Hoang Quoc Viet, Nghia Do, Cau Giay Hanoi-Vietnam

3 Introduction Forest planning and management require exact information from a detailed silvicultural analysis Calculation of forest structure parameters for silvicultural analysis is a huge work Complete studies of large forest areas are almost always impossible  The data for the analysis are almost always collected from sample plots

4 Aim of work and methods To create a tool for calculating parameters of forest structure for silvicultural analysis is the aim of this work The scientific basis is the generally used forest structure parameters and their calculation methods Calculation of forest structure parameters before and after extracting data from a data table will allow to simulate effects of silvicultural measures, of an exploitation or of a natural calamity

5 Introduction to F-Structure A&S: main window The main window has a menu bar and a toolbar

6 The child windows are of table type Introduction to F-Structure A&S: child windows

7 The first column contains the name of the plot; The second column contains the tree species name; The third column contains the diameter of the tree; The fourth column contains the height of the tree; The other column can contain any information of the tree, normally the feature of the tree that allows user to extract data; If a row is used for comments, it must be marked with three stars in the first cell. Introduction to F-Structure A&S: data input

8 The input of the data must be done by typing in a child window Introduction to F-Structure A&S: data input

9 Before starting a calculation the data must be selected By choosing ‘Data analysis/Select data’ submenu a dialog box will be displayed where we can set the range of data to be involved in calculation Introduction to F-Structure A&S: data select

10 By pushing the ‘Quick selection’ button on the ‘Select data’ dialog box the ‘Quick select’ dialog box will be displayed with default range of data for three tree Compartments: A, B and C Introduction to F-Structure A&S: data select

11 Choosing a tab and then click OK, the values from selected tab will be transferred to the ‘Select data’ dialog box After setting the range of all three compartments, we can click on ‘ABC’ button to choose to do calculation for all three compartments at once Introduction to F-Structure A&S: data select

12 To start calculation we choose the submenu ‘Data analysis/Execute’ The calculation will be conducted according to our data selection If we have set the data range in the ‘Select data’ dialog box, the program will do calculation for the data selected If we have set the data range for all three compartments in the ‘Quick select’ dialog box and clicked on the ‘ABC’ button, the program will do calculation for all three compartments at once. Introduction to F-Structure A&S: calculation

13 The results of calculation for each compartment will be displayed in two child windows:  One child window contains the diversity indices  The other one contains all other calculated structure parameters of the forest If we have chosen all three compartments to be calculated at once there will be six windows with results displayed at the end of calculation. Introduction to F-Structure A&S: displaying the results

14 Introduction…: calculation for 3 compartments at once

15 Introduction…: calculation for selected data range

16 Introduction…: results: statistics of plots

17 Introduction…: results: statistics of plots

18 Introduction…: results: statistics of plots

19 Introduction…: results: statistics of plots

20 Introduction…: results: statistics of plots

21 Logging, diseases, or storm… can have definite effect on the forest like destroying some species or some group of trees of a species Extracting data from a data set with following recalculating the parameters of forest structure will allow us to simulate the effect of above mentioned cases By choosing ‘Data analysis/Extract data’ submenu, the program will display the ‘Extract data’ dialog box for setting extracting options Introduction to F-Structure A&S: simulation

22 Introduction to F-Structure A&S: simulation Setting options for extracting data: choose all trees of the species ‘Saraca dives’ with a diameter from 50 to 100 cm

23 Introduction to F-Structure A&S: simulation After options for extracting data have been set, clicking on the ‘OK’-button will cause the program display a dialog box where we can choose the way to hanle the extracted data: Save extracted data to a file Paste the data to a new window Maintain only the extracted data Delete the extracted data

24 Introduction to F-Structure A&S: simulation The dialog box for choosing the way to handle the extracted data

25 Conclusions: -The data analysis can be very easy with using F- Structure A&S: by choosing to calculate for three tree compartments at once, after a mouse click we have two child windows of data for each tree compartment (one with diversity indices and the other with other forest structure parameters) -Effect of silvisultural measures, of an exploitation or of a natural calamity can be simulated by comparing results of calculation of forest structure parameters before and after extracting trees from data table

26 Thank you for your attention!