Woodland Clearance Research Articles

Late Holocene vegetation dynamics: degree and regional patterns of the Dark Ages woodland regeneration (ad 300–700) in the Netherlands

AbstractDuring the Dark Ages, which include the Late Roman period (ad 270–450) and the Early Middle Ages (ad 450–1050), large-scale vegetation development in northwest Europe was characterised by widespread regeneration of woodlands. This regeneration phase represents a break from the extensive reduction in woodland from human activities in late Holocene vegetation history. In the Netherlands, possible causes for this reversal can be found in a decreased human impact on the landscape, a colder and possibly wetter climate, and geomorphological changes. This paper presents a synthesis from 38 pollen records from a range of sites across the Netherlands, from which regional differences in the degree of woodland regeneration and vegetation composition before and during the Dark Ages have been identified. Both original data as well as vegetation abundance modelled by REVEALS were used to assess the regrowth of the woodland cover. The observed trends were considered in terms of the landscape setting and population estimates in order to disentangle the relative importance of these forcing factors. The results indicate that landscape and human impact were the most important factors determining the vegetation structure and changes to it. The pollen data show that in the Netherlands, the clearance of woodland in the Roman period followed by its regrowth afterwards were greatest in the river area. This can be linked to a high population density there during the Roman period followed by a strong decrease of population in the Dark Ages and to increased flooding.

From Ponds to Pine Plantations in 9000 Years: The Environmental Archaeology of Beck Burn, Solway Moss, Cumbria

ABSTRACT This article explores the evidence for environmental change at Beck Burn, Solway Moss, on the English/Scottish border. The analysed pollen, non-pollen palynomorphs (NPP) and microscopic charcoal particles permit several palaeoenvironmental events to be interpreted, supported by radiocarbon dating. These and previously published data suggest the presence of very early Mesolithic water-edge activity, later Mesolithic woodland management, clearance and small-scale cultivation during the early Neolithic period, followed by low-level disturbance for pastoral farming in the early Bronze Age. Woodland clearance and cereal cultivation are dated to the middle Bronze Age, with significant clearance and cultivation identified during the late Iron Age or early Roman period. The medieval period is characterised by evidence for a mixed subsistence economy, with reduced activity possibly coincident with the Wars of Scottish Independence, famines and the Black Death of the fourteenth century, as well as the Little Ice Age. Renewed activity, with evidence for both arable and pastoral farming, is dated to the late medieval to early post-medieval period. Pine plantations were then created, possibly in the eighteenth century or later. The data reveal the importance of palaeoenvironmental archaeology, in the absence of significant finds or features, in creating a link with the past.

Multi-proxy evidence for woodland clearance in northeast Northumberland (England) during the Iron Age

Pollen diagrams covering the Bronze Age to Roman period from northeast Northumberland are scarce. We present a 14C-dated pollen record from a peat-filled forest hollow in Chillingham Wild Cattle Park, northeast Northumberland, that spans the Iron Age. For the first time for this part of Northumberland, fungal spores are also analysed to investigate whether clearances took place in the context of crop cultivation or pastoralism. The pollen diagram shows significant woodland cover during the Late Bronze Age, with small-scale landscape openness potentially representing crop cultivation and animal grazing under a tree canopy. A local clearance event, with arboreal pollen falling to 13.2%, is radiocarbon dated to the late Early to Middle Iron Age, likely coinciding with the construction and occupancy of the nearby Ros Castle hillfort. A significant rise in dung fungal spores and the presence of Plantago and other open vegetation taxa indicate animal husbandry played an important role in this clearance phase. A subsequent large decrease in dung fungi and a small rise in arboreal pollen may reflect a degree of abandonment of the area after the climate cooled. Peat formation ceased in the late Middle to Late Iron Age as the hollow filled up. Limited renewed peat growth occurred in the last century or so, after peat shrinkage due to drying and consequent oxidation provided the possibility for renewed peat formation within the hollow.

