DOI: 10.1016/j.foreco.2013.08.026
Scopus记录号: 2-s2.0-84884128153
论文题名: Homogenization in forest performance across an environmental gradient - The interplay between rainfall and topographic aspect
作者: Dorman M. ; Svoray T. ; Perevolotsky A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 310 起始页码: 256
结束页码: 266
语种: 英语
英文关键词: Aerial photography
; Landsat
; Normalized Difference Vegetation Index (NDVI)
; Pinus halepensis
; Solar radiation
; Tree mortality
Scopus关键词: Environmental gradient
; Global climate changes
; LANDSAT
; LANDSAT satellite images
; Normalized difference vegetation index
; Pinus halepensis
; Remote sensing and GIS
; Tree mortality
; Aerial photography
; Arid regions
; Climate change
; Drought
; Ecosystems
; Rain
; Satellite imagery
; Soil moisture
; Solar radiation
; Sun
; Water levels
; Forestry
; aerial photography
; afforestation
; arid region
; climate change
; coniferous forest
; drought stress
; environmental factor
; environmental gradient
; forest ecosystem
; GIS
; global climate
; homogeneity
; Landsat
; limiting factor
; monoculture
; mortality
; NDVI
; rainfall
; satellite imagery
; solar radiation
; topographic effect
; topographic mapping
; water availability
; Air Craft
; Drought
; Ecosystems
; Forestry
; Image Analysis
; Moisture
; Photography
; Pinus Halepensis
; Rain
; Satellites
; Soil
; Sun Light
; Israel
英文摘要: This study aimed to investigate the interaction between local and regional environmental factors that affect forest performance during drought periods. In previous studies, contradictory results regarding the effect of aspect on forests performance, under different settings, were reported. However, each study focused on a different forest ecosystem at a different time frame, making synthesis inadequate. Monoculture planted Pinus halepensis forests in Israel, covering a broad climatic gradient (200-850. mm annual rainfall), form a suitable study system to address this question.We used remote sensing and GIS methods to observe a large number of afforested stands over a wide area at high resolution. Normalized Difference Vegetation Index (NDVI), obtained from Landsat satellite images for 14. years between 1994 and 2011, served as an inclusive measure of forest performance. Data on the examined environmental factors were obtained from spatially interpolated annual rainfall maps and a topographic aspects map. The effects of aspect on NDVI were evaluated separately for three regions along the rainfall gradient: arid (200-350. mm), intermediate (350-500. mm), and humid (500-850. mm).During the studied period, NDVI declined in the arid region but remained constant in the intermediate and humid regions. NDVI was positively related to annual rainfall in all three regions. The effect of aspect on NDVI was positively associated with rainfall in the arid region, but not in the intermediate and humid regions. In other words, forest performance homogenization across local habitats occurred in the arid region under drought stress. Relatively wet years were characterized by high NDVI values (~0.4), with large differences (~0.025) between northern and southern aspects, whereas dry years were characterized by low NDVI values (~0.3) and small differences (~0.01).The present study supports the concept that under severe drought stress forest performance becomes more homogeneous across local habitats, both temporally (in drought years) and spatially (towards the arid forest boundary). Performance homogenization may occur when low soil water levels are reached, and climatic conditions become the dominant limiting factor. When water availability is high enough, differential performance responses among local habitats are maintained. We evaluated the trends and relations among local and regional environmental factors on performance, and assessed their relative effect sizes. Such an evaluation is essential to link local and global studies aimed at predicting the fate of forests facing global climate change. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66329
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Geography and Environmental Development, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel; Department of Agronomy and Natural Resources, Agricultural Research Organization, Volcani Ctr, Bet Dagan 50250, Israel
Recommended Citation:
Dorman M.,Svoray T.,Perevolotsky A.. Homogenization in forest performance across an environmental gradient - The interplay between rainfall and topographic aspect[J]. Forest Ecology and Management,2013-01-01,310