Tree diameter performance in relation to site quality in smallholder timber production systems in Gunungkidul, Indonesia

G. E. Sabastian; P. Kanowski; E. Williams; J. M. Roshetko

doi:10.1007/s10457-016-0018-9

Tree diameter performance in relation to site quality in smallholder timber production systems in Gunungkidul, Indonesia

G. E. Sabastian^*, P. Kanowski, E. Williams, J. M. Roshetko

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Smallholder farmers’ choices of tree species in the Gunungkidul region have been limited by lack of management information. This paper describes activities to help inform farmers’ choices of three common timber species—Tectona grandis, Swietenia macrophylla and Acacia auriculiformis—in agroforestry systems in the region through (1) developing models predicting tree diameter growth based on reference growth function and the growth retardation performance and (2) estimating the contributions of site quality variables to the diameter growth retardation of ≤5 and >5-year-old stands. A total of 48 farms were selected, representing three slope ranges and two soil types, with a circular sample plot of 10 m radius established at each farm. A Quadratic model for each timber species indicated that the age of the tree explains a high percentage of the variance in diameter growth. Diameter growth varies with tree age and responds differently in each soil type and slope position. A set of site quality variables were able to predict retarded diameter performances of each tree species in two group ages and two soil types. These results suggest that the models can inform farmers’ choices of tree species and management.

Original language	English
Pages (from-to)	103-115
Number of pages	13
Journal	Agroforestry Systems
Volume	92
Issue number	1
DOIs	https://doi.org/10.1007/s10457-016-0018-9
Publication status	Published - 1 Feb 2018

Access to Document

10.1007/s10457-016-0018-9

Cite this

@article{f72942fcedf94bb68011d9bb50de2fe9,

title = "Tree diameter performance in relation to site quality in smallholder timber production systems in Gunungkidul, Indonesia",

abstract = "Smallholder farmers{\textquoteright} choices of tree species in the Gunungkidul region have been limited by lack of management information. This paper describes activities to help inform farmers{\textquoteright} choices of three common timber species—Tectona grandis, Swietenia macrophylla and Acacia auriculiformis—in agroforestry systems in the region through (1) developing models predicting tree diameter growth based on reference growth function and the growth retardation performance and (2) estimating the contributions of site quality variables to the diameter growth retardation of ≤5 and >5-year-old stands. A total of 48 farms were selected, representing three slope ranges and two soil types, with a circular sample plot of 10 m radius established at each farm. A Quadratic model for each timber species indicated that the age of the tree explains a high percentage of the variance in diameter growth. Diameter growth varies with tree age and responds differently in each soil type and slope position. A set of site quality variables were able to predict retarded diameter performances of each tree species in two group ages and two soil types. These results suggest that the models can inform farmers{\textquoteright} choices of tree species and management.",

keywords = "Biophysical characteristics, Diameter growth retardation, Multiple regression, Smallholder farmers",

author = "Sabastian, {G. E.} and P. Kanowski and E. Williams and Roshetko, {J. M.}",

note = "Publisher Copyright: {\textcopyright} 2016, Springer Science+Business Media Dordrecht.",

year = "2018",

month = feb,

day = "1",

doi = "10.1007/s10457-016-0018-9",

language = "English",

volume = "92",

pages = "103--115",

journal = "Agroforestry Systems",

issn = "0167-4366",

publisher = "Springer Netherlands",

number = "1",

}

TY - JOUR

T1 - Tree diameter performance in relation to site quality in smallholder timber production systems in Gunungkidul, Indonesia

AU - Sabastian, G. E.

AU - Kanowski, P.

AU - Williams, E.

AU - Roshetko, J. M.

PY - 2018/2/1

Y1 - 2018/2/1

N2 - Smallholder farmers’ choices of tree species in the Gunungkidul region have been limited by lack of management information. This paper describes activities to help inform farmers’ choices of three common timber species—Tectona grandis, Swietenia macrophylla and Acacia auriculiformis—in agroforestry systems in the region through (1) developing models predicting tree diameter growth based on reference growth function and the growth retardation performance and (2) estimating the contributions of site quality variables to the diameter growth retardation of ≤5 and >5-year-old stands. A total of 48 farms were selected, representing three slope ranges and two soil types, with a circular sample plot of 10 m radius established at each farm. A Quadratic model for each timber species indicated that the age of the tree explains a high percentage of the variance in diameter growth. Diameter growth varies with tree age and responds differently in each soil type and slope position. A set of site quality variables were able to predict retarded diameter performances of each tree species in two group ages and two soil types. These results suggest that the models can inform farmers’ choices of tree species and management.

AB - Smallholder farmers’ choices of tree species in the Gunungkidul region have been limited by lack of management information. This paper describes activities to help inform farmers’ choices of three common timber species—Tectona grandis, Swietenia macrophylla and Acacia auriculiformis—in agroforestry systems in the region through (1) developing models predicting tree diameter growth based on reference growth function and the growth retardation performance and (2) estimating the contributions of site quality variables to the diameter growth retardation of ≤5 and >5-year-old stands. A total of 48 farms were selected, representing three slope ranges and two soil types, with a circular sample plot of 10 m radius established at each farm. A Quadratic model for each timber species indicated that the age of the tree explains a high percentage of the variance in diameter growth. Diameter growth varies with tree age and responds differently in each soil type and slope position. A set of site quality variables were able to predict retarded diameter performances of each tree species in two group ages and two soil types. These results suggest that the models can inform farmers’ choices of tree species and management.

KW - Biophysical characteristics

KW - Diameter growth retardation

KW - Multiple regression

KW - Smallholder farmers

UR - http://www.scopus.com/inward/record.url?scp=84988913027&partnerID=8YFLogxK

U2 - 10.1007/s10457-016-0018-9

DO - 10.1007/s10457-016-0018-9

M3 - Article

SN - 0167-4366

VL - 92

SP - 103

EP - 115

JO - Agroforestry Systems

JF - Agroforestry Systems

IS - 1

ER -

Tree diameter performance in relation to site quality in smallholder timber production systems in Gunungkidul, Indonesia

Abstract

Access to Document

Other files and links

Fingerprint

Cite this