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California annual grass phenology and allometry influence ecosystem dynamics and fire regime in a vegetation demography model

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.20421· OSTI ID:2565873
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [7];  [3];  [1]
  1. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
  2. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  4. University of California, Berkeley, CA (United States)
  5. Univ. of California, Los Angeles, CA (United States)
  6. National Center for Atmospheric Research (NCAR), Boulder, CO (United States)
  7. Univ. of Wyoming, Laramie, WY (United States)
Grass-dominated ecosystems cover wide areas of the land surface yet have received far less attention from the Earth System Model (ESM) community. This limits model projections of ecosystem dynamics in response to global change and coupled vegetation–climate dynamics. We used the Functionally Assembled Terrestrial Ecosystem Simulator (FATES), a dynamic vegetation demography model, to determine ecosystem sensitivity to alternate, observed grass allometries and biophysical traits, and evaluated model performance in capturing California C3 annual grasslands structure and fire regimes. Grass allometry, leaf physiology, plant phenology, and plant mortality all drove the seasonal variation in matter and energy exchange and fire dynamics in California annual grasslands. Allometry influenced grassland structure and function mainly through canopy architecture-mediated space and light competition instead of through carbon partitioning strategy. Regional variation in grassland annual burned area was driven by variation in ecosystem productivity. Our study advances the modeling of grassy ecosystems in ESMs by establishing the importance of grass allometry and plant phenology and mortality in driving C3 annual grassland seasonal dynamics and fire regime. The calibrated annual grass allometry and biophysical traits presented can be applied in future studies to project climate–vegetation–fire feedbacks in annual grass-dominant ecosystems under global change.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science (BSS)
Grant/Contract Number:
89233218CNA000001; AC02-05CH11231
OSTI ID:
2565873
Alternate ID(s):
OSTI ID: 2572933
Report Number(s):
LA-UR--24-31730; ark:/13030/qt3rp992df; 1469-8137; 10.1111/nph.20421
Journal Information:
New Phytologist, Journal Name: New Phytologist Journal Issue: 6 Vol. 245; ISSN 1469-8137; ISSN 0028-646X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

References (81)

