Rethinking landscape-level flux estimates

Rethinking landscape-level flux estimates

Insights into landscape-level C flux Landscape-level carbon fluxes and their connectivity between the aquatic and terrestrial realm are important to quantify at large scales in order to be able to understand the effects climate and land use changes have on carbon cycling. Terrestrial, marine and peatland carbon cycling have all been well studied, while standing […]

Resilience of soil respiration to plant stress

Resilience of soil respiration to plant stress

Strong resilience of soil respiration as shown in two different studies by Barba et al. (2016) and Egan et al. (2011) in response to stress. With shifting regional and global climates, understanding the response of ecosystems to drought-induced stress is becoming increasingly critical. A paper published by Barba et al. (2016) in Oecologia yielded some […]

Seasonal lags and biophysical insights into soil CO2 efflux

Seasonal lags and biophysical insights into soil CO<sub>2</sub> efflux

Soil respiration is responsible for up to 90% of terrestrial ecosystem CO2 emissions to the atmosphere — yet the complex nature of the soil system means that soil respiration is one of the most poorly understood ecological processes. In order to better understand the drivers of soil respiration, Vargas et al. assembled a unique data […]

Opportunistic study of soil respiration in the wake of Hurricane Wilma, in a seasonally dry tropical forest

Opportunistic study of soil respiration in the wake of Hurricane Wilma, in a seasonally dry tropical forest

Initially setting out to study diurnal changes in soil CO2 concentrations in relation to soil temperature, Hurricane Wilma gave Vargas & Allen (2008) a very unique and unexpected opportunity to study how canopy recovery influences soil respiration and temperature after a large disturbance. The study site was a Seasonally Dry Tropical Forest (SDTF), on the […]

Belowground carbon dynamics: root and rhizomorph respiration!

Belowground carbon dynamics: root and rhizomorph respiration!

Plants use their fine roots and rhizomorphs for transporting nutrients and water at the soil-root interface. Rhizomorphs are strand-like entities made of fungal hyphae that grow on fine roots of plants. Together, the fine roots and rhizomorphs account for a large percentage of annual net primary productivity, however the mystery lies behind their respiration processes. […]

The multifaceted measurement of soil respiration

The multifaceted measurement of soil respiration

  Carbon sink or carbon source? Barron-Gafford et al. (2011) sought out to answer this question by measuring carbon dioxide fluxes in three different microhabitats (mesquites, bunchgrasses, and intercanopy soils) in Arizona (US), using solid state CO2 sensors. The study site is an area that is experiencing “woody encroachment”, where woody plants (e.g. mesquites) start […]

Cold desert biological soil crust community influences soil CO2 exchange

Cold desert biological soil crust community influences soil CO<sub>2</sub0> exchange

Cold deserts, like the Colorado Plateau, US are the understudied relatives of warm deserts (eg. Sonora desert, US) with respect to their carbon cycling dynamics. Most of the rain pulse events measured in the Canyonlands region (Colorado Plateau) were smaller than 5 mm. The biological soil crust (biocrusts) are an important community in these deserts, […]

From roots to shoots: the previously untapped CO2 transport system

From roots to shoots: the previously untapped CO<sub>2</sub> transport system

Forests represent the majority of terrestrial primary productivity, and therefore play an important role in global carbon budgets, however not much is known about internal carbon dioxide (CO2) efflux, from the tree roots through the xylem to the foliage. Researchers in Georgia (US) studied an experimental Populus deltoides plantation to determine how much CO2 is […]

Carbon export in boreal streams and catchment basins

Carbon export in boreal streams and catchment basins

Assessing carbon dioxide transport at the terrestrial-aquatic interface of the Krycklan catchment in north-west Sweden Northern latitude catchment basins are known to be important net sinks of carbon that vary greatly in space and time with respect to their carbon uptake. Leith et al. (2015) used high-frequency continuous non-dispersive infrared (NDIR) sensor measurements to look at […]