Linking Physical Geography Education and Research Through the Development of an Environmental Sensing Network and Project-Based Learning

Roberts, Dar A.; Bradley, Eliza S.; Roth, Keely L.; Eckmann, Ted C.; Still, Christopher J.

doi:10.5408/1.3559887

Cited by 19 publications

(20 citation statements)

References 16 publications

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“…This area spans an elevation range from sea level to 1300 m, with coastal sage scrub and grassland communities dominating at lower coastal elevations, oak forest, and chaparral shrublands at higher elevation, riparian forest in mountain drainages, and oak savanna, coastal sage scrub, and grassland in drier inland areas. Precipitation and soil moisture data collected from a station in the study area [35] demonstrate reduced monthly precipitation and decreasing soil volumetric moisture content (VMC) since the last winter with above average precipitation, 2010-2011 ( Figure 2). …”

Section: Study Areamentioning

confidence: 99%

Monitoring the Impacts of Severe Drought on Southern California Chaparral Species using Hyperspectral and Thermal Infrared Imagery

et al. 2015

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Airborne hyperspectral and thermal infrared imagery acquired in 2013 and 2014, the second and third years of a severe drought in California, were used to assess drought impacts on dominant plant species. A relative green vegetation fraction (RGVF) calculated from 2013-2014 Airborne Visible Infrared Imaging Spectrometer (AVIRIS) data using linear spectral unmixing revealed seasonal and multi-year changes relative to a pre-drought 2011 reference AVIRIS image. Deeply rooted tree species and tree species found in mesic areas showed the least change in RGVF. Coastal sage scrub species demonstrated the highest seasonal variability, as well as a longer-term decline in RGVF. Ceanothus species were apparently least well-adapted to long-term drought among chaparral species, showing persistent declines in RGVF over 2013 and 2014. Declining RGVF was associated with higher land surface temperature retrieved from MODIS-ASTER Airborne Simulator (MASTER) data. Combined collection of hyperspectral and thermal infrared imagery may offer new opportunities for mapping and monitoring drought impacts on ecosystems.

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Section: Study Areamentioning

confidence: 99%

Monitoring the Impacts of Severe Drought on Southern California Chaparral Species using Hyperspectral and Thermal Infrared Imagery

et al. 2015

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“…californica and S. leucophylla (Roberts et al. ). Nearby lies a stand of B. pilularis , located 0.5 km to the southwest of the weather station and considered part of the SSI field site.…”

Section: Methodsmentioning

confidence: 99%

Fog and live fuel moisture in coastal California shrublands

2018

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Abstract. Across Mediterranean-type climate regions, seasonal drought desiccates plants, facilitating ignition and the spread of wildfires. Along the California coast, summertime fog has the potential to ameliorate drought conditions and thus reduce plant flammability during a critical time of elevated fire risk. This study investigated the uptake of dry season fog and how it affects live fuel moisture (LFM) in six dominant shrub species from chaparral and sage scrub plant associations. Fog water uptake was evaluated using stable isotopes of hydrogen and oxygen at several field sites in Santa Barbara County, California. Clear evidence of fog water uptake was identified only in Baccharis pilularis, from the sage scrub association. To determine the effects of fog on LFM, meteorological variables and indices including fog deposition were combined into principal components and the scores regressed against the LFM loss rate during the summer drought. Fog deposition slowed rates of LFM loss for all three sage scrub species tested, but it did not affect the chaparral species. Fog is a more regular occurrence in the sage scrub association, and thus, it is likely that fog ameliorates drought for species that experience consistent fog during the summer months. In coastal California, summer fog can be essential to plant water relations and reduce LFM loss rates during the summer drought. Understanding these effects is important in the context of changing climate in southern California and fire-prone regions around the world.

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“…of Artemisia californica and Salvia leucophylla (Roberts et al 2010). Nearby lies a stand of Baccharis 135 pilularis, located 0.5 km to the southwest of the weather station and considered part of the SSI field site.…”

Section: Methods 98mentioning

confidence: 99%

Fog and live fuel moisture in coastal California shrublands

Emery

D’Antonio

Still

2017

Preprint

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9Across most Mediterranean-type climate regions, seasonal drought desiccates plants, facilitating ignition 10 and the spread of wildfires. Along the California coast, summertime fog has the potential to ameliorate 11 drought conditions and thus reduce plant flammability during a critical time of elevated fire risk. This 12 study investigated the uptake of dry season fog and how it affects live fuel moisture in six dominant shrub 13 species from chaparral and sage scrub plant associations. Fog water uptake was evaluated using stable 14 isotopes of hydrogen and oxygen at several field sites in Santa Barbara County, California. Clear 15 evidence of fog water uptake was identified only in Baccharis pilularis, from the sage scrub association. 16To determine the effects of fog on live fuel moisture, meteorological variables and indices including fog 17 deposition were combined into principal components and the scores regressed against the live fuel 18 moisture loss rate during the summer drought. Fog deposition slowed rates of live fuel moisture loss for 19all three sage scrub species tested, but it did not affect the chaparral species. Fog is a more regular 20 occurrence in the sage scrub association and thus it is likely that fog ameliorates drought for species that 21 experience consistent fog during the summer months. In coastal California, summer fog can be essential 22 to plant water relations and reduce live fuel moisture loss rates during the summer drought. 23

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Linking Physical Geography Education and Research Through the Development of an Environmental Sensing Network and Project-Based Learning

Cited by 19 publications

References 16 publications

Monitoring the Impacts of Severe Drought on Southern California Chaparral Species using Hyperspectral and Thermal Infrared Imagery

Monitoring the Impacts of Severe Drought on Southern California Chaparral Species using Hyperspectral and Thermal Infrared Imagery

Fog and live fuel moisture in coastal California shrublands

Fog and live fuel moisture in coastal California shrublands

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