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Paper Information

Journal:   IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH   2016 , Volume 22 , Number 4 #a00464; Page(s) 625 To 638.

Providing statistical models to estimate the production of rangeland species (Case study: Dizaj Batchi and Ghotor Ranglands of Khoy)

Author(s):  Alilou f., KEIVAN BEHJOU F.*, Moatamedi j.
* Department of Wood and Paper Science and Technology, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran
The current study was aimed to investigate the relationship between the production of Artemisia aucheri and Agropyron trichophorum and their morphological features and providing regression models. For this purpose, three rangeland sites were selected in Dizaj Batchi and Ghotor Ranglands of Khoy. Stratified random sampling was used within one square meter plots at 10-m intervals and along 100-m transects. Various regression models including one-dimensional, two-dimensional, and multiple regression models were applied. Among the significant models, the best model was selected at the species level based on model evaluation criteria. The results showed that each of the features investigated had a significant relationship with production. One-dimensional models demonstrated better results and crown diameter (D1) in both species, and all three range sites was chosen as the most efficient morphological feature in order to estimate production. According to the obtained results, suitable models were recommended for the study rangelands and study species.
Keyword(s): Estimation of plant production,morphological characteristics,statistical models,Dizaj Batchi and Ghotor Rangelands
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