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| Riitters, Kurt; U.S. Forest Service; kriitters@fs.fed.us; Wickham, James; U.S. Environmental Protection Agency; wickham.james@epamail.epa.gov; Coulston, John; North Carolina State University; jcoulston@fs.fed.us. |
| The question of incorporating road maps into U.S. national assessments of forest fragmentation has been a contentious issue, but there has not been a comparative national analysis to inform the debate. Using data and indices from previous national assessments, we compared fragmentation as calculated from high-resolution land-cover maps alone (Method 1) and after superimposing detailed road maps (Method 2). There was more overall fragmentation with Method 2. However, because roads were often adjacent to other nonforest land cover, Method 1 typically detected > 80% of the forest edge and > 88% of the fragmentation of core, i.e., intact, forest that was detected by Method 2. Indices based on individual patch size changed much more for Method 2;... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: United States; Ecological assessments; Land-cover maps; Landscape patterns; Road maps; Forest fragmentation. |
| Ano: 2004 |
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| Mouillot, Florent; DREAM CEFE/CNRS, France;. |
| Human practices have had an impact on Mediterranean ecosystems for millennia, particularly through agricultural and pastoral activities. Since the mid-19th century, land-use abandonment has led to the expansion of shrubland and forest, especially in the mountainous areas of the northern Mediterranean basin. Knowledge of these factors is vital to understanding present forest patterns and predicting future forest dynamics in the Mediterranean mountains. We aimed to analyze and understand how land-use abandonment affected spatial modifications of landscapes in two study areas, 44,000 ha and 60,000 ha, located on the island of Corsica, France, representing a typical Mediterranean environment with chestnut forests. Our approach used land-cover archive documents... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Historical archives; Human population; Landscape patterns; Land-use change; Mediterranean ecosystems. |
| Ano: 2013 |
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