Sampling Alternatives for Eucalyptus Trees in Integrated Crop‑Livestock-Forest System
Material type:
ArticleSubject(s): Online resources:
In:
Floresta e Ambiente (Brazil) v. 26(3) p. 1-9; (2019)Summary:
ABSTRACT
The aim of this paper was to compare methods and sampling procedures applied to eucalyptus
grown under different spatial arrangements in an integrated crop-livestock-forest system (ICLF).
The study was carried out in Sinop county, Mato Grosso state, Brazil. Arrangements combining
fixed and variable area methods to simple random and systematic sampling were tested. Precision,
accuracy, efficiency, and diameter-distribution measurements were used for selection of the
best sampling arrangement. The sampling intensity, sample unit optimal size and the relative
efficiency have been changed depending on the spatial arrangement for 10% sampling error and
95% probability level. The fixed area method based on systematic sampling, as well as smaller
sample units with eight to nine plants (48 m2to 54 m2 ) were the most accurate; however, larger plots
(192 m2to 216 m2) were more efficient. All sample units size provided good estimates on
the number of trees by diameter classes.
Keywords: forest inventory, Eucalyptus grandis × Eucalyptus urophylla, agroforestry systems.
| Item type | Current library | Collection | Call number | Vol info | Status | Date due | Barcode |
|---|---|---|---|---|---|---|---|
Periódicos
|
Biblioteca Nacional de Agricultura - Binagri Agrobase - Periódicos | Periódicos agrícolas | 2019 26(3) | Online | 2025-0451 |
Publicação on-line; 34 ref.; 3 tables; 2 illus.; Summary (En)
ABSTRACT
The aim of this paper was to compare methods and sampling procedures applied to eucalyptus
grown under different spatial arrangements in an integrated crop-livestock-forest system (ICLF).
The study was carried out in Sinop county, Mato Grosso state, Brazil. Arrangements combining
fixed and variable area methods to simple random and systematic sampling were tested. Precision,
accuracy, efficiency, and diameter-distribution measurements were used for selection of the
best sampling arrangement. The sampling intensity, sample unit optimal size and the relative
efficiency have been changed depending on the spatial arrangement for 10% sampling error and
95% probability level. The fixed area method based on systematic sampling, as well as smaller
sample units with eight to nine plants (48 m2to 54 m2 ) were the most accurate; however, larger plots
(192 m2to 216 m2) were more efficient. All sample units size provided good estimates on
the number of trees by diameter classes.
Keywords: forest inventory, Eucalyptus grandis × Eucalyptus urophylla, agroforestry systems.
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