Environmental factors affecting on distribution of plant communities in semiarid area (Case study: Kamyaran rangelands, Iran)
Environmental factors affecting on distribution of plant communities in semiarid area (Case study: Kamyaran rangelands, Iran)
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发表时间：
2012
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影响因子：
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通讯作者：
B. Gholinejad;Asghar Farajollahi;H. Pouzesh
中科院分区：
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作者：
B. Gholinejad;Asghar Farajollahi;H. Pouzesh
本研究的目的是调查的影响植物群落分布的环境因素，作为一个最重要的结构在半干旱牧场通过实地考察和各种环境因素的测量。然而，不同的植物群落进行了研究，在一些卡米亚兰牧场在约10000公顷的不同特征（海拔和坡度），在每个社区4个样带建立了300米长。在每个样带中沿沿着20 m距离建立15个样地（1 m2）。在每个样地中确定现有物种的种类和数量以及植被覆盖率。还测量了各种土壤参数，如物理因素（土壤深度、土壤质地）和化学因素，如酸度、有机质、电导率、石灰和氮。土壤和植被数据采用多元分析、主成分分析等方法进行分析。结果表明，在环境因子中，粘粒、砂粒、氮素、坡度和海拔5个因子与主成分的相关性最高，是半干旱草地植物群落分布的最有效影响因子。
The aim of this study was to survey the effective environmental factors on distribution of plant communities as one of the most important structure in semi-arid rangelands via field visits and various environmental factors measurements. However, various plant communities was studied in some part of kamyaran rangelands in about 10000 ha within different characteristics (altitudes and slopes), in each community 4 transects established with 300m length. 15 plots (1m2) established along each transect in 20 meter distances. The kind and the amount of existing species and the percentage of vegetation cover were determined in each plot. Various soil parameters such as physical factors (soil depths, soil texture) and chemical factors such as amount acidity, organic matter, electrical conductivity, lime and nitrogen were also measured. Soil and plant data were analyzed with multivariate analyzing, principal component analyzing (PCA). The results showed that among environmental factors, 5 factors including clay, sand, nitrogen, slope and altitude have the highest correlation with principal components and are the most effective influencing factors on plant communities’ distribution in semi-arid rangelands.