Main Ecosystem Characteristics and Distribution of Wetlands in Boreal and Alpine Landscapes in Northern Sweden Under Climate Change
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Résumé
Wetlands and peatlands are integral parts of many of the world's biomes, forming important transition zones between upland and aquatic systems. These habitats have a high degree of complexity of hydrology, edaphic conditions, and vegetation composition, contributing to the biodiversity of landscapes and species richness. They act to influence and modify the movement of runoff and groundwater from uplands into streams and lakes, by laying down organic remains (peats), and absorbing and releasing elements, compounds, gases, and particulate and dissolved organic matter. They therefore act as hydrological water retainers and biological filters in the landscape. Many kinds of wetlands and peatlands can be found, each with a particular hydrology and surface form, moisture and chemical regime, and range of vegetation types and associated biota. Owing to their hydrological characteristics, predominantly peat soils and hydrophytic plants, wetlands and peatlands are key habitats to indicate climate change, particularly changes towards drying (e.g., decreased precipitation, increased runoff from melting glaciers and snow pack). Changes in moisture regime will effect changes in the processes of peat accumulation and decomposition, release of nutrients and dissolved organic matter, and vegetation and species. Drainage for agriculture and forestry, peat harvesting, and development have already caused considerable areas of peatlands to decrease in depth and area. Owing to drying, some peatlands adjacent to uplands have decreased in depth to less than 30 cm, the defined depth for peatlands in Sweden, and thus the total area of peatland has decreased. Drying also has caused changes in vegetation, for examples, advances of trees and shrubs from the margins into the centres of peatlands (e.g., Fig. 1; cf. Hebda et al., 2000; Hebda et al. estimated the zone of influence of water lowering in Burns Bog, a bog on the Fraser River Delta in southern British Columbia, Canada, to extend over 100 m from a peripheral ditch. The Swedish Wetland Inventory, VMI, Ecosystems Biodiversity 194 mires in the northern part of Sweden are strongly influenced or even destroyed, and 55% are weakly influenced while the rest are considered uninfluenced by human impact. Impacts are mainly from machines used for forestry and the digging of ditches. Small mires and mires in the Scandinavian Mountain Range were not covered by the VMI, however, and it may be assumed that processes such as increased tree cover or successional shifts to other vegetation types are more evident in such habitats. The main threats to the mountainous mires are tracks from all-terrain vehicles and snowmobiles, and much concern has been expressed from County Boards and the Swedish Environmental Protection Agency about this issue (e.g.
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| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
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