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Title: Taking off the training wheels: the properties of a dynamic vegetation model without climate envelopes

Journal Article · · Geoscientific Model Development Discussions (Online)
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  1. National Center for Atmospheric Research, Boulder, CO (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Woods Hole Research Center, Falmouth, MA (United States)

We describe an implementation of the Ecosystem Demography (ED) concept in the Community Land Model. The structure of CLM(ED) and the physiological and structural modifications applied to the CLM are presented. A major motivation of this development is to allow the prediction of biome boundaries directly from plant physiological traits via their competitive interactions. Here we investigate the performance of the model for an example biome boundary in Eastern North America. We explore the sensitivity of the predicted biome boundaries and ecosystem properties to the variation of leaf properties determined by the parameter space defined by the GLOPNET global leaf trait database. Further, we investigate the impact of four sequential alterations to the structural assumptions in the model governing the relative carbon economy of deciduous and evergreen plants. The default assumption is that the costs and benefits of deciduous vs. evergreen leaf strategies, in terms of carbon assimilation and expenditure, can reproduce the geographical structure of biome boundaries and ecosystem functioning. We find some support for this assumption, but only under particular combinations of model traits and structural assumptions. Many questions remain regarding the preferred methods for deployment of plant trait information in land surface models. In some cases, plant traits might best be closely linked with each other, but we also find support for direct linkages to environmental conditions. We advocate for intensified study of the costs and benefits of plant life history strategies in different environments, and for the increased use of parametric and structural ensembles in the development and analysis of complex vegetation models.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1208878
Journal Information:
Geoscientific Model Development Discussions (Online), Vol. 8, Issue 4; ISSN 1991-962X
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Interspecific integration of trait dimensions at local scales: the plant phenotype as an integrated network journal March 2017
Synergistic Ecoclimate Teleconnections from Forest Loss in Different Regions Structure Global Ecological Responses journal November 2016
Responses of leaf traits to climatic gradients: adaptive variation versus compositional shifts journal January 2015
Toward accounting for ecoclimate teleconnections: intra- and inter-continental consequences of altered energy balance after vegetation change journal October 2015
Spectral diversity area relationships for assessing biodiversity in a wildland-agriculture matrix journal September 2016
Global patterns of drought deciduous phenology in semi-arid and savanna-type ecosystems journal November 2016
Vegetation demographics in Earth System Models: A review of progress and priorities journal October 2017
Environmental drivers of drought deciduous phenology in the Community Land Model journal January 2015
Environmental drivers of drought deciduous phenology in the Community Land Model journal January 2015
Estimating heterotrophic respiration at large scales: challenges, approaches, and next steps journal June 2016

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