Fine‐scale changes in vegetation composition in a boreal mire over 50 years

摘要: 1. In the face of a rapidly changing environment, long-term studies provide important insights into patterns vegetation and processes change, but are rare for many ecosystems. 2. We studied recent changes at fine scale in Sphagnum-dominated bog south Sweden by resurveying part 54 years after original phytosociological survey. used an indirect approach to identify composition relation environment because lack permanent sampling units. By applying weighted averaging technique, we calculated relative species optimum values different environmental gradients as represented indicator light, temperature, pH, moisture nutrients. 3. Species mire has changed significantly over past five decades, indicated significant frequencies optima examined. with lower light higher nutrients have become more frequent on mire. particular, trees dwarf shrubs increased frequency, whereas typical decreased (e. g. Trichophorum cespitosum (L.) Hartm.) or disappeared from study site Scheuchzeria palustris L.). 4. Synthesis. Composition is found be dynamic temporal spatial scales. Increased air temperature nutrient availability few decades may augmented productivity tree growth), resulting drier shadier conditions several species. This successfully demonstrated applicability detecting change scale. effective way using historic modern data sets detect through time.