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Validation of a simplified point frame method to detect change in tundra vegetation

机译：验证简化的点框架方法以检测苔原植被的变化

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The point frame method is ideal for vegetation monitoring because exact locations may be precisely resampled over time. Many researchers, including those associated with the International Tundra Experiment (ITEX), have used a modified point frame method to document vegetation change in response to climate change and experimental warming. To save, time only the uppermost and lowermost encounter (TB method) of a plant below each grid point is recorded as opposed to all contacts (AC method). Here, we investigate the ability of this shortcut to accurately assess the community change and estimate the aboveground plant biomass at four long-term sites in northern Alaska. We found that the TB method underrepresented the species cover (by omitting intermediate contacts) between 35 and 50 % of the taxa at a site; however, the magnitude was less than 2 % cover for all but 17 of the 109 taxa and site combinations, and despite the smaller number of contacts in the TB method, it was nearly equal in its ability to detect a change in cover in response to warming as the AC method (only 1 of the 109 cases showed differences in the significance of the response). Linear regressions showed the accuracy of the TB, and AC methods were also similar in estimating aboveground plant biomass (same cases were significant, and all but 2 were within r2 of 0.1). Thus, we conclude that TB method outlined in the ITEX manual is an efficient and accurate way of assessing vegetation changes in tundra plant communities.
机译：点框方法是植被监测的理想选择，因为随着时间的流逝，精确的位置可能会被精确地重新采样。许多研究人员，包括与国际苔原实验（ITEX）相关的研究人员，都使用了改进的点框架方法来记录植被对气候变化和实验变暖的响应。为了节省时间，与所有联系（AC方法）相比，仅记录每个网格点以下植物的最上层和最下层相遇（TB方法）的时间。在这里，我们研究了此捷径能够准确评估社区变化并估计阿拉斯加北部四个长期站点的地上植物生物量的能力。我们发现，结核病方法不足以表示某个地点的类群的35％至50％之间的物种覆盖率（通过省略中间接触）；但是，除了109种分类和位点组合中的17种之外，其余所有物种的覆盖率均不到2％，尽管TB方法中接触点的数量较少，但其检测覆盖率变化的能力几乎相等。以AC法加温（109例中只有1例显示反应的重要性存在差异）。线性回归表明TB的准确性，AC方法在估算地上植物生物量方面也相似（相同的情况很重要，除2之外的其他均在0.1的r2内）。因此，我们得出结论，ITEX手册中概述的TB方法是评估苔原植物群落中植被变化的有效且准确的方法。

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