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首页> 外文期刊>Journal of Plant Research >Relative importance of habitat filtering and limiting similarity on species assemblages of alpine and subalpine plant communities
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Relative importance of habitat filtering and limiting similarity on species assemblages of alpine and subalpine plant communities

机译:筛选栖息地和限制相似性对高山和亚高山植物群落物种组合的相对重要性

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摘要

This study examined how habitat filtering and limiting similarity affect species assemblages of alpine and subalpine plant communities along a slope gradient on Mt. Norikura in central Japan. Plant traits (plant height, individual leaf area, specific leaf area (SLA), leaf linearity, leaf nitrogen and chlorophyll concentrations) and abiotic environmental factors (elevation, slope inclination, ground surface texture, soil water, soil pH, soil nutrient concentrations of NH4-N and NO3-N) were examined. The metrics of variance, range, kurtosis and the standard deviation of neighbor distance divided by the range of traits present (SDNDr) were calculated for each plant trait to measure trait distribution patterns. Limiting similarity was detected only for chlorophyll concentration. By contrast, habitat filtering was detected for individual leaf area, SLA, leaf linearity, chlorophyll concentration. Abiotic environmental factors were summarized by the principal component analysis (PCA). The first PCA axis positively correlated with elevation and soil pH, and negatively correlated with sand cover, soil water, NH4-N and NO3-N concentrations. High values of the first PCA axis represent the wind-exposed upper slope with lower soil moisture and nutrient availabilities. Plant traits changed along the first PCA axis. Leaf area, SLA and chlorophyll concentration decreased, and leaf linearity increased with the first PCA axis. This study showed that the species assemblage of alpine and subalpine plants was determined mainly by habitat filtering, indicating that abiotic environmental factors are more important for species assemblage than interspecific competition. Therefore, only species adapting to abiotic environments can distribute to these environments.
机译:这项研究检查了栖息地过滤和限制相似性如何沿着山坡上的坡度影响高山和亚高山植物群落的物种组合。日本中部的Norikura。植物特征(植物高度,单叶面积,比叶面积(SLA),叶线性,叶氮和叶绿素浓度)和非生物环境因素(海拔,坡度,地表质地,土壤水,土壤pH,土壤养分浓度)检查了NH4-N和NO3-N。计算每种植物性状的方差,范围,峰度和邻居距离的标准偏差除以存在的性状范围(SDNDr)的度量,以测量性状分布模式。仅针对叶绿素浓度检测到极限相似性。相比之下,对单个叶面积,SLA,叶线性,叶绿素浓度检测到栖息地过滤。通过主成分分析(PCA)总结了非生物环境因素。第一条PCA轴与海拔高度和土壤pH呈正相关,与沙层,土壤水,NH4-N和NO3-N浓度呈负相关。第一PCA轴的高值表示暴露在风中的上坡,土壤水分和养分利用率较低。植物性状沿第一个PCA轴改变。叶面积,SLA和叶绿素浓度降低,且叶片线性随PCA第一轴增加。这项研究表明,高山和亚高山植物的物种组成主要是通过栖息地过滤来确定的,这表明非生物环境因素对于物种组成比种间竞争更为重要。因此,只有适应非生物环境的物种才能分布到这些环境中。

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