Academic Journal
Woody vegetation dynamics in the tropical and subtropical Andes from 2001 to 2014: Satellite image interpretation and expert validation
| العنوان: | Woody vegetation dynamics in the tropical and subtropical Andes from 2001 to 2014: Satellite image interpretation and expert validation |
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| المؤلفون: | Aide, T. Mitchell, Grau, Hector Ricardo, Graesser, Jordan, Andrade Nuñez, Maria Jose, Aráoz, Ezequiel, Barros, Ana, Campos Cerqueira, Marconi, Chacon-Moreno, Eulogio, Cuesta, Francisco, Espinoza, Raúl, Peralvo, Manuel, Polk, Molly H., Rueda, Ximena, Sanchez, Adriana, Young, Kenneth R., Zarbá, Lucía, Zimmerer, Karl S. |
| بيانات النشر: | Wiley Blackwell Publishing, Inc |
| المجموعة: | CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
| مصطلحات موضوعية: | AGRICULTURE, COUPLED NATURAL HUMAN SYSTEMS, EXPERT VALIDATION, FOREST LOSS AND REGENERATION, MODIS SATELLITE IMAGERY, https://purl.org/becyt/ford/1.5, https://purl.org/becyt/ford/1 |
| الوصف: | The interactions between climate and land-use change are dictating the distribution of flora and fauna and reshuffling biotic community composition around the world. Tropical mountains are particularly sensitive because they often have a high human population density, a long history of agriculture, range-restricted species, and high-beta diversity due to a steep elevation gradient. Here we evaluated the change in distribution of woody vegetation in the tropical Andes of South America for the period 2001–2014. For the analyses we created annual land-cover/land-use maps using MODIS satellite data at 250 m pixel resolution, calculated the cover of woody vegetation (trees and shrubs) in 9,274 hexagons of 115.47 km 2 , and then determined if there was a statistically significant (p < 0.05) 14 year linear trend (positive—forest gain, negative—forest loss) within each hexagon. Of the 1,308 hexagons with significant trends, 36.6% (n = 479) lost forests and 63.4% (n = 829) gained forests. We estimated an overall net gain of ~500,000 ha in woody vegetation. Forest loss dominated the 1,000–1,499 m elevation zone and forest gain dominated above 1,500 m. The most important transitions were forest loss at lower elevations for pastures and croplands, forest gain in abandoned pastures and cropland in mid-elevation areas, and shrub encroachment into highland grasslands. Expert validation confirmed the observed trends, but some areas of apparent forest gain were associated with new shade coffee, pine, or eucalypt plantations. In addition, after controlling for elevation and country, forest gain was associated with a decline in the rural population. Although we document an overall gain in forest cover, the recent reversal of forest gains in Colombia demonstrates that these coupled natural-human systems are highly dynamic and there is an urgent need of a regional real-time land-use, biodiversity, and ecosystem services monitoring network. ; Fil: Aide, T. Mitchell. Universidad de Puerto Rico; Puerto Rico ; Fil: Grau, Hector ... |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1354-1013 1365-2486 |
| Relation: | http://hdl.handle.net/11336/148374; Aide, T. Mitchell; Grau, Hector Ricardo; Graesser, Jordan; Andrade Nuñez, Maria Jose; Aráoz, Ezequiel; et al.; Woody vegetation dynamics in the tropical and subtropical Andes from 2001 to 2014: Satellite image interpretation and expert validation; Wiley Blackwell Publishing, Inc; Global Change Biology; 25; 6; 6-2019; 2112-2126; CONICET Digital; CONICET |
| الاتاحة: | http://hdl.handle.net/11336/148374 |
| Rights: | info:eu-repo/semantics/openAccess ; https://creativecommons.org/licenses/by/2.5/ar/ |
| رقم الانضمام: | edsbas.77CAEE3D |
| قاعدة البيانات: | BASE |
| تدمد: | 13541013 13652486 |
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