North-east Scotland Research Articles

First delirium episode in Parkinson\u2019s disease and parkinsonism: incidence, predictors, and outcomes

To define the incidence, predictors and prognosis of the first hospital delirium episode in Parkinson’s disease (PD) and atypical parkinsonism (AP), we identified the first hospital episode of delirium after diagnosis in the Parkinsonism Incidence in North-East Scotland (PINE) study, a prospective community-based incidence cohort of parkinsonism, using chart-based criteria to define delirium. Of 296 patients (189=PD, 107=AP [dementia with Lewy bodies, progressive supranuclear palsy, multiple system atrophy, vascular parkinsonism]), 152 developed delirium (PD = 98, AP = 54). Incidence of first hospital delirium episode per 100 person years was 8.1 (95% confidence interval [CI] 6.6–9.9) in PD and 18.5 (95% CI 13.9–24.7) in AP. Independent predictors of delirium were atypical parkinsonism (Hazard ratio [HR] vs PD = 2.83 [95% CI 1.60–5.03], age in PD but not in AP (HR for 10-year increase 2.29 [95% CI 1.74–3.02]), baseline MMSE (HR = 0.94 [95% CI 0.89–0.99]), APOE ε4 in PD (HR 2.16 [95% CI 1.15–4.08]), and MAPT H1/H1 in PD (HR 2.08 [95% CI 1.08–4.00]). Hazards of dementia and death after delirium vs before delirium were increased (dementia: HR = 6.93 [95% CI 4.18–11.48] in parkinsonism; death: HR = 3.76 [95% CI 2.65–5.35] in PD, 1.59 [95% CI 1.04–2.42] in AP). Delirium is a common non-motor feature of PD and AP and is associated with increased hazards of dementia and mortality. Whether interventions for early identification and treatment improve outcomes requires investigation.

Metamorphism of the Buchan type-area, NE Scotland and its relation to the adjacent Barrovian domain

The metamorphism of the Buchan block in northeast Scotland, and its relation to the Barrovian domain to its west, have been reassessed from consideration of mineral assemblages, microstructures, phase equilibrium modelling and monazite U–Pb geochronology. Zones of increasing metamorphic grade surround a central low-grade domain (biotite zone) and define a northward-opening, U-shaped metamorphic map pattern. The eastern and southern parts of the Buchan domain show the classic Buchan-type prograde sequence of cordierite – andalusite – sillimanite – migmatite/gneiss, representing a metamorphic field gradient of gently increasing pressure between (2.5–3.0 kbar, c. 550°C) and (3.5–4.0 kbar, c. 750°C). A slightly lower pressure metamorphic field gradient (by less than c. 0.5 kbar) is interpreted for the northeastern Buchan domain. The west Buchan domain shows a prograde sequence of staurolite+andalusite – sillimanite – gneiss/migmatite, representing a metamorphic field gradient of higher pressure by c. 1 kbar or less than the classic sequence over a similar temperature range. Unique to the northwestern Buchan domain is a staurolite+cordierite+andalusite domain in which staurolite-bearing schists have been overprinted by cordierite + andalusite assemblages. Monazite U–Pb geochronology of schists and gneisses from the Buchan block, including the Cowhythe and Ellon gneisses, yields ages in the range 470 ± 5 Ma, supporting geological evidence that the gneisses are metamorphosed Dalradian strata rather than older basement gneisses. The metamorphic ages are similar to the ages of mafic igneous intrusions in the Buchan block, even though many of the exposed intrusions post-date the regional metamorphic zones. The Buchan metamorphic zones are truncated to the west by the Portsoy–Duchray Hill Lineament, a ductile shear zone that juxtaposes the Buchan rocks against higher pressure, lower temperature (kyanite-bearing) Barrovian schists to the west ( c . 5.5–7.0 kbar, c. 580–650 °C). A 2–15 km wide corridor of andalusite pseudomorphed by kyanite occurs between the Portsoy–Duchray Hill Lineament and the Keith shear zone to its west. Monazite geochronology of the Barrovian rocks west of Portsoy shows little evidence of the c. 470 Ma signature of the Buchan block, instead yielding a dominant cluster of ages at c. 450 Ma and a more poorly defined grouping at c. 500 Ma. Supplementary materials: Analytical procedures; Thermodynamic modelling; Tables S1 to S13 (mineral assemblages, whole rock compositions, mineral compositions, isotopic analyses); Figures S1 to S5 (supplementary mineral assemblage map, graphs of mineral composition vs. grade, supplementary thermodynamically calculated phase diagrams, back-scattered electron (BSE) images of monazite grains, concordia diagrams for monazite U–Pb results) are available at https://doi.org/10.6084/m9.figshare.c.5536745

