Modeling temperature and humidity profiles within forest canopies

Flerchinger, G. N.; Reba, M. L.; Link, Timothy E.; Marks, Danny

doi:10.1016/j.agrformet.2015.07.007

Cited by 28 publications

(20 citation statements)

References 38 publications

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“…Existen evidencias de que los cambios en la cobertura de la vegetación pueden modificar las condiciones climáticas a escala local, regional y global (Adams 2007;Lee et al 2011;Anderson-Teixeira et al 2012;Houspanossian et al 2013;Flerchinger et al 2015). A su vez, pueden tener efectos sobre la interfaz broza-suelo donde se produce la descomposición (Eviner and Chapin 2003;Yates et al 2000;Schiling et al 2016 o similares).…”

Section: D��unclassified

“…A su vez, una mayor temperatura podría deberse a que en arbustales y bosques existe una mayor superficie oscura de troncos, ramas y broza sobre el suelo, que podría retener calor incluso durante la noche, cuando el efecto de la rugosidad en disipar calor sería más importante (Eviner and Chapin 2003;Adams 2007). En particular, la retención de calor podría ser significativa bajo el dosel; así afectaría a la interfaz broza-suelo donde ocurre la descomposición debido a que el aire bajo el dosel es menos mezclado por el viento que el aire sobre las copas (Adams 2007;Flerchinger et al 2015).…”

Section: D��unclassified

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Uso de la tierra y ambiente local de descomposición en el Chaco Semiárido de Córdoba, Argentina

et al. 2017

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R��.El cambio en el uso de la tierra es un proceso clave debido a sus efectos directos sobre la identidad y la estructura de la vegetación. En el Chaco Semiárido se conoce poco acerca del impacto de los cambios en la vegetación sobre los procesos relacionados con el ciclado de nutrientes (e.g., la descomposición). En este trabajo analizamos si las modificaciones en la vegetación, producto de distintas intensidades en el uso de la tierra, producen cambios en las condiciones del ambiente local, y si estos cambios afectan el patrón de descomposición de dos materiales comunes. En las configuraciones vegetales analizadas encontramos que el cambio en el uso de la tierra tiene un impacto evidente sobre la cobertura vegetal, aunque no se traduce en cambios consistentes en el ambiente local de descomposición. Específicamente, encontramos que el incremento en la intensidad de uso se asoció a la disminución de la cobertura vegetal, de la altura de esa cobertura y de la cantidad de broza depositada sobre el suelo. Estas modificaciones estuvieron vinculadas a una disminución del contenido total de C y N en el suelo. Sin embargo, los cambios en la estructura de la vegetación no se relacionaron con los cambios en las condiciones ambientales locales (temperatura y humedad), pese a que se detectaron diferencias en esas variables ambientales entre las distintas configuraciones vegetales. Por su parte, la descomposición fue mayor en aquellos sitios con menor cobertura vegetal, que a su vez, presentaron menor temperatura del aire. Estos resultados sugieren que el cambio en el uso de la tierra tiene un impacto muy evidente sobre la cobertura de la vegetación, pero este impacto no se traduce en cambios consistentes en el ambiente local de descomposición. En estudios futuros será interesante evaluar la contribución de los procesos de degradación abiótica (fotodegradación y fragmentación física) sobre la descomposición y el ciclado de nutrientes.[Palabras clave: controles de descomposición, materiales comunes, carbono, configuraciones vegetales, estructura de la vegetación, clima local] A��. Land use and local decomposition environment in the Semiarid Chaco of Córdoba, Argentina.Land use change is a key process due to its direct effects on the identity and structure of vegetation. In semiarid Argentinean Chaco, there is scarse information about the consequences of vegetation changes on processes related to nutrient cycling (e.g., decomposition). In this work, we analyse if changes in local climatic conditions due to changes in vegetation structure, related to different land use types, affect decomposition pa�ern of two common materials. We found that land use change has a clear impact on vegetation cover, but this impact is not reflected into a consistent change in local decomposition environment. Specifically, we found that more intensive land use types were related to a decrease in vegetation cover and height and also to less li�er quantity. These changes were associated with lower soil C and N. However, changes in vegetatio...