Predicting the current and future distribution of pine woodland specialist plants in the Cairngorms National Park

The Caledonian pine forests of Scotland have declined significantly over the past century largely due to clearance for timber, fuel and grazing land. Approximately 1% of these native pinewoods remain from their historic extent, with a stronghold in the Cairngorms National Park. Creeping Lady’s-Tresses Goodyera repens (L.) R. Br., One-Flowered Wintergreen Moneses uniflora (L.) A. Gray and Twinflower Linnaea borealis L. favour this habitat, meaning that the clearance of pine woodland has resulted in widespread declines. There are multiple plantation schemes underway in the Cairngorms to reforest the Highlands, such as Cairngorms Connect, partly with the intent of assisting the recovery of pine woodland specialists. This study uses Maximum Entropy modelling (MaxEnt) to create species distribution models (SDMs), firstly to predict the current distribution for these species; thus, enabling land managers in the Cairngorms to target surveys with the hope of finding new populations. Secondly, future distribution models are created using different emissions scenarios to predict the regions of maximum habitat suitability for the study species, with the aim of visualising where pine woodland should be planted to ensure long-term habitat viability. The results showed that there are regions in the north and east of the Cairngorms which have the highest habitat suitability, currently and in the future. The creation of habitat corridors between these two regions should be a priority to prevent isolation between populations of pine woodland specialists. The high emissions pathway could increase the likelihood of isolation by significantly decreasing the habitat suitability between the most suitable areas.

Disentangling Holocene Climate Change and Human Impact from Palaeoenvironmental Records from the Scottish West Coast

Phases of rapid climate change throughout the early to mid Holocene coincide with regional human population expansion in Scotland and North-West Europe. Palaeoenvironmental signals of climate and anthropogenically driven vegetation changes can therefore be difficult to separate. To identify whether it is possible to distinguish potential signatures of anthropogenic clearance and agricultural activities from climatic drivers of landscape change in the early to mid Holocene in the region, two topographically contrasting sites on the Isle of Skye and the Isle of Bute were investigated. A multiproxy approach including pollen, spore, microcharcoal, loss on ignition and particle size analyses was adopted to investigate changes in vegetation and climate. There are subtle indications that the 8200 cal BP climate event had an effect on the vegetation composition at both sites. Signals of anthropogenic woodland clearance are apparent early in the sequence at Peat Hill (Bute), indicated by a peak in Poaceae (grass) cereal-type (7–14%) at 8592–8793 cal BP, alongside a decrease in arboreal pollen, which could not be associated with a regional episode of climate change. Early to mid Holocene vegetation changes at Lyndale House (Skye) occur alongside regional changes in precipitation and sea level and therefore cannot be readily separated. Continuous declines in arboreal pollen from ca. 5000 cal BP at Lyndale House indicates the onset of widespread clearance on Skye via felling and sustained grazing pressures.

The Utilisation of Native Woodland in Norse Greenland

ABSTRACT Wood was a key raw material for past societies and no less so in the Arctic region where woodland is sparse. When Norse settlers came to Greenland in the late tenth century AD, the pristine environment had not been affected by other humans for centuries. It has been assumed that the Norse had a negative effect on the environment, with drastic woodland clearance resulting in a more or less treeless landscape, contributing to the eventual demise of the Norse Greenlandic society. Recent palynological studies indicate that the environmental impact was in fact more complex. Wood taxonomic analyses on artefacts and samples from five Norse Greenlandic sites (1000–1400 AD) show that 36% of the combined assemblages (total of 8552 pieces) derive from native woodland. Mostly, it was used to make small-sized objects, but it was also an important source of nutrients, fuel, fodder and insulation. The proportion of native woodland was significantly higher on medium-sized farms than at the one high-status farm studied, indicating that socioeconomic factors impacted wood acquisition. Although local woodlands could not sustain all the timber needs of the Norse Greenlanders, it made up a substantial component of their wood procurement strategies.

The Oil BeetleMeloe rugosusMarsham, 1802 (Coleoptera, Meloidae) at Mill Bank, Penallt, Monmouthshire, Wales

Monitoring and marking schemes for the Oil BeetleMeloe rugosusMarsham, 1802 at Mill Bank, Penallt, Monmouthshire, confirm that the population is internationally significant, may exceed 300 individuals and benefits from traditional land management. The population is associated with a range of mining bee genera and is spatially constrained by aspect and conferred microclimatic effects. Beetles emerge in waves directly correlated with air and soil temperature and individual beetles may survive for months with a theoretical ability to produce astonishing numbers of eggs. Triungulins appear from at least April to June inclusive and have an affinity with flowers of dandelionTaraxacum sensu lato. The population is believed to have been favoured by medieval to early post-medieval woodland clearance episodes.