A criteria-driven approach to the CO2 storage site selection of East Mey for the acorn project in the North Sea

Carbon Capture and Storage (CCS) is an essential tool in the fight against climate change. Any prospective storage site must meet various criteria that ensure the effectiveness, safety and economic viability of the storage operations. Finding the most suitable site for the storage of the captured CO2 is an essential part of the CCS chain of activity. This work addresses the site selection of a second site for the Acorn CCS project, a project designed to develop a scalable, full-chain CCS project in the North Sea (offshore northeast Scotland). This secondary site has been designed to serve as a backup and upscaling option for the Acorn Site, and has to satisfy pivotal project requirements such as low cost and high storage potential. The methodology followed included the filtering of 113 input sites from the UK CO2Stored database, according to general and project-specific criteria in a multi-staged approach. This criteria-driven workflow allowed for an early filtering out of the less suitable sites, followed by a more comprehensive comparison and ranking of the 15 most suitable sites. A due diligence assessment was conducted of the top six shortlisted sites to produce detailed assessment of their storage properties and suitability, including new geological interpretation and capacity calculations for each site. With the new knowledge generated during this process, a critical comparison of the sites led to selection of East Mey as the most suitable site, due to its outstanding storage characteristics and long-lasting hydrocarbon-production history, that ensure excellent data availability to risk-assess storage structures. A workshop session was held to present methods and results to independent stakeholders; feedback informed the final selection criteria. This paper provides an example of a criteria-driven approach to site selection that can be applied elsewhere.

Reproductive Pattern of Parous Women and the Risk of Cancer in Later Life.

Simple SummaryThere is evidence to suggest that reproductive factors play an important role in women’s future cancer risk, particularly hormone-dependent malignancies such as breast cancer. However, some controversy remains regarding their effect on any cancer risk. This study aimed to assess the risk of any cancer in a nested case-control study of fertile women living in northeast Scotland in relation to: total number of pregnancies, cumulative time pregnant, age at first pregnancy and interpregnancy interval. Women who were older at first delivery had an increased risk of breast and gastrointestinal cancer, and a reduced risk of cancers of the respiratory tract and uterine cervix, including carcinoma in situ. These findings warrant the investigation of mechanisms underpinning these associations.We assessed the risk of any and site-specific cancers in a case-control study of parous women living in northeast Scotland in relation to: total number of pregnancies, cumulative time pregnant, age at first delivery and interpregnancy interval. We analysed 6430 women with cancer and 6430 age-matched controls. After adjustment for confounders, women with increasing number of pregnancies had similar odds of cancer diagnosis as women with only one pregnancy. The adjusted odds of cancer diagnosis were no higher in women with cumulative pregnancy time 50–150 weeks compared to those pregnant ≤ 50 weeks. Compared with women who had their first delivery at or before 20 years of age, the adjusted odds ratio (AOR) among those aged 21–25 years was 0.81, 95% CI 0.74, 0.88; 26–30 years AOR 0.77, 95% CI 0.69, 0.86; >30 years AOR 0.63, 95% CI 0.55, 0.73. After adjustment, the odds of having any cancer were higher in women who had an inter-pregnancy interval >3 years compared to those with no subsequent pregnancy (AOR 1.17, 95% CI 1.05, 1.30). Older age at first pregnancy was associated with increased risk of breast and gastrointestinal cancer, and reduced risk of invasive cervical, carcinoma in situ of the cervix and respiratory cancer.

