DOI: 10.1111/gcb.12915
论文题名: Spatial and topographic trends in forest expansion and biomass change, from regional to local scales
作者: Buma B. ; Barrett T.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 9 起始页码: 3445
结束页码: 3454
语种: 英语
英文关键词: Climate change
; Disturbance
; Forest change
; North America
; Temperate rainforest biome
Scopus关键词: biomass
; biome
; carbon sequestration
; climate change
; environmental disturbance
; forest dynamics
; rainforest
; spatial analysis
; topography
; trend analysis
; Alaska
; United States
; carbon
; Alaska
; biomass
; carbon sequestration
; climate change
; drought
; geography
; growth, development and aging
; rain forest
; tree
; Alaska
; Biomass
; Carbon
; Carbon Sequestration
; Climate Change
; Droughts
; Geography
; Rainforest
; Trees
英文摘要: Natural forest growth and expansion are important carbon sequestration processes globally. Climate change is likely to increase forest growth in some regions via CO2 fertilization, increased temperatures, and altered precipitation; however, altered disturbance regimes and climate stress (e.g. drought) will act to reduce carbon stocks in forests as well. Observations of asynchrony in forest change is useful in determining current trends in forest carbon stocks, both in terms of forest density (e.g. Mg ha-1) and spatially (extent and location). Monitoring change in natural (unmanaged) areas is particularly useful, as while afforestation and recovery from historic land use are currently large carbon sinks, the long-term viability of those sinks depends on climate change and disturbance dynamics at their particular location. We utilize a large, unmanaged biome (>135 000 km2) which spans a broad latitudinal gradient to explore how variation in location affects forest density and spatial patterning: the forests of the North American temperate rainforests in Alaska, which store >2.8 Pg C in biomass and soil, equivalent to >8% of the C in contiguous US forests. We demonstrate that the regional biome is shifting; gains exceed losses and are located in different spatio-topographic contexts. Forest gains are concentrated on northerly aspects, lower elevations, and higher latitudes, especially in sheltered areas, whereas loss is skewed toward southerly aspects and lower latitudes. Repeat plot-scale biomass data (n = 759) indicate that within-forest biomass gains outpace losses (live trees >12.7 cm diameter, 986 Gg yr-1) on gentler slopes and in higher latitudes. This work demonstrates that while temperate rainforest dynamics occur at fine spatial scales (<1000 m2), the net result of thousands of individual events is regionally patterned change. Correlations between the disturbance/establishment imbalance and biomass accumulation suggest the potential for relatively rapid biome shifts and biomass changes. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61895
Appears in Collections: 影响、适应和脆弱性
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作者单位: University of Alaska Southeast, 11120 Glacier Highway, Juneau, AK, United States; Pacific Northwest Research Station, USDA Forest Service, 1133 N. Western Ave., Wenatchee, WA, United States
Recommended Citation:
Buma B.,Barrett T.M.. Spatial and topographic trends in forest expansion and biomass change, from regional to local scales[J]. Global Change Biology,2015-01-01,21(9)