globalchange  > 过去全球变化的重建
DOI: 10.1002/ecy.2677
WOS记录号: WOS:000474127300005
论文题名:
Fragmentation, forest structure, and topography modulate impacts of drought in a tropical forest landscape
作者: Schwartz, Naomi B.1,2,3; Budsock, Andrew M.3; Uriarte, Maria3
通讯作者: Schwartz, Naomi B.
刊名: ECOLOGY
ISSN: 0012-9658
EISSN: 1939-9170
出版年: 2019
卷: 100, 期:6
语种: 英语
英文关键词: drought ; landscape fragmentation ; light detection and ranging (LiDAR) ; Puerto Rico ; random forest ; remote sensing ; second growth ; tropical forest
WOS关键词: TREE MORTALITY ; CLIMATE-CHANGE ; SOIL-MOISTURE ; AMAZON FOREST ; RAIN-FOREST ; IMAGING SPECTROSCOPY ; CLOUD SHADOW ; WATER-USE ; EL-NINO ; DYNAMICS
WOS学科分类: Ecology
WOS研究方向: Environmental Sciences & Ecology
英文摘要:

Climate models predict increases in drought conditions in many parts of the tropics. Yet the response of tropical forests to drought remains highly uncertain, especially with regards to the factors that generate spatial heterogeneity in drought response across landscapes. In this study, we used Landsat imagery to assess the impacts of a severe drought in 2015 across an 80,000-ha landscape in Puerto Rico. Specifically, we asked whether drought effects varied systematically with topography and with forest age, height, and fragmentation. We quantified drought impacts using anomalies of two vegetation indices, the enhanced vegetation index (EVI) and normalized difference water index (NDWI), and fit random forest models of these metrics including slope, aspect, forest age, canopy height, and two indices of fragmentation as predictors. Drought effects were more severe on drier topographic positions, that is, steeper slopes and southwest-facing aspects, and in second-growth forests. Shorter and more fragmented forests were also more strongly affected by drought. We also assessed which factors were associated with stronger recovery from drought. Factors associated with more negative drought anomalies were also associated with more positive postdrought anomalies, suggesting that increased light availability as a result of drought led to high rates of recovery in forests more severely affected by drought. In general, recovery from drought was rapid across the landscape, with postdrought anomalies at or above average across the study area. This suggests that forests in Puerto Rico might be resilient to a single-year drought, though vulnerability to drought varies depending on forest characteristics and landscape position.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/139938
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作者单位: 1.Univ British Columbia, Dept Geog, 1984 West Mall, Vancouver, BC V6T 1Z2, Canada
2.Univ Minnesota, Dept Ecol Evolut & Behav, 1479 Gortner Ave, St Paul, MN 55108 USA
3.Columbia Univ, Dept Ecol Evolut & Environm Biol, 1200 Amsterdam Ave, New York, NY 10027 USA

Recommended Citation:
Schwartz, Naomi B.,Budsock, Andrew M.,Uriarte, Maria. Fragmentation, forest structure, and topography modulate impacts of drought in a tropical forest landscape[J]. ECOLOGY,2019-01-01,100(6)
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