Digital storytelling and participatory local heritage through the creation of an online moving image archive: a case-study of Fraserburgh on Film

PurposeThe aim of the research was to create a site which could host an archive of moving image associated with the town of Fraserburgh in Scotland, but could also include other digital artefacts to support and enhance the narratives contained within the films. Elements of digital storytelling were utilised, and a purposely designed section, “behind the film”, was included within the site which saw stories presented and supported with the use of archive newspaper clippings, photography and a series of reflective audio clips recorded for the research.Design/methodology/approach“Fraserburgh on Film” is an online platform created for the purpose of collating digital heritage film from the communities situated in the corner of North East Scotland. The research adopted an ethnographic approach working within the community, with James Taylor and other contributors to collect and curate moving images associated with the town. Archival research then supplemented these films. A digital platform was then constructed, tested and launched as the archival repository for the materials collected.FindingsThe research highlights the importance of having a close association with the community in question and provides details about the creation of the platform and framing it in the context of a vehicle for digital storytelling and participatory heritage. The article demonstrates how archive film should be gathered, edited and remastered for long-term preservation and access. Practical aspects such as video hosting, searchability, metadata are explored as are subsequent methods of dissemination and engagement.Practical implicationsThe research highlights a number of practical decisions which must be made when considering similar projects. These include gaining access to the moving images in the first place but also significant infrastructural issues around the creation, organisation and dissemination of an online digital repository. These lessons are transferable to other small community-based cultural and heritage organisations.Social implicationsThe archive has been very positively received in the community as an important repository for preserving community heritage and identity. High levels of public engagement have been demonstrated since its launch, which has led to new material being discovered. The archive has a wider cultural legacy across the North East of Scotland because of both the nature of the films and the widespread use of the Doric dialect.Originality/valueThe originality lies in the distinctive amount of moving image (and oral history) collected by local historian, James Taylor and his willingness to allow his materials to be edited and repurposed to ensure their long-term survival. The lessons learnt in this project are transferable to other locations in terms of both collecting material, the creation of the hosting platform and in crowdsourcing background information. The crucial importance of working with community partners in digital heritage work is reinforced. The research affords practical illustrations of steps to be taken and factors to be considered. It demonstrates how a well-crafted digital heritage product can genuinely engage with the community.

The Fishermen’s Luck: The Maritime Clavie and Its Variants

The Burning of the Clavie is a calendar custom traditionally associated with the ancient Pictish seaport of Burghead, but fishermen in north-east Scotland had their own ‘needfire’ version of the Clavie, used to instantly remedy spells of poor catches believed to have been caused by evil spirits, witches, or other forms of ill-luck. This article aims to delineate the maritime or fishermen’s Clavie as a reactive ritual rather than a calendar custom. The Clavie will be compared against other beliefs held and rituals re-enacted by the fishing communities, demonstrating that the fishermen had a specific set of ‘crisis’ rituals thought to rid them of ill-luck at sea. This article also offers, by its use of oral reminiscence, a snapshot of the contemporary belief concerning the Clavie found in mid twentieth- to early twenty-first-century fishermen in north-east Scotland and Shetland.

The Fedderate Charter and its implications for the thirteenth-century social and economic landscapes of North-east Scotland

ABSTRACT The late twelfth–early thirteenth-century Fedderate Charter gives a unique view of aspects of the thirteenth-century landscape of North-east Scotland that is not available from other sources. It is a multi-purpose document shedding light on agricultural, economic and social change, landscape and place-name development, secular religious observance and routeways. The method employed to describe the boundary of the estate is also unusual and may relate to the size of the grant and customary methods of witnessing such events.

