EVALUATION OF K-TREE DISTANCE AND FIXED-SIZED PLOT SAMPLING IN ZAGROS FORESTS OF WESTERN IRAN

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RAMEZANI H.; GRAFSTROM A.; NAGHAVI H.; FALLAH A.; SHATAEE SH.; SOOSANI J.

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Journal: JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST) Year:2016 | Volume:18 | Issue:1 Page(s): 155-170

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Title

EVALUATION OF K-TREE DISTANCE AND FIXED-SIZED PLOT SAMPLING IN ZAGROS FORESTS OF WESTERN IRAN

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Keywords

BOUNDARY CORRECTIONQ3

MONTE-CARLO SIMULATIONQ3

OAK FORESTQ3

PLOT LESS SAMPLINGQ3

VARIABLE PLOT SAMPLINGQ3

Abstract

Threek -tree distance and fixed-sized plot designs were used for estimating tree density in sparse OAK FORESTs. These forests cover the main part of the Zagros mountain area in western Iran. They are non-timber-oriented forest but important for protection purposes.The main objective was to investigate the statistical performance ofk -tree distance and fixed-sized plot designs in the estimation of tree density. In addition, the cost (time required) of data collection using bothk -tree distance and fixed-sized plot designs was estimated. Monte-Carlo sampling simulation was used in order to compare the different strategies. The bias of thek -tree distance designs estimators decreased with increasing the value ofk. The Moore’s estimator produced the smallest bias, followed by Kleinn and Vilcko and then Prodan. In terms of cost-efficiency, Moore’s estimator was the best and Prodan’s estimator was superior to Kleinn and Vilcko’s estimator. Cost-efficiency ofk tree distance design is related to three factors: sample size, the value ofk, and spatial distribution of trees in a forest stand. Moore’s estimator had the best statistical performance in terms of bias, in all four-study sites. Thus, it can be concluded that Moore’s estimator can have a better performance in forests with different tree distribution.

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APA: Copy

RAMEZANI, H., GRAFSTROM, A., NAGHAVI, H., FALLAH, A., SHATAEE, SH., & SOOSANI, J.. (2016). EVALUATION OF K-TREE DISTANCE AND FIXED-SIZED PLOT SAMPLING IN ZAGROS FORESTS OF WESTERN IRAN. JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST), 18(1), 155-170. SID. https://sid.ir/paper/62498/en

Vancouver: Copy

RAMEZANI H., GRAFSTROM A., NAGHAVI H., FALLAH A., SHATAEE SH., SOOSANI J.. EVALUATION OF K-TREE DISTANCE AND FIXED-SIZED PLOT SAMPLING IN ZAGROS FORESTS OF WESTERN IRAN. JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST)[Internet]. 2016;18(1):155-170. Available from: https://sid.ir/paper/62498/en

IEEE: Copy

H. RAMEZANI, A. GRAFSTROM, H. NAGHAVI, A. FALLAH, SH. SHATAEE, and J. SOOSANI, “EVALUATION OF K-TREE DISTANCE AND FIXED-SIZED PLOT SAMPLING IN ZAGROS FORESTS OF WESTERN IRAN,” JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY (JAST), vol. 18, no. 1, pp. 155–170, 2016, [Online]. Available: https://sid.ir/paper/62498/en

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