Global ETD Search
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Showing 1 to 13 of 13 for “"heterotrophic respiration"”.
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Environmental And Stand Variables Influencing Soil CO2 Efflux Across The Managed Range Of Loblolly Pine
… (Rs) and a component of that total efflux, heterotrophic respiration index (Rh), from data collected across the managed range of loblolly pine in the Southeastern U.S. We also performed tests of significance on controlled subsets of these data for the effects of fertilization and of …
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Relationships Among Soil Properties and Soil CO2 Efflux in a Loblolly Pine-Switchgrass Intercropped System
… consumed by microbial community, increasing heterotrophic respiration and as a result overall total CO2 efflux. The amount and distribution of labile C controls microbial community dynamics, heterotrophic respiration as well as the stabilization of soil C.
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Soil Respiration and Decomposition Dynamics of Loblolly Pine (Pinus taeda L.) Plantations in the Virginia Piedmont
… autotrophic (RA) and microbially-derived heterotrophic (RH) soil respiration in response to management and climate change is important, as environmental and ecological factors often differentially affect these components, and RH can be weighed against net primary productivity (NPP) to …
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Variabilité de la respiration hétérotrophe du sol dans des écosystèmes agricoles: Analyse à différentes échelles spatiales et temporelles.
Soil heterotrophic respiration (HR) was studied at different spatial and temporal scales in agricultural ecosystems in Belgium (loamy region). Results from both laboratory and field experiments conducted at short and long timescales were analysed with the aim to better understand the influence of …
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Spatial inconsistencies influence global estimates of soil respiration: how can we improve global predictions?
Soil respiration (Rs), the efflux of CO2 from soils to the atmosphere, is a major component of the terrestrial carbon cycle, but is poorly constrained from regional-to-global scales. The global soil respiration database (SRDB) is a compilation of in-situ Rs observations from around the globe that …
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The tropical peatland carbon sink: climatic drivers and modelling of peat accumulation at the pan-tropical scale
… peatlands. Carbon decomposition via soil heterotrophic respiration to CO2 (SHR-CO2) shows a sharp decrease under anoxic water-saturated conditions, with a mean ratio of SHR-CO2 under anoxic conditions and SHR-CO2 at the optimum moisture of 0.10 ± 0.08. The median value of Q10 for peat …
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Description et analyse d'un modèle de respiration hétérotrophe appliqué à un sol agricole.
… aimed to describe a mechanistic model for soil heterotrophic respiration, to apply it to an agricultural soil and to specify its important parameters, in order to define future research fields. A complete description of the model structure is given. It uses a daily time step and is derived from …
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Non-growing season CO2 fluxes of a boreal fen – key drivers and responses to anomalous winter conditions
… source of CO2, 2018 and 2016. In 2016, a strong respiration release during the winter-spring transition period turned the annual balance of CO2 to positive, resulting in the highest emission of CO2 during the entire study period. The period of anomalous respiration alone offset 38% of the …
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Quantification and Physiology of Carbon Dynamics in Intensively Managed Loblolly Pine (Pinus taeda L.)
… effects of fertilization on autotrophic, heterotrophic, and soil respiration. Major results from the study include the finding that fertilization caused a transient rise in photosynthetic capacity, which paralleled changes in foliar nitrogen. Leaf area accumulation and enhanced growth …
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Wood and soil-atmosphere carbon dioxide fluxes from a tropical forest ecosystem
… was 1780 g C m-2 yr-1. Assuming that root and heterotrophic respiration each contribute about 50% of soil CO 2 efflux, then approximately 890g C m-2 yr-1 derive from each source. The estimated gross primary photosynthesis for the TNF is 3000 g C m-2 yr-1 (Miller et al., 2004). Therefore, …
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The Short-term Effects of Fertilization on Total Soil CO2 Efflux, Heterotrophic, and Autotrophic Respiration of Loblolly Pine (Pinus taeda L.)
… we began monitoring total soil CO2 efflux (EC), heterotrophic (RH), and root respiration (RR) in response to fertilization with diammonium phosphate (DAP). Respiratory components were measured prior to fertilization, weekly following fertilization, and bi-weekly after respiratory components …
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Quantifying biophysical and biogeochemical influence on northern high latitudes greenhouse gases dynamics
… processes using the site and regional level heterotrophic respiration, SOC stocks and soil Δ14C profiles, the vertically-resolved soil biogeochemistry version of the model (ISAM-1D) estimated permafrost SOC turnover time of 1443 years, which is about three times more than the estimation based …
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The potential implications of bioenergy crop production for water and energy balance and carbon and nitrogen dynamics in the United States
… carbon stock in root and rhizome, soil respiration, NEE and N2O emission with the growth of bioenergy grasses are well evaluated with observational data, indicating that the model is basically able to capture multiyear variability in belowground carbon stock in root and rhizome, …