向西北的

The representative families are Dryopteridaceae, Athyriaceae, Polypodiaceae, Thelypteridaceae, Selaginellaceae and Aspleniaceae. The main genera are Dryopteris, Selaginella, Asplenium, Arachniodes, Pteris, Allantodia and Plagiogyria. The top families' distribution types are cosmopolitan and pantropic ones, the main genera are pantropical ones, while species distribution type belong to the east Asia type and represents the feature of subtropics transition to warm temperated areatype. As for the order of closeness, the sequence of pteridophytes floristic relations between Songyang and the adjacent regions goes as Southwest China, South China, Central China, Japan, North China, Northwest China and Northeast China. The six upland pteridophytes next to Songyang can be put into the same natural flora because of its closest relationship. But compared with other 11 upland fern flora in China, fern in Songyang is not rich enough. There are 37 species endemic to China in Songyang.

结果表明，松阳蕨类植物共有38科72属161种7变种；优势科为鳞毛蕨科、蹄盖蕨科、水龙骨科、金星蕨科、卷柏科、铁角蕨科，优势属为鳞毛蕨属、卷柏属、铁角蕨属、复叶耳蕨属、凤尾蕨属、短肠蕨属、瘤足蕨属；科的分布以世界分布和泛热带分布为主，属的分布以泛热带分布为最多，种以东亚分布类型为主，特别是中国—日本分布类型最多，表现出亚热带向暖温带过渡的特点；本区与邻近地区蕨类植物区系关系的密切程度由大到小依次为西南、华南、华中、日本、华北、西北、东北；与邻近的6个山地蕨类植物区系的亲缘关系密切，可以划为同一自然区；与国内11山地蕨类植物区系相比，松阳的蕨类植物丰富程度不高；松阳拥有37种中国特有蕨类植物及一些珍稀蕨类植物，有较高的保护价值。

The chemical weathering index, K/Na ratio, eluvial coefficientand A-CN-K diagram , can availably indicate the evolution of pedogenic environment. The A-CN-K and CIA-K/Na diagram showed that the Holocene paleosol was in the primary stage of weathering, which K-feldspar went through weak weathering and K was less leached with much leach of Ca and Na. The intensity of weathering went stronger gradually from west to east in the Weihe Valley.

对化学风化指数、K/Na比值、残积系数等化学综合参数的研究结果显示，各项地球化学参数可有效指示成壤环境与成壤强度；从A-CN-K风化趋势图和CIA-K/Na比较图中可知，渭河流域三个剖面风化程度最高的全新世古土壤基本处于同一风化阶段，即脱Ca、Na，尚未到达脱K的阶段，还是风化较弱的初级阶段，但三者的风化程度是存在差异的，风化程度XJN剖面最低，JYC-N剖面最高，ETC剖面介于其中，说明渭河流域自西北向东南风化程度逐渐增强。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。