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- Norstedt, Gudrun, 1965-, et al.
(författare)
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Detecting Cultural Remains in Boreal Forests in Sweden Using Airborne Laser Scanning Data of Different Resolutions
- 2020
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Ingår i: Journal of field archaeology. - : Routledge. - 0093-4690 .- 2042-4582. ; 45:1, s. 16-28
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Tidskriftsartikel (refereegranskat)abstract
- Airborne laser scanning (ALS) is increasingly being used to detect cultural remains in forest landscapes. Boreal forests are challenging, however, since most ancient land use was carried out without major permanent ground disturbances. If this challenge can be met, there is a large potential for surveys through existing nation-wide laser-scanning programs, although their resolutions tend to be low. In this study, we compare the performance of low-resolution (LR) and high-resolution (HR) ALS data in the Krycklan catchment in northern Sweden, an area where ancient land use was small-scale and diverse. About three times as many cultural remains were detected in the HR data set, but the LR set was satisfactory for distinct structures. We analyze how LR data sets can be enhanced at ground-point classification and terrain-model generation and conclude that ALS data have a large potential for the detection and protection of cultural remains in the boreal forest.
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| 2. |
- Norstedt, Gudrun, 1965-, et al.
(författare)
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From Haymaking to Wood Production : Past Use of Mires in Northern Sweden Affect Current Ecosystem Services and Function
- 2021
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Ingår i: Rural Landscapes. - : Stockholm University Press. - 2002-0104. ; 8:1, s. 1-15
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Tidskriftsartikel (refereegranskat)abstract
- Mires form a large part of the boreal Swedish landscape and are important for biodiversity and natural ecosystem processes. Historically, mires also played a key role for the expansion of agricultural practices, and later to create new forest land, but knowledge is limited on how the land use has affected the current ecosystem services and functions of mires. In this case study from northern Sweden, we have combined historical maps with remote-sensing data to analyze the use of mires over time. Here, 22% of the mire area has been used for hay harvesting, an activity that peaked in the late 1800s. Later, about 3% was reclaimed for intensive agriculture. Drainage to enhance wood production followed in the 1940s, and about 40% of the original mire area is currently forested. The most productive mires have been relatively more affected by human measures. We suggest that this past land use has legacy effects on several ecosystem services. Haymaking likely had positive effects on biodiversity, but may have negatively influenced carbon sequestration. Reclamation led to habitat loss and likely less carbon sequestration. Drainage to promote forest growth generally lowered the ground water level, which in turn enhanced peat decomposition and subsequently released CO2. However, if tree growth outpaces peat decomposition, drainage could increase carbon sequestration. The overall carbon balance is hence influenced by past management regimes, which implies that past human use must be taken into account when considering the role of mires in providing ecosystem services.
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| 3. |
- Norstedt, Gudrun, 1965-, et al.
(författare)
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Krycklan : markanvändning från forntid till nutid
- 2019
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Bok (populärvet., debatt m.m.)abstract
- Kring vattendraget Krycklan i Vindelns kommun, Västerbottens län, finns en unik forskningsinfrastruktur, anlagd och underhållen av Sveriges Lantbruksuniversitet, SLU. Där kan hydrologiska, biogeokemiska och ekologiska processer studeras i ett sammanhang. Nutida förhållanden är emellertid alltid ett resultat av historiska skeenden. Utan att förstå historien kan det vara svårt att tolka nutiden. Under åren 2017–2019 har därför ett projekt bedrivits för att ta fram historiska fakta om markanvändningen inom Krycklans avrinningsområde. En mängd data har samlats in, varav en liten del presenteras i denna skrift.
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