Abstract
AbstractThe most species-rich grasslands worldwide are known from the Carpathian Mts and their periphery in East-Central Europe. They occur in forest-steppe regions, transitional between temperate forest and arid steppe biomes. Their climate, largely suitable for forests, raises questions about the origin of these grasslands. Have they been forested in the past, or locally maintained through a disturbance regime? We addressed these questions to contribute to the broader understanding of Holocene dynamics of open habitats in temperate Europe. We employed soil charcoal analysis and soil morphology to reconstruct past representation of woody species with fine spatial resolution. Our study area was Romanian Transylvania, a region renowned for a well-developed forest-steppe. Six soil profiles along a climatic gradient were assessed: four in forest-steppe grasslands, two in grasslands in adjacent forest region. The results revealed profound differences between forest-steppe and forest grasslands. Forest-steppe profiles showed Phaeozems with low specific anthracomass and continuous dominance byJuniperus, suggesting a long-term presence of grasslands. Forest profiles showed Luvisols with higher anthracomass and abundant charcoal of broad-leaved trees, indicating establishment after deforestation. The high radiocarbon ages of charcoals in basal soil horizons point to a glacial origin of soils and the link of forest-steppe grasslands to glacial forests. Siberian hemiboreal forests and related grasslands may be modern analogues of the reconstructed ecosystems, sharing many species with present day forest-steppe. We highlight the role of disturbances such as fire, herbivore grazing, and human activities in shaping the forest-steppe over time, contributing to the formation of today’s richest grasslands.
Publisher
Cold Spring Harbor Laboratory
Reference90 articles.
1. Tree-pollen rain in a mixed deciduous forest in South Jutland (Denmark)
2. Bădărău AS (2005) Transformation of the landscapes within the Transylvanian Plain (Romania) with special focus upon the biogeographical aspects. PhD Thesis, Babeș-Bolyai University, RO.
3. Benkova VE and Schweingruber FH (2004) Anatomy of Russian woods. An atlas for the identification of trees, shrubs, dwarf shrubs and woody lianas from Russia. Bern: Haupt Verlag.
4. Contributions of Quaternary botany to modern ecology and biogeography;Plant Ecology & Diversity,2019
5. Benchmarking plant diversity of Palaearctic grasslands and other open habitats;Journal of Vegetation Science,2021