The aftereffects of the UK national lockdown – could the reduction in urgent referrals, diagnostic and surgical capacities result in increased cancer morbidity and mortality?

Background: The COVID-19 pandemic has cause major disruption to daily life in the United Kingdom in 2020. The national lockdown and mobilization of healthcare resources to areas with increased demand has resulted in a historical shift in referral, diagnostic and surgical capabilities in most healthboards. This regional, retrospective study aimed to shed light on the potential consequences of the UK national lockdown, the resultant decrease in referrals and diagnostic capacity on surgical services and patients during the recovery phase. Methods: Urgent referrals for suspected (USC) prostate cancer ( N =1430) from primary care in the north-east of Scotland and the number of diagnostic prostate biopsies performed in the region were reviewed to assess trends between January 2018 and December 2020. The data was anonymized and charted to highlight the differences between the period of national lockdown and other times. Results: The number of USC referrals for prostate cancer dropped significantly between March 2020 and June 2020 (a mean of 25 per month from 45 per month in the same period in 2018 and 2019). The number of diagnostic procedures also decreased significantly, with 74 fewer biopsies having been performed during the lockdown period compared with the same period in 2019. Conclusions: The shifts in USC referrals and diagnostics during the lockdown period have led to a backlog which may put patients at risk of cancer stage migration, leading to increased morbidity and mortality. This study indicates that reestablishment of surgical services should take priority during the recovery phase. Level of evidence: 3

Who was Ever 'a Fisherman'? Revisiting Paul Thompson's Living the Fishing.

This article revisits Paul Thompson's major oral history project of Britain's early twentieth-century fishing industry, situating it within the emergence of oral history as a practice in the 1960s and 1970s, and interrogating assumptions over the fixed category of 'fisherman' which informed the original research. Through a detailed look at interviews collected with those involved in the herring fishing of East Anglia and north-east Scotland, it finds that Thompson and his colleagues were still as informed by social science interviewing practices as they were oral history as an evolving methodology, and framed their approach at a time when fixed worker identities were taken as given. Revisiting the transcripts with a different set of research questions revealed how 'fishermen' moved in and out of fishing, with 'farmworkers' equally being found as regularly employed on boats. Thus the article argues that instead of fixed and life-long fisher identities, precarity, migration and seasonality were key features of many fishers' involvement in the herring industry. Through focussing on mobility - across place and types of employment - this piece also reveals the central role of personal preference and intimate decision-making in mediating individuals' choices to 'follow the herring'.

Beyond Brexit – Is the UK’s Fixed Quota Allocation (FQA) system in need of a fix?

This paper presents the results of interviews conducted with stakeholders in the North East Scotland commercial fishing industry who operate with Fixed Quota Allocation (FQA) units under the United Kingdom’s (UK’s) fisheries management system. The results derived from these interviews provide a view of the FQA system from those operating within it and identify strengths and weaknesses of the system. The implications of these results are that the FQA system, and the introduction of FQA units, led to increased investment and efficiency within the North East Scotland ‘over 10 m′ sector. This, however, has led to a consolidation of quota and the raising of barriers to entry. These may threaten the future of the industry and its traditional links to its coastal communities but the situation is complicated by concerns that any changes to the system to address these threats risks destabilising the economic structure of the industry which is built on the asset value of FQA units. The UK Government has indicated that the system will endure post-Brexit so it may be that any additional quota realised from exiting the European Union (EU) is applied to a system where those who will benefit most understand that it may risk the industry’s future. This paper calls for more research into the FQA system, with those who work with FQA units and those who do not, to ensure that the socioeconomic impacts of this system are better understood in order that future management safeguards the stability of the industry into the future.

James Alexander May Findlay

James Alexander May Findlay, known to friends and family as Alastair, was born in the family home in Fraserburgh, a fishing town in the north east of Scotland. He was...