A multi-proxy Holocene palaeoenvironmental record of climate change and prehistoric human activity from Lough Cullin, southeast Ireland

A multiproxy (pollen, microcharcoal, loss-on-ignition, magnetic susceptibility and geochemistry) sequence from Lough Cullin, southeast Ireland, supported by a high-resolution radiocarbon chronology, modelled using Bayesian approaches, provides a record of environmental change for much of the Holocene. Following the establishment of mixed deciduous woodland, climatic deterioration was likely responsible for pronounced vegetation change and erosion, 7615–6500 cal. BC to 6245–5575 cal. BC, evidence for the ‘8.2 Kyr’ BP climate event. The so-called ‘elm decline’ is dated to 4220–3980 cal. BC and whilst there are possible indications of an anthropogenic cause, clear evidence of woodland clearance with cereal pollen is recorded at 3900–3700 cal. BC, 3790–3580 cal. BC and 3760–3650 cal. BC, during a period of clearance and farming of 320–450 years duration. A reduction in farming/settlement and woodland regeneration during the Middle Neolithic parallels the archaeological record, with low levels of activity during the Late Neolithic/Chalcolithic after 2960–2525 cal. BC, prior to increases during the Bronze Age then woodland clearance and agriculture between 1500–1410 and 1275–1000 cal. BC, corresponding with the archaeological evidence. A subsequent ‘step-wise’ reduction in human activity follows, from the latter date to 815–685 cal. BC, and a brief but pronounced cessation at 690–535 cal. BC. Renewed woodland clearance and agriculture commenced until 415–250 cal. BC. From the latter date until cal. AD 390–540, the Late Iron Age/Early Medieval period, a phase of woodland recovery is attested, followed by renewed landscape disturbance and arable agriculture in particular, continuing to the close of the record at cal. AD 780–1035.

Landnám, Land Use and Landscape Change at Kagaðarhóll in Northwest Iceland

ABSTRACT Palaeoecological studies from across Iceland, in tandem with historical and archaeological examinations, have helped improve our understanding of patterns and processes involved in the initial settlement of Iceland. Here, we present a new high resolution reconstruction of vegetation and landscape dynamics for the farm Kagaðarhóll, a lowland site in Austur-Húnavatnssýsla, Northwest Iceland, a region with a notable scarcity of known archaeological sites. Through palynology and the analysis of lithological proxies, the study locates and examines human influence at the study site and evaluates the mechanisms of environmental change. Prior to settlement, following long-term vegetation regression, Betula woodland interspersed with sedge bog was prevalent at Kagaðarhóll. Woodland clearance and grazing was initiated no later than AD 900, illustrating the arrival of humans. Over the following centuries, the record shows continued grazing, increased soil erosion and a transition into heathland and shrubland indicative of anthropogenic environmental degradation. Woodland conservation and management practices are also inferred. The study is important in extending knowledge of Icelandic environmental change and anthropogenic activity where archaeological research is scant and in bringing together regional patterns of settlement in order to understand wider settlement processes.

Recession or Resilience: Evidence for Neolithic Agriculture in Updated Palaeoenvironmental Reconstructions from Lairg, Sutherland

ABSTRACT A consistent theme in British prehistoric studies is a perceived lack of evidence for settlement and agriculture in the Neolithic (c.4000 cal BC – 2500 cal BC), which then increases in prevalence during the Bronze Age. This lack of evidence for Neolithic settlement and farming has been linked to a collapse of agriculture associated with population decline and climatic deterioration from c.3600 cal BC onwards, with population recovery and the resumption of widespread agriculture in the later 3rd millennium cal BC. Updated palaeoenvironmental reconstructions from Lairg, Sutherland, incorporating a high-resolution Bayesian chronology based on 14C dates from 20 samples indicate that mixed agriculture (including cereal cultivation) continued in this area during the proposed Middle – Late Neolithic agricultural recession described above. We suggest that an existing reliance on barley, which is more tolerant of cooler, wetter conditions than other cereals, and the use of well-drained sites within the landscape allowed cereal cultivation to continue in the face of climatic deterioration. We also suggest that a lack of high-resolution chronologies for palaeoenvironmental reconstructions and a reliance on woodland clearance as a proxy for agriculture could potentially obscure pollen evidence for Middle and Late Neolithic farming. Issues of chronological precision in legacy datasets are addressed.

