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Comparative vegetation survey with focus on cryptogamic covers in the high Arctic along two differing catenas

机译：比较植被调查，重点是沿着两个不同的连环山脉在北极高地的隐蔽植被

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Although cryptogamic covers are important ecosystem engineers in high Arctic tundra, they were often neglected in vegetation surveys. Hence we conducted a systematic survey of cryptogamic cover and vascular plant coverage and composition at two representative, but differing Arctic sites (Ny-angstrom lesund, Svalbard) along catenas with a natural soil moisture gradient, and integrated these data with physical-chemical soil properties. Soil samples were taken for comprehensive pedological and mineralogical analyses. Vegetation surveys were conducted based on classification by functional groups. Vascular plants were identified to species level. Correlation and multivariate statistical analysis were applied to determine the key environmental factors explaining vegetation patterns along the soil moisture gradients. We observed significant differences in gravimetric water, soil organic matter and nutrient contents along the moisture gradients. These differences were coincident with a shift in vegetation cover and species composition. While chloro- and cyanolichens were abundant at the drier sites, mosses dominated the wetter and vascular plants the intermediate plots. Twenty four vascular plant species could be identified, of which only six were present at both sites. Cryptogamic covers generally dominated with maximum areal coverage up to 70% and hence should be considered as a new additional syntaxon in future ground-truth and remote sensing based vegetation surveys of Svalbard. Multivariate analysis revealed that soil moisture showed the strongest relation between vegetation patterns, together with NH4-N and pH. In conclusion, soil moisture is a key driver in controlling cryptogamic cover and vegetation coverage and vascular plant species composition in high Arctic tundra.
机译：尽管隐蔽植被是北极高寒苔原上重要的生态系统工程师，但在植被调查中却常常被忽略。因此，我们在沿土壤自然水分梯度的连串连绵起伏的两个代表性但不同的北极站点（Ny-埃伦·勒松德，斯瓦尔巴特群岛）进行了隐地植被覆盖度和维管植物覆盖度和组成的系统调查，并将这些数据与物理化学土壤性质整合在一起。取了土壤样品进行综合的土壤学和矿物学分析。植被调查是按功能组分类进行的。确定了维管植物的物种水平。应用相关性和多元统计分析来确定解释沿土壤水分梯度的植被格局的关键环境因素。我们观察到沿水分梯度的重量水，土壤有机质和养分含量存在显着差异。这些差异与植被覆盖度和物种组成的变化相吻合。在较干燥的地方，虽然富含氯和氰胺类化合物，但在中间地带，苔藓主导着湿润和维管植物。可以鉴定出二十四种维管束植物物种，其中两个站点仅存在六种。隐蔽性植被通常以最大面积覆盖率高达70％为主，因此在未来的斯瓦尔巴特群岛基于地面真相和遥感的植被调查中应被视为新的附加语法。多变量分析表明，土壤水分与NH4-N和pH值之间的关系最密切。总之，土壤湿度是控制高寒带苔原的隐蔽植被和植被覆盖以及维管植物物种组成的关键驱动力。

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