The Impact of Parametric Uncertainties on Biogeochemistry in the E3SM Land Model journal February 2018
Allometric relationships and trade‐offs in 11 common Mediterranean‐climate grasses journal April 2024
Modeling annual grassland phenology along the central coast of California journal July 2017
Increasing effects of chronic nutrient enrichment on plant diversity loss and ecosystem productivity over time journal January 2021
Patterns of Growth and Soil-water Utilization in some Exotic Annuals and Native Perennial Bunchgrasses of California journal August 1996
Adaptive traits of wild barley plants of Mediterranean and desert origin journal October 2002
Phenological observations of grass curing in Germany journal June 2010
The Effects of Interannual Rainfall Variability on Tree–Grass Composition Along Kalahari Rainfall Gradient journal December 2016
Positive fire–grass feedback in Mediterranean Basin woodlands journal June 2001
Seasonal variation in carbon dioxide exchange over a Mediterranean annual grassland in California journal May 2004
How plant functional-type, weather, seasonal drought, and soil physical properties alter water and energy fluxes of an oak–grass savanna and an annual grassland journal May 2004
Data-driven diagnostics of terrestrial carbon dynamics over North America journal October 2014
Grazing and aridity reduce perennial grass abundance in semi-arid rangelands – Insights from a trait-based dynamic vegetation model journal March 2019
Trends and drivers of fire activity vary across California aridland ecosystems journal September 2017
The evolution of drought escape and avoidance in natural herbaceous populations journal May 2015
Savanna fire regimes depend on grass trait diversity journal September 2022
Plant allometry: is there a grand unifying theory? journal January 1999
Inverse estimation of Vc max , leaf area index, and the Ball-Berry parameter from carbon and energy fluxes journal January 2006
Mechanistic scaling of ecosystem function and dynamics in space and time: Ecosystem Demography model version 2 journal January 2009
Disentangling Climate and LAI Effects on Seasonal Variability in Water Use Efficiency Across Terrestrial Ecosystems in China journal August 2018
The Community Land Model Version 5: Description of New Features, Benchmarking, and Impact of Forcing Uncertainty journal December 2019
The DOE E3SM Coupled Model Version 1: Overview and Evaluation at Standard Resolution journal July 2019
Evaluation of a Reanalysis‐Driven Configuration of WRF4 Over the Western United States From 1980 to 2020 journal February 2022
The balanced-growth hypothesis and the allometry of leaf and root biomass allocation journal June 2002
Evaluation of ecosystem dynamics, plant geography and terrestrial carbon cycling in the LPJ dynamic global vegetation model journal February 2003
Rooting depths, lateral root spreads and below-ground/above-ground allometries of plants in water-limited ecosystems journal May 2002
Exotic annual grass invasion alters fuel amounts, continuity and moisture content journal January 2013
Effects of curing on grassfires: II. Effect of grass senescence on the rate of fire spread journal January 2015
Characterisation of the fuel and fire environment in southern Ontario’s tallgrass prairie journal January 2015
Modelling the Effect of Grassland Fuel Bed Structure on the Headfire Rate of Spread journal August 2022
Rate of Spread of Free-Burning Fires in Woody Fuels in a Wind Tunnel journal January 1998
Vegetation, Fire, and Feedbacks: A Disturbance‐Mediated Model of Savannas journal December 2009
Rates of litter decomposition in terrestrial ecosystems: global patterns and controlling factors journal March 2008
Life history is a key factor explaining functional trait diversity among subtropical grasses, and its influence differs between C3 and C4 species journal February 2019
Disturbance maintains alternative biome states journal October 2015
Introduced annual grass increases regional fire activity across the arid western USA (1980-2009) journal November 2012
Inclusion of ecologically based trait variation in plant functional types reduces the projected land carbon sink in an earth system model journal March 2015
Vegetation demographics in Earth System Models: A review of progress and priorities journal October 2017
TRY plant trait database – enhanced coverage and open access journal December 2019
Accounting for herbaceous communities in process‐based models will advance our understanding of “grassy” ecosystems journal October 2023
The Adaptive Significance of Drought Escape in Avena Barbata, an Annual Grass journal December 2006
Growth-survival trade-offs and allometries in rosette-forming perennials journal April 2006
Consistency between an allometric approach and optimal partitioning theory in global patterns of plant biomass allocation journal August 2007
Are temporal variations of leaf traits responsible for seasonal and inter‐annual variability in ecosystem CO 2 exchange? journal September 2010
Impacts of climate change on the vegetation of Africa: an adaptive dynamic vegetation modelling approach journal September 2009
Leaf traits and litter flammability: evidence for non-additive mixture effects in a temperate forest journal May 2012
Effects of invasion of fire‐free arid shrublands by a fire‐promoting invasive alien grass (Pennisetum setaceum) in South Africa journal November 2009
Fuels or microclimate? Understanding the drivers of fire feedbacks at savanna-forest boundaries: FLAMMABILITY OF SAVANNA-FOREST BOUNDARY journal November 2011
Ecophysiological traits in C3 and C4 grasses: a phylogenetically controlled screening experiment journal December 2009
Does inherent flammability of grass and litter fuels contribute to continental patterns of landscape fire activity? journal October 2016
Increasing atmospheric CO2 overrides the historical legacy of multiple stable biome states in Africa journal October 2013
Dimensions of plant flammability journal March 2015
Drought regimens predict life history strategies in Heliophila journal June 2019
Lineage‐based functional types: characterising functional diversity to enhance the representation of ecological behaviour in Land Surface Models journal July 2020
Simulating environmentally‐sensitive tree recruitment in vegetation demographic models journal March 2022
Linking resource‐ and disturbance‐based models to explain tree–grass coexistence in savannas journal December 2022
Estimating the sensitivity of stomatal conductance to photosynthesis: a review: The sensitivity of conductance to photosynthesis journal February 2017
Grassland soil carbon sequestration: Current understanding, challenges, and solutions journal August 2022
Latin hypercube sampling as a tool in uncertainty analysis of computer models conference January 1992
Tree-Grass Interactions in Savannas journal November 1997
Relationships between GPP, Satellite Measures of Greenness and Canopy Water Content with Soil Moisture in Mediterranean-Climate Grassland and Oak Savanna journal January 2011
Twenty-first century California, USA, wildfires: fuel-dominated vs. wind-dominated fires journal July 2019
The Coordination of Leaf Photosynthesis Links C and N Fluxes in C3 Plant Species journal June 2012
Development of a 2001 National Land-Cover Database for the United States journal July 2004
Tree cover in sub-Saharan Africa: Rainfall and fire constrain forest and savanna as alternative stable states journal May 2011
Multispecies Allometric Models Predict Grass Biomass in Semidesert Rangeland journal January 2009
Strategies in Mediterranean grassland annuals in relation to stress and disturbance journal June 1993
Changes in grassland canopy structure across a precipitation gradient journal February 2000
Evolution and origin of the Central Grassland of North America: climate, fire, and mammalian grazers 1 journal October 2006
Trait Acclimation Mitigates Mortality Risks of Tropical Canopy Trees under Global Warming journal May 2016
Reprocessed MODIS Version 6.1 Leaf Area Index Dataset and Its Evaluation for Land Surface and Climate Modeling journal March 2023
Cattle Grazing Moderates Greenhouse Gas and Particulate Matter Emissions from California Grassland Wildfires journal September 2023
Cattle grazing reduces fuel and leads to more manageable fire behavior journal October 2022
Improving simulated Amazon forest biomass and productivity by including spatial variation in biophysical parameters journal January 2013
Benchmarking and parameter sensitivity of physiological and vegetation dynamics using the Functionally Assembled Terrestrial Ecosystem Simulator (FATES) at Barro Colorado Island, Panama journal January 2020
Assessing climate change impacts on live fuel moisture and wildfire risk using a hydrodynamic vegetation model journal January 2021
Capturing functional strategies and compositional dynamics in vegetation demographic models journal July 2021
The influence of vegetation, fire spread and fire behaviour on biomass burning and trace gas emissions: results from a process-based model journal January 2010
Dynamic ecosystem assembly and escaping the “fire trap” in the tropics: insights from FATES_15.0.0 journal June 2024
Taking off the training wheels: the properties of a dynamic vegetation model without climate envelopes, CLM4.5(ED) journal January 2015
Mediterranean-climate oak savannas: the interplay between abiotic environment and species interactions journal June 2009