Roman Frontiers and Landscapes of Occupation: Road Building and Landscape Change in the Hadrianic-Antonine Frontier Zone

ABSTRACT Dere Street is the Roman road which ran north from Eboracum (York), crossing the Stanegate at Corbridge and continuing into what is now Scotland. The road served a military and economic purpose facilitating the transport of troops and trade north and south across the frontier zone. Here we present a well resolved palaeoenvironmental record within the Hadrianic-Antonine frontier zone that is tied directly to the archaeological evidence for Dere street. The evidence indicates limited woodland clearance during the Neolithic and Bronze Age followed by large scale woodland clearance at c. 890 BC, with woodland replaced by open grassland indicating that throughout the Iron Age land use was primarily pastoral. Dere Street was constructed in (AD 79–81) and when the Roman road builders arrived at Dun Law the landscape was largely open. Limited local timber resources meant that hazel scrub cover was probably used to construct the road with evidence to suggest that other timber resources were brought in from outside the site. The landscape at Dun Law was predominantly grazed during and post Roman occupation and there is some evidence for shifts in intensity of grazing from c. AD 950.

Microslag as a stratigraphic tracer to quantify floodplain processes (Lienne catchment, Belgium)

This paper focuses on two objectives: (i) the presentation of the methodology for using small-sized iron slag (called microslag) as a stratigraphic marker to reconstruct the centennial-scale floodplain evolution and (ii) the study of the geomorphic evolution of the Ardennian rivers situated in the Lienne catchment (southern Belgium) by means of microslag evaluation, 14C dating, topographic surveys and sedimentological analysis. Using these data, the floodplain history since the Late Pleistocene is reconstructed, fine floodplain sedimentation and lateral mobility rates are estimated, and channel incision phases are identified. The first Holocene erosion episode occurred during the Bronze Age. Archaeological data and historical sources indicate Roman and High Middle Age occupations in the area but no evidence of erosion or increased floodplain sedimentation have been observed. Several peat layers have been dated in the Chavanne floodplain to approximately 1000 BP and probably indicate very low anthropogenic activity and a high level of groundwater. Before 1000 CE, the fluvial style of the Ardennian rivers was probably different, characterized by a low-level forested floodplain, which explains the presence of frequent peat layers within the alluvial sequences and abandoned channels. From the eleventh century onwards, a generalized increase in sedimentation rates occurred, coinciding with a higher concentration of charcoal in the alluvium and also the formation of colluvial deposits. Analyses of slag concentrations allowed us to reconstruct the evolution of the floodplain topography. In the Lienne catchment, the mean floodplain aggradation over the last several centuries is between 2.7 and 16 cm/century, depending on the study site. Such differences in floodplain sedimentation rates can be explained by several factors such as the distance to past cultivation areas, the degree of woodland clearance, flow velocities during floods and the incision of the riverbed during recent centuries, which reduces the frequency of inundation and, therefore, sedimentation on floodplains.

Identifying Social Transformations and Crisis during the Pre-Monastic to Post-Viking era on Iona: New Insights from a Palynological and Palaeoentomological Perspective

ABSTRACT Iona is renowned for its early monastery, founded following the arrival of Columba in AD 563. This paper uses palaeoecological data to provide insight into the social and environmental transformations that influenced the landscape of Iona during the later prehistoric and historic periods. The identification of cereal pollen suggests that arable farming occurred during the Bronze Age and possibly continued through the Iron Age. Pastoral farming was also practiced. It remains unclear as to whether there were people living on the island at the time of the monastic community’s arrival. Between AD 630 and 1100, woodland clearance and farming occurred. There were also two phases of woodland regeneration and agricultural decline. The first phase coincides with the period of Viking raids and may have witnessed a decline in population. The second phase occurred in conjunction with increased Scandinavian influence and political restructuring across the wider region; however, small-scale farming continued. After c. AD 1000 there was renewed intensification of landscape management prior to the arrival of Benedictine monks and Augustinian nuns (c. AD 1200). This may be linked to climatic amelioration during the Medieval Warm Period and economic growth in the Hebrides.

