Woody vegetation dynamics in the tropical and subtropical Andes from 2001 to 2014: Satellite image interpretation and expert validation
Woody vegetation dynamics in the tropical and subtropical Andes from 2001 to 2014: Satellite image interpretation and expert validation
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2001年至2014年热带和亚热带安第斯山脉木本植被动态：卫星图像解释和专家验证
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发表时间：
2019
影响因子：
11.6
通讯作者：
K. Zimmerer
中科院分区：
文献类型：
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作者：
T. Aide;H. R. Grau;J. Graesser;M. Andrade;E. Aráoz;Ana P. Barros;Marconi Campos‐Cerqueira;E. Chacón;F. Cuesta;R. Espinoza;M. Peralvo;Molly H. Polk;X. Rueda;Adriana Sanchez;Kenneth R. Young;L. Zarbá;K. Zimmerer
气候和土地利用变化之间的相互作用决定了植物群和动物群的分布，并重新调整了世界各地的生物群落组成。热带山区特别敏感，因为它们通常人口密度高，农业历史悠久，物种分布范围有限，并且由于海拔梯度陡峭而具有高β多样性。在这里，我们评估了2001-2014年期间南美洲热带安第斯山脉木本植被分布的变化。为了进行分析，我们使用250米像素分辨率的MODIS卫星数据创建了年度土地覆盖/土地利用图，计算了115.47平方公里的9，274个六边形中的木本植被（树木和灌木）覆盖，然后确定每个六边形中是否存在统计学显著（p < 0.05）的14年线性趋势（正森林增加，负森林损失）。在1,308个具有显著趋势的六边形中，36.6%（n = 479）失去了森林，63.4%（n = 829）获得了森林。我们估计木本植被的总净收益约为50万公顷。海拔1 000 - 1 499米的地区森林损失最多，1 500米以上的地区森林增加最多。最重要的转变是低海拔地区牧场和农田的森林损失，中海拔地区废弃牧场和农田的森林增加，以及灌木侵入高原草原。专家验证证实了观察到的趋势，但一些地区的明显森林增益与新的树荫咖啡，松树，或桉树种植园。此外，在控制了海拔和国家之后，森林收益与农村人口的下降有关。尽管我们记录了森林覆盖的总体增长，但哥伦比亚最近森林增长的逆转表明，这些耦合的自然-人类系统是高度动态的，迫切需要一个区域性的真实的时间土地使用，生物多样性和生态系统服务监测网络。
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 km2, 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.
热带安第斯山脉的雪线和林线
影响因子：
3.9
作者：
Young, Kenneth R.;Ponette-González, Alexandra G.;Polk, Molly H.;Lipton, Jennifer K.
通讯作者：
Lipton, Jennifer K.
影响因子：
64.8
作者：
Fadrique, Belen;Baez, Selene;Feeley, Kenneth J.
通讯作者：
Feeley, Kenneth J.