文章基本信息

标题：Evaluating the Effects of Study Scale on Spatial Patterns of three Range Plant Species Using Quadrate Indices and Point Pattern Analysis in Chaharmahal- Bakhtirai Province Rangelands
本地全文：下载
作者：M. Safaei ; H. Bashari ; H. A. Shirmardi 等
期刊名称：Iranian Journal of Applied Ecology
印刷版ISSN：2476-3128
电子版ISSN：2476-3217
出版年度：2016
卷号：5
期号：17
页码：37-49
DOI：10.18869/acadpub.ijae.5.17.37
出版社：Isfahan University of Technology
摘要：This study aimed to investigate the spatial patterns of Acanthophyllum microcephalum Boiss, Nepeta glomerulosa Boiss and Hertia angustifolia and evaluate the effects of study scale on spatial patterns of three range plant species in Ghale-Gharak research-station located in Shahr-e-Kord. 40 points with a distance of five meters from each other were selected for sampling of vegetation along four 50 m transects using a random-systematic approach. The species spatial patterns were measured by 6 different distance-based methods including Hopkines, Johnson-and-Zimer, Eberhardt, Holgate, Hines and T-Square-index. A 100 m 2 reference site (10 by 10 m) was selected to record the species co-ordinates and conduct point pattern analysis. The spatial patterns of the species were determined in 3 scales of 10 × 10, 5 × 10 and 5 × 5 meters to highlight the effects of scale on spatial patterns of vegetation. According to the results, H. angustifolia showed randomized spatial patterns due to its seed dispersal ability. N. glomerulosa and A. microcephalum showed a clustered spatial pattern because their seed are in achene form and fall next to these species. All the 3 species had a clustered pattern when the scale of point pattern analysis was decreased. Identifying these plant spatial patterns and their controlling factors ) such as seed dispersal mechanisms of the species and sampling scale) are required to select the best sampling strategy in rangeland assessment programs.
关键词：Distance based index; Point pattern analysis; Rangeland ecosystems; Shahr-e-Kord.; Spatial pattern.