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Topography alters tree growth–climate relationships in a semi-arid forested catchment

Journal Article · · Ecosphere
DOI:https://doi.org/10.1890/ES14-00296.1· OSTI ID:1454921
 [1];  [2];  [2]
  1. Univ. of Colorado, Boulder, CO (United States). Inst. of Arctic and Alpine Research. Dept. of Geography; University of Colorado
  2. Univ. of Colorado, Boulder, CO (United States). Inst. of Arctic and Alpine Research. Dept. of Geography
Topography and climate play an integral role in the spatial variability and annual dynamics of aboveground carbon sequestration. Despite knowledge of vegetation–climate–topography relationships on the landscape and hillslope scales, little is known about the influence of complex terrain coupled with hydrologic and topoclimatic variation on tree growth and physiology at the catchment scale. Climate change predictions for the semi-arid, western United States include increased temperatures, more frequent and extreme drought events, and decreases in snowpack, all of which put forests at risk of drought induced mortality and enhanced susceptibility to disturbance events. In this study, we determine how species-specific tree growth patterns and water use efficiency respond to interannual climate variability and how this response varies with topographic position. We found that Pinus contorta and Pinus ponderosa both show significant decreases in growth with water-limiting climate conditions, but complex terrain mediates this response by controlling moisture conditions in variable topoclimates. Foliar carbon isotope analyses show increased water use efficiency during drought for Pinus contorta, but indicate no significant difference in water use efficiency of Pinus ponderosa between a drought year and a non-drought year. The responses of the two pine species to climate indicate that semi-arid forests are especially susceptible to changes and risks posed by climate change and that topographic variability will likely play a significant role in determining the future vegetation patterns of semi-arid systems.
Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
SC0006968
OSTI ID:
1454921
Journal Information:
Ecosphere, Journal Name: Ecosphere Journal Issue: 11 Vol. 5; ISSN 2150-8925
Publisher:
Ecological Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (26)

The role of local-scale heterogeneities in terrestrial ecosystem modeling journal February 2015
Hydrological partitioning in the critical zone: Recent advances and opportunities for developing transferable understanding of water cycle dynamics: CRITICAL ZONE HYDROLOGY journal September 2015
Hillslope Topography Mediates Spatial Patterns of Ecosystem Sensitivity to Climate: Forest Productivity in Complex Terrain journal February 2018
Topography may mitigate drought effects on vegetation along a hillslope gradient journal March 2017
Topographically driven differences in energy and water constrain climatic control on forest carbon sequestration journal April 2017
Impacts of growing‐season climate on tree growth and post‐fire regeneration in ponderosa pine and Douglas‐fir forests journal April 2019
Intra-annual density fluctuations (IADFs) inPinus nigra(J. F. Arnold) at high-elevation in the central Apennines (Italy) journal January 2020
Overstorey–Understorey Interactions Intensify After Drought-Induced Forest Die-Off: Long-Term Effects for Forest Structure and Composition journal September 2017
Quantifying individual tree growth and tree competition using bi-temporal airborne laser scanning data: a case study in the Sierra Nevada Mountains, California journal May 2017
Fine-scale modeling of bristlecone pine treeline position in the Great Basin, USA journal January 2017
Single-provenance mature conifers show higher non-structural carbohydrate storage and reduced growth in a drier location journal May 2017
Multiple factors modulate tree growth complementarity in Central European mixed forests journal September 2017
Refining predictions of population decline at species' rear edges journal February 2019
Plant hydraulics improves and topography mediates prediction of aspen mortality in southwestern USA journal July 2016
Accounting for landscape heterogeneity improves spatial predictions of tree vulnerability to drought journal July 2018
Summer dry-down modulates the isotopic composition of soil CO2 production in snow-dominated landscapes journal May 2018
Intra-annual density fluctuations (IADFs) inPinus nigra(J. F. Arnold) at high-elevation in the central Apennines (Italy) text January 2020
Intra-annual density fluctuations (IADFs) in Pinus nigra (J. F. Arnold) at high-elevation in the central Apennines (Italy) text January 2020
Intra-annual density fluctuations (IADFs) in Pinus nigra (J. F. Arnold) at high-elevation in the central Apennines (Italy) text January 2020
On underestimation of global vulnerability to tree mortality and forest die-off from hotter drought in the Anthropocene journal August 2015
Forest Management Challenges for Sustaining Water Resources in the Anthropocene journal March 2016
Landscape Topoedaphic Features Create Refugia from Drought and Insect Disturbance in a Lodgepole and Whitebark Pine Forest journal November 2018
Assessment of the Biomass Productivity Decline in the Lower Mekong Basin journal November 2019
Identification of key parameters controlling demographically structured vegetation dynamics in a land surface model: CLM4.5(FATES) journal January 2019
Single-provenance mature conifers show higher non-structural carbohydrate storage and reduced growth in a drier location text January 2017
Quantifying individual tree growth and tree competition using bi-temporal airborne laser scanning data: a case study in the Sierra Nevada Mountains, California text January 2017

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