Comparison of T-Square, Point Centered Quarter, and N-Tree Sampling Methods in Pittosporum undulatum Invaded Woodlands
Joint Authors
Silva, Lurdes Borges
Alves, Mário
Elias, Rui Bento
Silva, Luís
Source
International Journal of Forestry Research
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-01-11
Country of Publication
Egypt
No. of Pages
13
Main Subjects
Abstract EN
Tree density is an important parameter affecting ecosystems functions and management decisions, while tree distribution patterns affect sampling design.
Pittosporum undulatum stands in the Azores are being targeted with a biomass valorization program, for which efficient tree density estimators are required.
We compared T-Square sampling, Point Centered Quarter Method (PCQM), and N-tree sampling with benchmark quadrat (QD) sampling in six 900 m2 plots established at P.
undulatum stands in São Miguel Island.
A total of 15 estimators were tested using a data resampling approach.
The estimated density range (344–5056 trees/ha) was found to agree with previous studies using PCQM only.
Although with a tendency to underestimate tree density (in comparison with QD), overall, T-Square sampling appeared to be the most accurate and precise method, followed by PCQM.
Tree distribution pattern was found to be slightly aggregated in 4 of the 6 stands.
Considering (1) the low level of bias and high precision, (2) the consistency among three estimators, (3) the possibility of use with aggregated patterns, and (4) the possibility of obtaining a larger number of independent tree parameter estimates, we recommend the use of T-Square sampling in P.
undulatum stands within the framework of a biomass valorization program.
American Psychological Association (APA)
Silva, Lurdes Borges& Alves, Mário& Elias, Rui Bento& Silva, Luís. 2017. Comparison of T-Square, Point Centered Quarter, and N-Tree Sampling Methods in Pittosporum undulatum Invaded Woodlands. International Journal of Forestry Research،Vol. 2017, no. 2017, pp.1-13.
https://search.emarefa.net/detail/BIM-1166844
Modern Language Association (MLA)
Silva, Lurdes Borges…[et al.]. Comparison of T-Square, Point Centered Quarter, and N-Tree Sampling Methods in Pittosporum undulatum Invaded Woodlands. International Journal of Forestry Research No. 2017 (2017), pp.1-13.
https://search.emarefa.net/detail/BIM-1166844
American Medical Association (AMA)
Silva, Lurdes Borges& Alves, Mário& Elias, Rui Bento& Silva, Luís. Comparison of T-Square, Point Centered Quarter, and N-Tree Sampling Methods in Pittosporum undulatum Invaded Woodlands. International Journal of Forestry Research. 2017. Vol. 2017, no. 2017, pp.1-13.
https://search.emarefa.net/detail/BIM-1166844
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1166844