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A multiple-scale analysis of plant species richness, vegetation, landscape heterogeneity, and spectral diversity along an arctic river.

机译：对北极河沿岸植物物种丰富度，植被，景观异质性和光谱多样性的多尺度分析。

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Arctic landscapes are the subject of intensive ecological study in light of (1) the circumpolar nature of the biome, (2) the pristine nature of the ecosystem, and (3) the pace of land use and projected climate change in high latitudes. Riparian areas are plant diversity hotspots, harboring over 75% of the regional floras in some arctic areas. Understanding the patterns and environmental controls of plant distributions and diversity within riparian and upland areas is important if we are to predict changes in ecosystem patterns and processes.; This study examines the relationships in the Hood River valley of plant species richness, the environment, community composition, the structure of plant diversity (i.e., the relationships of {dollar}alpha, beta,{dollar} and {dollar}gamma{dollar} diversity), and patterns of remotely-sensed spectral heterogeneity from the plot level (10 m{dollar}sp2){dollar} to regional scales (10,000 km{dollar}sp2).{dollar} The goals of this research are to (1) understand patterns of species richness at a variety of scales, (2) describe and map plant communities and vegetation, (3) use remote sensing to estimate species richness, and (4) map biodiversity hotspots.; The vascular flora for the area includes 210 species. Species richness increases along the river to the coast and variation is positively correlated with environmental heterogeneity. The most significant component of this heterogeneity is an increase in the range of soil pH.; Twenty-four plant community types are described using the Braun-Blanquet approach. An increase in site species richness is correlated with an increase in the number of communities {dollar}(rsp2=0.323, P=0.0173){dollar} and {dollar}beta{dollar} diversity {dollar}(rsp2=0.388, P=0.0075),{dollar} rather than an increase in the {dollar}alpha{dollar} diversity of individual communities {dollar}(rsp2=0.018, P=0.6045).{dollar} Moisture and pH controlled most of the differences in composition between communities. Patterns of species richness differed among vascular, bryophyte, and lichen species. Vascular plant {dollar}alpha{dollar} diversity had a peak in richness at pH 6.5 {dollar}(rsp2=0.214, P<0.0001).{dollar}; A map of the vegetation of the region was derived from a supervised classification of Landsat TM data. Estimates of plant species richness were derived using variation in the normalized difference of vegetation index (NDVI) and weighted abundance of mapped vegetation types. Together, these explain 86% of the variance in species richness of sample areas (adj. {dollar}rsp2=0.861, P<0.0001).{dollar} Species richness hotspots in the region are concentrated along riparian corridors.
机译：鉴于（1）生物群落的极地性质，（2）生态系统的原始性质以及（3）高纬度地区的土地利用速度和预计的气候变化，北极景观是深入生态研究的主题。河岸地区是植物多样性的热点地区，在某些北极地区拥有超过75％的区域植物区系。如果我们要预测生态系统模式和过程的变化，那么了解河岸和高地地区植物分布和多样性的模式和环境控制很重要。这项研究研究了胡德河谷中植物物种丰富度，环境，群落组成，植物多样性结构之间的关系（即{dollar} alpha，beta，{dollar}和{dollar} gamma {dollar}之间的关系。多样性，以及从样地水平（10 m {dollar} sp2）{dollar}到区域尺度（10,000 km {dollar} sp2）的遥感光谱异质性模式。这项研究的目标是（1 ）了解各种规模的物种丰富度模式；（2）描述和绘制植物群落和植被图；（3）使用遥感来估计物种丰富度；以及（4）绘制生物多样性热点图；该地区的维管植物群包括210种。沿河到海岸的物种丰富度增加，其变化与环境异质性正相关。这种非均质性的最重要组成部分是土壤pH范围的增加。使用Braun-Blanquet方法描述了二十四种植物群落类型。站点物种丰富度的增加与社区数量的增加（美元）（rsp2 = 0.323，P = 0.0173）{美元}和{美元}β{美元}的多样性{美元}（rsp2 = 0.388，P = 0.0075），而不是增加单个社区的美元（α）多样性（美元）（rsp2 = 0.018，P = 0.6045）。{美元}水分和pH值控制着两者之间大部分的差异社区。物种丰富度的模式在维管，苔藓植物和地衣物种之间有所不同。脉管植物{美元}α{美元}的多样性在pH 6.5时具有丰富度的峰值{美元}（rsp2 = 0.214，P <0.0001）。该区域的植被图是从Landsat TM数据的监督分类中得出的。利用植被指数归一化差异（NDVI）的变化和所映射植被类型的加权丰度来估算植物物种的丰富度。这些共同解释了样本区域物种丰富度变化的86％（ads。{dolal} rsp2 = 0.861，P <0.0001）。{dollar}该地区的物种丰富度热点集中在沿河岸的走廊上。

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