|
|
10th National Forest Inventory (NFI10)
Field Measurements
A field team of 1+1 or 1+2 persons visits each field plot. The plots are located with a GPS, and differential correction to plot co-ordinates is made afterwards. The team leader observes characteristics of the forest stand, in which the mid point of the field plot is located. At the same time, the team assistants measure a tree plot. Trees belonging to the plot are selected with an angle gauge (relascope).
The main thematic groups of observed variables at stand and tree levels are the following:
Selecting trees that belong to the sample plot by a relascope.
 Stand data
- Administrative data: owner group, restrictions for forestry etc.
- Site description: land use class (both national and FAO definitions), main soil type, site productivity class, soil texture etc.
- Description of growing stock: crown storeys, species composition, crown cover, development class, age, mean height, damages etc.
- Accomplished and proposed measures: accomplished and proposed cuttings, silvicultural measures, soil scarification, draining.
Tree data
- Tally trees (all trees selected by relascope): diameter at breast height, tree species, quality class and crown storey class
- Sample trees (every 7th tally tree): height, diameter at 6 m height, age, increments of diameter and height, thickness of bark, description of timber assortments, damages etc.
- Dead tree data: only on permanent plots; see measurements in the NFI
Details of the field measurements are described in the Field Manual (in Finnish, pdf 639 kB) and in the Appendices (in Finnish, pdf 737 kB).
|
