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Methods of Soil Resampling to Monitor Changes in the Chemical Concentrations of Forest Soils
Published on: November 25, 2016
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Between-year weather differences and long-term environmental trends both contribute to observed vegetation changes in
László Erdős1,2,3, Gábor Ónodi1, Khanh Vu Ho4,5
1HUN-REN Centre for Ecological Research Institute of Ecology and Botany Vácrátót Hungary.
Ecology and Evolution
|September 3, 2024
Summary
Repeated vegetation surveys reveal grassland changes over 17 years. Climate warming impacts species composition and richness, with short-lived spring ephemerals masking some long-term trends.
Area of Science:
- Ecology
- Botany
- Environmental Science
Background:
- Repeated vegetation surveys are crucial for detecting fine-scale ecological responses to environmental shifts.
- Dry grasslands are sensitive ecosystems where changes in species composition and richness can indicate broader environmental alterations.
- Understanding the influence of short-term weather fluctuations versus long-term climatic trends on vegetation dynamics is essential.
Purpose of the Study:
- To investigate changes in species composition and richness in dry grasslands over 17 years.
- To correlate observed vegetation changes with environmental shifts, particularly temperature and precipitation.
- To assess the impact of spring ephemeral species on the detection of long-term vegetation and environmental trends.
Main Methods:
- Resurveying 95 vegetation plots in Hungary's Kiskunság Sand Ridge from 2005 to 2022.
- Utilizing Distance-based Redundancy Analysis (Db-RDA) to analyze compositional shifts.
- Assessing environmental changes using ecological and naturalness indicator values, and comparing species richness (all, native, non-native) with and without spring ephemerals.
Main Results:
- Significant temporal changes in species composition were detected, with increased mean temperature and decreased soil moisture indicator values.
- A decline in overall and native species richness was observed, alongside an increase in mean naturalness.
- Excluding spring ephemerals reduced the significance of moisture changes, species richness decline, and naturalness increase, but not the temperature trend.
Conclusions:
- Both short-term weather variations and long-term environmental trends influence vegetation changes in dry grasslands.
- Spring ephemeral species can obscure the detection of long-term ecological trends due to their sensitivity to annual weather patterns.
- Climate warming is a significant driver of observed changes in dry grassland vegetation composition.
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