伊朗西北部半人马花生境分布及连通性模拟

K. Almasieh, Kazem Negaresh, M. Mahmoodi
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摘要

光叶矢车菊,菊科植物,分布于伊朗西北部。本研究旨在确定西阿扎巴耶詹省、东阿扎巴耶詹省和阿尔达比尔省光叶Centaurea glastifolia的适宜栖息地和栖息地连通性。使用GLM、GAM、MARS、MaxEnt、RF和GBM的六个栖息地分布模型,选择了七个栖息地变量和36个存在点进行栖息地建模。由这些模型产生的集合图被用于使用电路方法的栖息地连通性建模。栖息地评估结果显示,所研究物种的适宜栖息地主要位于西阿扎巴耶詹省和阿尔达比尔省东部,其中距离农田的距离、年平均温度和距离牧场的距离对模型的贡献最大。栖息地连通性模型显示,目前的密度变化在西阿扎巴耶詹最高。Ardabil东部和东南部之间的电流密度移动被评估为显著,而西阿扎巴耶詹省和Ardabile省之间的电流强度移动相对较低。西阿扎尔巴耶扬的高电流密度运动表明该物种在该地区范围扩大的高扩散能力。目前的研究结果有助于了解光叶矢车菊的分布和扩散。
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Habitat distribution and connectivity modelling of Centaurea glastifolia L. in northwest of Iran
. Centaurea glastifolia , a plant species from the Asteraceae family, is distributed in the Northwest of Iran. This study carried out to determine suitable habitats and habitat connectivity of Centaurea glastifolia in three Provinces of West Azarbayejan, East Azarbayejan and Ardabil. Seven habitat variables and 36 presence points were selected for habitat modelling using six habitat distribution models of GLM, GAM, MARS, MaxEnt, RF and GBM. The ensemble map resulting from these models was used for habitat connectivity modelling using electrical-circuit method. Results of habitat evaluation revealed that suitable habitats of the species studied were mainly located in West Azarbayejan and east of Ardabil Provinces, for which distance from agricultural lands, mean annual temperature and distance from rangelands had the highest contribution to the model. Habitat connectivity modelling showed that the current density movement was highest in West Azarbayejan. Current density movement between East and Southeast of Ardabil was evaluated to be significant, whereas the current density movement between West Azarbayejan and Ardabil Provinces was relatively low. The high current density movement in West Azarbayejan indicates the species’ high dispersal ability in expanding its range across the area. The results of the current study could facilitate understanding of the distribution and dispersal of Centaurea glastifolia .
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