Taxonomic spectra of aboriginal and alien flora fractions in some sections of the Trans-siberian railway

Yulia K. Vinogradova
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Abstract

An inventory of “railway” flora within 6 sectors of Trans-Siberian railway with a total length of 5400 km (58% of Transsib) was carried out. It was noted that both, native and alien fractions of the flora, are similar by high proportion of monospecific families and the Asteraceae lead. The alien fraction differs from the native one by a lower total number of families in the taxonomic spectrum, a lower rank of the Poaceae and a higher rank of the Brassicaceae. The leading families triads (the term developed by A.P. Khokhryakov for aboriginal flora of the former USSR) are not applicable for the characterization of the “railway” fl ora. The taxonomic spectrum of “railway” flora depends to a greater extent on (artificially created) edaphic factors than on climatic conditions of the territory which the railroad passes through.
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横贯西伯利亚铁路部分路段的原生植物群和外来植物群的分类光谱
对总长 5400 公里(占西伯利亚大铁路的 58%)的西伯利亚大铁路 6 个区段内的 "铁路 "植物区系进行了清查。结果表明,植物区系中的本地部分和外来部分都很相似,单种科的比例很高,菊科植物居首位。外来植物区系与本地植物区系的不同之处在于:在分类学谱系中,外来植物区系的科总数较少,诗科排名较低,芸香科排名较高。主要科系三元组(A.P. Khokhryakov 为前苏联土著植物区系提出的术语)不适用于 "铁路 "植物区系的特征描述。铁路 "植物区系的分类谱系在更大程度上取决于(人为创造的)环境因素,而不是铁路经过地区的气候条件。
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