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Section: D��unclassified

Uso de la tierra y ambiente local de descomposición en el Chaco Semiárido de Córdoba, Argentina

et al. 2017

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“…The difference is likely a result of moderation from the canopy [50,74]. Hanes and Schwartz found that as canopy vegetation becomes increasingly dense during spring leaf out, MODIS LST values begin to approach air temperatures at 1.5 m above ground.…”

Section: Discussionmentioning

confidence: 99%

Estimating Understory Temperatures Using MODIS LST in Mixed Cordilleran Forests

et al. 2016

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Abstract:Satellite remote sensing provides a rapid and broad-scale means for monitoring vegetation phenology and its relationship with fluctuations in air temperature. Investigating the response of plant communities to climate change is needed to gain insight into the potentially detrimental effects on ecosystem processes. While many studies have used satellite-derived land surface temperature (LST) as a proxy for air temperature, few studies have attempted to create and validate models of forest understory temperature (T ust ), as it is obscured from these space-borne observations. This study worked to predict instantaneous values of T ust using daily Moderate Resolution Imaging Spectroradiometer (MODIS) LST data over a 99,000 km 2 study area located in the Rocky Mountains of western Alberta, Canada. Specifically, we aimed to identify the forest characteristics that improve estimates of T ust over using LST alone. Our top model predicted T ust to within a mean absolute error (MAE) of 1.4 • C with an overall model fit of R 2 = 0.89 over two growing seasons. Canopy closure and the LiDAR-derived standard deviation of canopy height metric were found to significantly improve estimations of T ust over MODIS LST alone. These findings demonstrate that canopy structure and forest stand-type function to differentiate understory air temperatures from ambient canopy temperature as seen by the sensor overhead.

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“…The SHAW model is a one‐dimensional hydrological model, which was originally designed to simulate soil freezing and thawing (Flerchinger and Saxton, ,; Flerchinger et al ., ). Plant components were later added to estimate the heat and water movement through a multiple‐species canopy (Flerchinger and Pierson, ; Flerchinger et al ., ) and modified to accurately simulate forest water dynamics (Link et al ., ; Flerchinger et al ., ). SHAW now simulates the transfer of heat, liquid water, and water vapour through a plant–snow–residue–soil system.…”

Section: Methodsmentioning

confidence: 99%

Simulated water budget of a small forested watershed in the continental/maritime hydroclimatic region of the United States

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Link

Hudak

et al. 2016

Hydrological Processes

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Annual streamflows have decreased across mountain watersheds in the Pacific Northwest of the United States over the last ~70 years; however, in some watersheds, observed annual flows have increased. Physically based models are useful tools to reveal the combined effects of climate and vegetation on long‐term water balances by explicitly simulating the internal watershed hydrological fluxes that affect discharge. We used the physically based Simultaneous Heat and Water (SHAW) model to simulate the inter‐annual hydrological dynamics of a 4 km2 watershed in northern Idaho. The model simulates seasonal and annual water balance components including evaporation, transpiration, storage changes, deep drainage, and trends in streamflow. Independent measurements were used to parameterize the model, including forest transpiration, stomatal feedback to vapour pressure, forest properties (height, leaf area index, and biomass), soil properties, soil moisture, snow depth, and snow water equivalent. No calibrations were applied to fit the simulated streamflow to observations. The model reasonably simulated the annual runoff variations during the evaluation period from water year 2004 to 2009, which verified the ability of SHAW to simulate the water budget in this small watershed. The simulations indicated that inter‐annual variations in streamflow were driven by variations in precipitation and soil water storage. One key parameterization issue was leaf area index, which strongly influenced interception across the catchment. This approach appears promising to help elucidate the mechanisms responsible for hydrological trends and variations resulting from climate and vegetation changes on small watersheds in the region. Copyright © 2015 John Wiley & Sons, Ltd.

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Modeling temperature and humidity profiles within forest canopies

Cited by 28 publications

References 38 publications

Uso de la tierra y ambiente local de descomposición en el Chaco Semiárido de Córdoba, Argentina

Uso de la tierra y ambiente local de descomposición en el Chaco Semiárido de Córdoba, Argentina

Estimating Understory Temperatures Using MODIS LST in Mixed Cordilleran Forests

Simulated water budget of a small forested watershed in the continental/maritime hydroclimatic region of the United States

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