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Regional-Scale Relationships Of Leaf Area Index To Specific Leaf Area And Leaf Nitrogen Content, Lars E. Pierce, Steven W. Running, Joe Walker
Regional-Scale Relationships Of Leaf Area Index To Specific Leaf Area And Leaf Nitrogen Content, Lars E. Pierce, Steven W. Running, Joe Walker
Numerical Terradynamic Simulation Group Publications
Specific leaf area (SLA) is an important link between vegetation water and carbon cycles because it describes the allocation of leaf biomass per unit of leaf area. Several studies in many vegetation types have shown that canopy SLA is closely related to canopy leaf nitrogen (N) content and photosynthetic capacity. SLA increases as light is attenuated by leaf area down through a plant canopy. It therefore follows that across an individual biome the spatial patterns in canopy—average SLA and leaf N content should be significantly correlated with the spatial patterns in leaf area index (LAI) and canopy transmittance. In this …
Testing Forest-Bgc Ecosystem Process Simulations Across A Climatic Gradient In Oregon, Steven W. Running
Testing Forest-Bgc Ecosystem Process Simulations Across A Climatic Gradient In Oregon, Steven W. Running
Numerical Terradynamic Simulation Group Publications
Field measurements from the Oregon Transect Ecological Research project (OTTER) were used to validate selected process simulations in the FOREST—BGC ecosystem model. Certain hydrologic, carbon, and nitrogen cycle process simulations were tested in this validation, either comparatively across sites, or seasonally at single sites. The range of simulated ecosystem—process rates across the OTTER sites was large; annual evapotranspiration (ET) ranged from 15 to 82 cm, net photosynthesis (as carbon) from 2.2 to 22.8 Mg/ha, and decomposition (as carbon) from 1.0 to 7.2 Mg°ha—1°yr—1. High correlations between predicted and measured data were found for: aboveground …
Validating Diurnal Climatology Logic Of The Mt-Clim Model Across A Climatic Gradient In Oregon, Joseph Marion Glassy, Steven W. Running
Validating Diurnal Climatology Logic Of The Mt-Clim Model Across A Climatic Gradient In Oregon, Joseph Marion Glassy, Steven W. Running
Numerical Terradynamic Simulation Group Publications
This study tests diurnal climatology assumptions made in the MT—CLIM model by examining two microclimate variables driven by diurnal atmospheric dynamics: incident solar radiation (in kilojoules per square metre), and humidity, expressed as vapor pressure deficit, VPD (in kilopascals). The relative VPD humidity comparison was used to test our hypothesis that night minimum temperatures can function as a surrogate for dew—point temperatures. VPD was chosen as the humidity measure for these tests since plants are more directly sensitive of this measure than relative humidity. For the observed vs. examined vapor pressure deficit models, we obtained coefficients of determination (R2 …