DOI: 10.1111/gcb.12170
论文题名: Growth decline and divergent tree ring isotopic composition (δ13C and δ18O) contradict predictions of CO2 stimulation in high altitudinal forests
作者: Gómez-Guerrero A. ; Silva L.C.R. ; Barrera-Reyes M. ; Kishchuk B. ; Velázquez-Martínez A. ; Martínez-Trinidad T. ; Plascencia-Escalante F.O. ; Horwath W.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 6 起始页码: 1748
结束页码: 1758
语种: 英语
英文关键词: Abies religiosa
; Climate change
; CO 2
; Drought stress
; High-elevation forests
; Mexico
; Pinus hartwegii
; Stable isotopes
Scopus关键词: carbon
; carbon dioxide
; oxygen
; carbon dioxide
; climate change
; climate prediction
; dendrochronology
; drought stress
; forest dynamics
; growth rate
; isotopic composition
; stable isotope
; tree ring
; altitude
; article
; growth, development and aging
; tree
; Altitude
; Carbon Dioxide
; Carbon Isotopes
; Oxygen Isotopes
; Trees
; Mexico [North America]
; Abies
; Abies religiosa
; Pinus hartwegii
英文摘要: Human-induced changes in atmospheric composition are expected to affect primary productivity across terrestrial biomes. Recent changes in productivity have been observed in many forest ecosystems, but low-latitude upper tree line forests remain to be investigated. Here, we use dendrochronological methods and isotopic analysis to examine changes in productivity, and their physiological basis, in Abies religiosa (Ar) and Pinus hartwegii (Ph) trees growing in high-elevation forests of central Mexico. Six sites were selected across a longitudinal transect (Transverse Volcanic Axis), from the Pacific Ocean toward the Gulf of Mexico, where mature dominant trees were sampled at altitudes ranging from 3200 to 4000 m asl. A total of 60 Ar and 84 Ph trees were analyzed to describe changes in growth (annual-resolution) and isotopic composition (decadal-resolution) since the early 1900s. Our results show an initial widespread increase in basal area increment (BAI) during the first half of the past century. However, BAI has decreased significantly since the 1950s with accentuated decline after the 1980s in both species and across sites. We found a consistent reduction in atmosphere to wood 13C discrimination, resulting from increasing water use efficiency (20-60%), coinciding with rising atmospheric CO2. Changes in 13C discrimination were not followed, however, by shifts in tree ring δ18O, indicating site- and species-specific differences in water source or uptake strategy. Our results indicate that CO2 stimulation has not been enough to counteract warming-induced drought stress, but other stressors, such as progressive nutrient limitation, could also have contributed to growth decline. Future studies should explore the distinct role of resource limitation (water vs. nutrients) in modulating the response of high-elevation ecosystems to atmospheric change. © 2013 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62435
Appears in Collections: 影响、适应和脆弱性
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作者单位: Colegio de Postgraduados, Postgrado Forestal Km. 36.5 Carretera Mexico-Texcoco, CP, Montecillo, Texcoco, 56230, Mexico; Biogeochemistry and Nutrient Cycling Laboratory, Department of Land Air and Water Resources, University of California, Davis, CA, United States; Natural Resources Canada, Canadian Forest Service, Northern Forestry Centre, 5320 122nd Street, Edmonton, T6H 3S5, AB, Canada
Recommended Citation:
Gómez-Guerrero A.,Silva L.C.R.,Barrera-Reyes M.,et al. Growth decline and divergent tree ring isotopic composition (δ13C and δ18O) contradict predictions of CO2 stimulation in high altitudinal forests[J]. Global Change Biology,2013-01-01,19(6)