Is place or person more important in determining higher rural cancer mortality? A data-linkage study to compare individual versus area-based measures of deprivation.

Data from Northeast Scotland for 11,803 cancer patients (diagnosed 2007-13) were linked to UK Censuses to explore relationships between hospital travel-time, timely-treatment and one-year-mortality, adjusting for both area and individual-level socioeconomic status (SES). Adjusting for area-based SES, those living >60 minutes from hospital received timely-treatment more often than those living <15 minutes. Substituting individual-level SES changed little. Adjusting for area-based SES those living >60 minutes from hospital died within one year more often than those living <15 minutes. Again, substituting individual-level SES changed little. In Northeast Scotland distance to services, rather than individual SES, likely explains poorer rural cancer survival.Background and objectiveThe Northeast and Aberdeen Scottish Cancer and Residence (NASCAR) study found rural-dwellers are treated quicker but more likely to die within a year of a cancer diagnosis. A potential confounder of the relationship between geography and cancer mortality is socioeconomic status (SES). We linked the original NASCAR cohort to the UK Censuses of 2001 and 2011, at an individual level, to explore the relationship between travel time to key healthcare facilities, timely cancer treatment and one-year mortality adjusting for both area and individual-level markers of socioeconomic status.MethodsA data linkage study of 11803 patients examined the association between travel times, timely treatment and one-year mortality with adjustment for area, and for individual-level, markers of socioeconomic status.ResultsFollowing adjustment for area-based SES measures those living more than 60 minutes from the cancer treatment centre were significantly more likely to be treated within 62 days of GP referral than those living within 15 minutes (Odds Ratio [OR]) 1.41; 95% (Confidence Interval [CI]) 1.23, 1.60]. Replacing area-based with individual-level SES measures from UK Censuses made little impact on the results [OR 1.39; 95% CI 1.22, 1.57].Following adjustment for area-based SES measures of socioeconomic status those living more than 60 minutes from the cancer treatment centre were significantly more likely to die within one year than those living closer by [OR 1.22; 95% CI 1.08, 1.38]. Again, replacing area-based with individual-level SES measures from UK Censuses made little impact on the result [OR 1.20; CI 1.06, 1.35].ConclusionsDistribution of individual measures of socioeconomic status did not differ significantly between rural and urban cancer patients. The relationship between distance to service, timely treatment and one-year survival were the same adjusting for both area-based and individual SES. Overall, it seems that distance to services, rather than personal characteristics, influences poorer rural cancer survival.

Natural Children, Country Wives, and Country Girls in Nineteenth-Century India and Northeast Scotland

This article takes a history of emotions approach to Scottish illegitimacy in the context of imperial sojourning in the early nineteenth century. Using the archives of a lower-gentry family from Northeast Scotland, it examines the ways in which emotional regimes of the East India Company and Aberdeenshire gentry intersected with the sexual and domestic lives of native Indian women, Scottish farm servant women, and young Scottish bachelors in India. Children of these relationships, White and mixed-race, were the focus of these emotional regimes. The article shows that emotional regimes connected to illegitimacy are a way of looking at the Scottish history of empire.

Market buoyancy, information transparency and pricing strategy in the Scottish housing market

In housing markets there is a trade-off between selling time and selling price, with pricing strategy being the balancing act between the two. Motivated by the Home Report scheme in Scotland, this paper investigates the role of information symmetry played in such a trade-off. Empirically, this study tests if sellers’ pricing strategy changes when more information becomes available and whether this, in turn, affects the trade-off between the selling price and selling time. Using housing transaction data of North-East Scotland between 1998Q2 and 2018Q2, the findings show that asking price has converged to the predicted price of the property since the introduction of the Home Report. While information transparency reduces the effect of ‘overpricing’ on selling time, there is little evidence to show that it reduces the impact of pricing strategy on the final selling price in the sealed-bid context.

