Recent landscape history from a Co. Down lake deposit

Area of Science:

• Palaeoecology
• Environmental History
• Archaeobotany

Background:

• Historical records suggest substantial woodland clearance in 17th-century Ireland.
• The timing of agricultural introductions, particularly cereal cultivation, is debated for regions with heavy soils.
• The persistence of certain plant taxa, like Elm (Ulmus), is often questioned in historical contexts.

Purpose of the Study:

• To reconstruct the long-term agricultural and environmental history of a lowland site in Co. Down, Northern Ireland.
• To investigate the timing of cereal cultivation and landscape changes over the last two millennia.
• To assess the historical accounts of woodland clearance and the persistence of Elm (Ulmus).

Main Methods:

• Analysis of a radiocarbon-dated pollen diagram from a lake deposit.
• Identification and quantification of fossil pollen to reconstruct past vegetation and land use.
• Correlation of palynological data with historical timelines.

Main Results:

• Continuous mixed agriculture was evident for approximately two thousand years.
• Cereal cultivation was introduced between the 3rd and 5th centuries A.D., earlier than typical for heavy soil sites in Ireland.
• No significant woodland clearance was detected in the 17th century; landscape enclosure by hedges began in the 18th century.
• Flax cultivation was a relatively recent introduction.
• Elm (Ulmus) pollen was consistently present from A.D. 600 to A.D. 1700, contradicting historical assumptions of its absence.

Conclusions:

• The pollen record provides a detailed history of land use, challenging some historical interpretations.
• Early cereal cultivation and the continuous presence of Elm (Ulmus) highlight the dynamic nature of past landscapes.
• Palynological data offers crucial insights into the timing and scale of human impact on the environment.