Birds respond to woodland type, soil and mesic gradients in heterogeneous woodlands at Dryandra

The vast clearance of forest and woodland for agriculture with the removal of more than 93% of the native vegetation has decimated the fauna of what is now known as the Western Australian wheatbelt. This clearing has been particularly severe on wandoo woodlands through the wheatbelt. In order to quantify the usefulness of what has been left, three native woodland types were surveyed for avian abundance and diversity, in a large heterogeneous remnant of old-growth woodland, at Dryandra. Birds were counted at 70 points along seven transects, through three woodland types: powderbark wandoo (Eucalyptus accedens), wandoo (E. wandoo) and a brown mallet (E. astringens) plantation. Greater abundance and species richness were detected in E. wandoo woodland, although this is thought to be related to the more mesic and productive low-lying contours of the landscape on which it is situated.

Dark Ages woodland recovery and the expansion of beech: a study of land use changes and related woodland dynamics during the Roman to Medieval transition period in northern Belgium

AbstractThe results from analyses of botanical remains (pollen, wood, charcoal, seeds) from several archaeological features excavated in Kluizen (northern Belgium) are presented. The region was largely uninhabited until the Iron Age and Roman period when a rural settlement was established, resulting in small-scale woodland clearance. The site was subsequently abandoned fromc.AD 270 till the High Middle Ages. The results of the archaeological and archaeobotanical analyses provide information on changes in land use and resulting dynamics of woodland cover and composition betweenc.600 BC and AD 1200, with a spatial and temporal resolution unrivalled in northern Belgium. Especially the long period of woodland regeneration following abandonment of the site around AD 270, covering the Late Roman and Early Medieval period, could be reconstructed in detail. Abandoned fields were first covered with pioneer woodland (Salix,CorylusandBetula), thenQuercus-dominated secondary forest and finally a late-successional forest withFagus sylvatica,Carpinus betulusandIlex aquifolium, an evolution that took over 300 years. The results also indicate that the observed increase ofFagusduring the Early Middle Ages, which was never an important element in the woodland vegetation in northern Belgium before, was related to climatic changes rather than anthropogenic factors.

Opening the Woods: Towards a Quantification of Neolithic Clearance Around the Somerset Levels and Moors

Environmental reconstructions from pollen records collected within archaeological landscapes have traditionally taken a broadly narrative approach, with few attempts made at hypothesis testing or formal assessment of uncertainty. This disjuncture between the traditional interpretive approach to palynological data and the requirement for detailed, locally specific reconstructions of the landscapes in which people lived has arguably hindered closer integration of palaeoecological and archaeological datasets in recent decades. Here we implement a fundamentally different method for reconstructing past land cover from pollen records to the landscapes of and around the Somerset Levels and Moors—the Multiple Scenario Approach (MSA)—to reconstruct land cover for a series of 200-year timeslices covering the period 4200–2000 cal BC. Modelling of both archaeological and sediment chronologies enables the integration of reconstructed changes in land cover with archaeological evidence of contemporary Neolithic human activity. The MSA reconstructions are presented as a series of land cover maps and as graphs of quantitative measures of woodland clearance tracked over time. Our reconstructions provide a more nuanced understanding of the scale and timing of Neolithic clearance than has previously been available from narrative-based interpretations of pollen data. While the archaeological record tends to promote a view of long-term continuity in terms of the persistent building of wooden structures in the wetlands, our new interpretation of the palynological data contributes a more dynamic and varying narrative. Our case study demonstrates the potential for further integration of archaeological and palynological datasets, enabling us to get closer to the landscapes in which people lived.

Akinetes and ancient DNA reveal toxic cyanobacterial recurrences and their potential for resurrection in a 6700-year-old core from a eutrophic lake

In order to evaluate the recurrence of toxic cyanobacterial blooms and to determine the survival capabilities of the resistance cells through time, a sedimentary core spanning 6700 years was drilled in the eutrophic Lake Aydat. A multiproxy approach (density, magnetic susceptibility, XRF, pollen and non-pollen palynomorph analyses), was used initially to determine the sedimentation model and the land uses around the lake. Comparison with the akinete count revealed that Nostocales cyanobacteria have been present in Lake Aydat over a six thousand year period. This long-term cyanobacterial recurrence also highlights the past presence of both the anaC and mcyB genes, involved in anatoxin-a and microcystin biosynthesis, respectively, throughout the core. The first appearance of cyanobacteria seems to be linked to the natural damming of the river, while the large increase in akinete density around 1800 cal.yr BP can be correlated with the intensification of human activities (woodland clearance, crop planting, grazing, etc.) in the catchment area of the lake, and marks the beginning of a long period of eutrophication. This first investigation into the viability and germination potential of cyanobacteria over thousands of years reveals the ability of intact akinetes to undergo cell divisions even after 1800 years of sedimentation, which is 10 times longer than previously observed. This exceptional cellular resistance, coupled with the long-term eutrophic conditions of this lake, could partly explain the past and current recurrences of cyanobacterial proliferations.