Settlement, landscape and land-use change at a Pictish Elite Centre: Assessing the palaeoecological record for economic continuity and social change at Rhynie in NE Scotland

The first millennium AD was a transformative period when many of the medieval kingdoms of Europe began to take shape, but despite recent advances in palaeoecological and archaeological research there remains a shortage of interdisciplinary collaborative research targeting this period. For some regions we know relatively little about the societies who lived during this formative period. This current investigation focusses on an early medieval elite centre near to Rhynie in NE Scotland; an important power-centre during the fourth–seventh centuries AD as evidenced by a remarkable series of Class I Pictish symbol stones, fortified enclosures at Cairn more, Tap o’ Noth and the Craw-Stane, as well as high status metal-working and a range of continental imports from the Craw-Stane enclosure. However, by the end of the seventh century AD, elite focus appears to have shifted elsewhere with the Craw-Stane and Cairn More enclosures all being abandoned. By combining paleoenvironmental analysis with available historical and archaeological archives this paper provides new insights into societal change during the first Millennium AD, with focus on the economic, social and environmental impacts caused by the rise and subsequent abandonment of elite nodes of power. A calibrated age of AD 260–415, near the base of the core, coincides with the earliest dates for the Craw-Stane complex and pre-dates the construction of the nearby Cairn More enclosure. The results provide a rare snapshot of the Late Roman Iron Age to Medieval environment of Northeast Scotland. This centre appears to have been supported by a rich agricultural landscape, with evidence of pastoral and arable farming, and potential metal working. One of the most significant findings of this study has revealed that despite abandonment of these elite enclosed sites by the seventh century AD, people continued to utilise the surrounding landscape and available resources right through until modern times.

Embankment lowering and natural self-recovery improves river-floodplain hydro-geomorphic connectivity of a gravel bed river

Floodplain reconnection can potentially improve the hydrogeomorphology of river corridors and attenuate flood peaks. However, empirical evidence of its effectiveness – needed to inform future restoration – is limited. A 70 m long flood embankment was lowered on the upper River Dee, a medium sized gravel bed river in north-east Scotland to reconnect a backwater and floodplain. Comparison of two years pre- and three years of post-restoration hydro-geomorphic monitoring, shows the lowering and subsequent adjustment, assisted by several floods including a <1% annual exceedance probability event, have altered the morphology and hydrological dynamics. Channel aggradation of up to 1 m occurred. Erosion of the bank by up to 0.41 m in depth and deposition of gravel or sand within the backwater and the floodplain were the dominant geomorphic responses elsewhere. The channel adjustment, unexpected in the restoration design, improved hydrological connectivity with the floodplain; annual median water table levels were on average 0.037–0.089 m higher post-restoration although the correlation between river discharge and floodplain water levels did not change. Based on 1D modelling, the threshold river discharge for backwater connection decreased by 55% from 93 m3 s−1 (discharge exceedance percentile: Q0.4) to 42 m3 s−1 (Q8). Thus, overspill frequency increased. For a given peak discharge, floodplain water levels were higher on average by 0.25 m with a statistically significant difference (Mann Whitney U test: p < 0.05), due to improved hydrological connectivity. The monitoring demonstrates that localised but significant improvement of channel to floodplain hydro-geomorphic connectivity can result from targeted embankment lowering. Such actions could enhance future catchment resilience by improving water storage and biogeochemical processing.

Catharine Trotter Cockburn on the virtue of atheists

ABSTRACT In her Remarks Upon Some Writers (1743), Catharine Trotter Cockburn takes a seemingly radical stance by asserting that it is possible for atheists to be virtuous. In this paper, I examine whether or not Cockburn’s views concerning atheism commit her to a naturalistic ethics and a so-called radical enlightenment position on the independence of morality and religion. First, I examine her response to William Warburton’s critique of Pierre Bayle’s arguments concerning the possibility of a society of virtuous atheists. I argue that this response shows Cockburn vacillating between a moral naturalism, on the one hand, and a theistic morality, on the other. Second, I draw on Cockburn’s letters to her niece, Ann Arbuthnot, and her opinions concerning mystical ideas about “the will of God” in north-east Scotland in the mid-eighteenth century. I maintain that these letters give us a fuller appreciation of Cockburn’s naturalistic position. My conclusion is that Cockburn’s ideas concerning atheism prompt us to consider the close interplay between secular and religious principles in so-called radical ideas of the period.

