Please use this identifier to cite or link to this item:
http://hdl.handle.net/2067/2150
Title: | Assessing the attributes of scattered trees outside the forest by a multi-phase sampling strategy | Authors: | Baffetta, Federica Corona, Piermaria Fattorini, Lorenzo |
Keywords: | Forest inventories;Multi-phase sampling strategy;Tree outside forest | Issue Date: | 2011 | Publisher: | Oxford University Press | Source: | Baffetta, F., Corona, P., Fattorini, F. 2011. Assessing the attributes of scattered trees outside the forest by a multi-phase sampling strategy. "Forestry" 84 (3):315-325 | Abstract: | A sampling strategy to be used with multi - phase forest inventories is proposed for assessing scattered trees outside the forest on large territories. The fi rst phase is carried out by means of a systematic search over the area to be inventoried. The area is partitioned into regular polygons of the same size and points are randomly located, one per polygon. Subsequently, in the second phase, the land cover class of the fi rst-phase points is determined by very high - resolution remotely sensed imagery and a sample of points are selected from each land cover stratum. Then, the number of trees outside the forest lying within plots at the sampled points is recorded on the imagery. Finally, in the third phase, a subsample is selected from the second-phase samples of each stratum and the biophysical attributes of trees within plots are measured in the fi eld. Approximately unbiased estimators of abundance and of totals and averages of biophysical attributes are achieved in the second and third phase , respectively, together with the estimators of the corresponding variances. A simulation study is performed in order to assess the accuracy of the strategy under random and aggregated distributions of trees. The sampling errors achieved in the second phase using sampling fractions of ~ 0.3 per cent of trees vary from 6 to 13 per cent , whereas the errors achieved in the third phase using sampling fractions of ~ 0.15 per cent vary from 15 to 31 per cent . The results obtained from three case studies carried out in Italy confi rm the accuracy levels achieved in the simulation. |
Description: | L'articolo è disponibile sul sito dell'editore http://forestry.oxfordjournals.org/ |
URI: | http://hdl.handle.net/2067/2150 | ISSN: | 0015-752X | DOI: | 10.1093/forestry/cpr015 |
Appears in Collections: | DiSAFRi - Archivio della produzione scientifica |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
FORESTRY_scattered trees1.pdf | 145.92 kB | Adobe PDF | View/Open |
SCOPUSTM
Citations
10
15
Last Week
0
0
Last month
0
0
checked on Sep 18, 2023
Page view(s)
92
Last Week
0
0
Last month
6
6
checked on Mar 16, 2024
Download(s)
113
checked on Mar 16, 2024
Google ScholarTM
Check
Altmetric
All documents in the "Unitus Open Access" community are published as open access.
All documents in the community "Prodotti della Ricerca" are restricted access unless otherwise indicated for specific documents