The environmental impact of cultural change: Palynological and quantitative land cover reconstructions for the last two millennia in northern Poland

This paper presents the first quantitative past land cover reconstructions for northern Poland using the Landscape Reconstruction Algorithm (LRA), interpreted alongside traditional percentage pollen data and historical sources. These data are used to evaluate the impact of cultural change on past vegetation and land-use in northern Poland during the last 2000 years. Vegetation change and land-use are apparent corresponding to the late Roman Iron Age (1st to 3rd centuries), Migration Period (4th–7th centuries), early Medieval (8th to early-13th centuries) and late medieval (early-13th to mid-15th centuries). The Roman Iron Age is characterised by significant land cover estimates for meadowland, likely part of a broad spectrum agricultural strategy. Widespread depopulation and woodland regrowth characterise the Migration Period, followed by the progressive clearance of woodland from the 7th/8th centuries corresponding to Slavic colonisation. Polish control of the region from the mid-10th century is accompanied by intensification in agricultural land-use. However, archaeological evidence for increasing settlement instability during the 11th/12th centuries is not obviously apparent in the palynological data. This likely reflects the sporadic nature and uneven impact of conflict, but also the difficulty in resolving short-term events in the palynological record. Significant woodland clearance occurred prior to the crusades, with the consequence that there is no clearly identifiable horizon of significant landscape change associated with the arrival of the Teutonic Order. However, large tracts of woodland survived in sparsely populated frontier zones and in areas with poor agricultural soils, managed as part of an extensive provisioning network covering the Teutonic Order's state.

Tyrrhenian central Italy: Holocene population and landscape ecology

This paper compares changes in vegetation structure and composition (using synthetic fossil pollen data) with proxy data for population levels (including settlements and radiocarbon dates) over the course of the last 10 millennia in Tyrrhenian central Italy. These data show generalised patterns of clearance of woodland in response both to early agriculturalists and urbanism, as well as the specific adoption of tree crops and variations in stock grazing. The results provide a comprehensive understanding of the development of the anthropogenised landscape of one of the most important early centres of European civilisation, showing regional trends as well as local variations.

Palynology of Iron Age and Gallo-Roman archaeological sediments from Beaurieux Les Grèves, Aisne, France

Pollen and non-pollen palynomorph analyses conducted on archaeological sediments from ditches and pits are used to investigate land-use and vegetation history around the long-lived rural settlement of Beaurieux Les Greves in the Aisne valley, Picardy, northern France. Samples were examined from successive phases spanning the 8th century bc to the 3rd century ad. Each phase showed evidence of agriculture and human impact on the environment. The earliest occupation was during the early Iron Age, and the area around the site was shown to have been almost completely deforested and mainly pasture. The later Iron Age supported mixed agriculture, probably with pasture around the settlement site and cereal fields further away. In Gallo-Roman times there was mixed farming with considerable cereal cultivation, although the area near the site was mainly pasture or abandoned land. Late Gallo-Roman times saw a reduction in agricultural activity and some regeneration of heath and scrub vegetation. Coprophilous fungal spores are conspicuous and indicate the importance of animal husbandry on and around the site. The data from Beaurieux Les Greves augment earlier analyses from settlements and natural deposits in the Aisne valley in suggesting almost complete deforestation for agricultural land use within the valley bottom, although some woodland undoubtedly survived on the steeper valley sides and nearby plateaux. It agrees with the pollen evidence from the wider region of north-eastern France that shows clearance of Fagus-dominated woodland for mixed agriculture in late Iron Age and Gallo-Roman times, and increasingly for arable cultivation. This was responsible for effecting a transformation from a partly wooded to a mainly open landscape.