AIM Resurveys of historical vegetation plots are increasingly used for the assessment of decadal changes in plant species diversity and composition. However, historical plots are usually relocated only approximately. This potentially inflates temporal changes and undermines results. LOCATION Temperate deciduous forests in Central Europe. METHODS To explore if robust conclusions can be drawn from resurvey studies despite location uncertainty, we compared temporal changes in species richness, frequency, composition and compositional heterogeneity between exactly and approximately relocated plots. We hypothesized that compositional changes should be lower and changes in species richness should be less variable on exactly relocated plots, because pseudo-turnover inflates temporal changes on approximately relocated plots. RESULTS Temporal changes in species richness were not more variable and temporal changes in species composition and compositional heterogeneity were not higher on approximately relocated plots. Moreover, the frequency of individual species changed similarly on both plot types. MAIN CONCLUSIONS The resurvey of historical vegetation plots is robust to uncertainty in original plot location and, when done properly, provides reliable evidence of decadal changes in plant communities. This provides important background for other resurvey studies and opens up the possibility for large-scale assessments of plant community change.

中文翻译：

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植被重新调查对于地块位置的不确定性是稳健的

AIM 历史植被地块的再调查越来越多地用于评估植物物种多样性和组成的年代际变化。然而，历史地块通常只是大致地重新定位。这可能会夸大时间变化并破坏结果。位置 中欧的温带落叶林。方法 为了探索是否可以在位置不确定的情况下从再调查研究中得出可靠的结论，我们比较了精确和近似重新定位的地块之间物种丰富度、频率、组成和组成异质性的时间变化。我们假设成分变化应该较低，物种丰富度的变化应该在精确重新定位的地块上变化较小，因为伪营业额会夸大近似重新定位的地块上的时间变化。结果 在大约重新安置的地块上，物种丰富度的时间变化并没有更多的变化，物种组成和组成异质性的时间变化也没有更高。此外，两种地块类型上单个物种的频率变化相似。主要结 这为其他再调查研究提供了重要背景，并为大规模评估植物群落变化提供了可能性。两种地块类型上单个物种的频率变化相似。主要结 这为其他再调查研究提供了重要背景，并为大规模评估植物群落变化提供了可能性。两种地块类型上单个物种的频率变化相似。主要结 这为其他再调查研究提供了重要背景，并为大规模评估植物群落变化提供了可能性。