New dates for enclosed sites in north-east Scotland

This article presents the results of a programme of investigation into the enclosed settlements/forts and promontory forts of north-east Scotland, undertaken as part of the Northern Picts project. Reconnaissance excavations are reported on for nine sites: Crathie Point and Durn Hill, northern Aberdeenshire (Banffshire); Barmkyn of North Keig, Hill of Keir, Hill of Christ’s Kirk and Cnoc Cailliche (Wheedlemont), central Aberdeenshire; and Doune of Relugas, Knock of Alves and Wester Tulloch, Moray. Targeted excavation was undertaken at all examples and in the majority of cases produced a basic chronology for key phases of occupation/enclosure at the sites in question. Thirty-two new radiocarbon dates are presented, with a number of sites producing Iron Age dates, but a smaller number also revealing early medieval phases of occupation and use.&#x0D; Canmore ID 17947&#x0D; Canmore ID 17973&#x0D; Canmore ID 17701&#x0D; Canmore ID 19341&#x0D; Canmore ID 18141&#x0D; Canmore ID 17215&#x0D; Canmore ID 15755&#x0D; Canmore ID 16214&#x0D; Canmore ID 15766

Old Kinord, Aberdeenshire

The paper reports on research at two well-preserved Iron Age settlement sites in north-east Scotland, occupied between the 2nd century BC and 2nd century AD. At Old Kinord, trenches first excavated in 1903 were reopened, shedding new light on the chronology and structural history of a pair of stone roundhouses and two souterrains. The project extended to new surveys of this site and its neighbour at New Kinord. It investigated the character of the unusually large stone structures found there and the ways in which they were built and used. This report also considers the character of the original excavation, which was conducted by the future Lord Abercromby, a significant figure in the history of Scottish archaeology.&#x0D; &#x0D; Canmore ID 17072&#x0D; Canmore ID 17065&#x0D; Canmore ID 33981&#x0D; Canmore ID 16972&#x0D; Canmore ID 17057&#x0D; Canmore ID 33980

The Effect of Willow (Salix sp.) on Soil Moisture and Matric Suction at a Slope Scale

The aim of this study is to provide new knowledge on the effect of willow on hillslope hydrology at a slope scale. Soil moisture and matric suction were monitored in situ under willow-vegetated and fallow ground covers on a small-scale hillslope in Northeast Scotland for 21 months. The retrieved time series were analysed statistically to evaluate whether the dynamics of soil moisture and matric suction changed with the hillslope zone (i.e., toe, middle, and crest) under the two ground covers. The effect of air temperature and rainfall on the dynamics of soil moisture and matric suction, as well as the relationship between the two soil-water variables, under both ground covers, were also investigated by analysing the cross-correlation between time series. The results of 21 months of monitoring showed that willow contributed substantially to reduce soil moisture and to increase matric suction with respect to fallow soil. Additionally, willow-vegetated soil exhibited higher water retention and moisture buffering capacity than fallow soil. The effect of willow was highest at the hillslope toe due to a denser vegetation cover present within this zone. Both air temperature and rainfall had a strong effect on soil moisture and matric suction. However, the effect of air temperature was more consistent and easier to interpret than that of rainfall. Soil moisture and matric suction were shown to have a complex relationship and the soil water characteristic curve for vegetated soil requires further research. This study provides novel, field-based information supporting the positive effect of willow on hillslope hydrology. The results gathered herein will undoubtedly enhance the confidence of using woody vegetation in Nature-based Solutions (NBS) against geo-climatic hazards.