Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 17 of 17 for “"soil CO2 efflux"”.
-
Relationships Among Soil Properties and Soil CO2 Efflux in a Loblolly Pine-Switchgrass Intercropped System
The components of soil CO2 efflux are affected by many soil properties including temperature, moisture, microbial abundance and activity, and other soil physical and chemical properties. Changes in these factors can result in high spatial and temporal variability of total soil CO2 efflux. Low …
-
Environmental And Stand Variables Influencing Soil CO2 Efflux Across The Managed Range Of Loblolly Pine
… models of the output of carbon from the soil in the form of soil CO2 efflux (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 …
-
Soil Co2 Efflux and Soil Carbon Content as Influenced by Thinning in Loblolly Pine Plantations on the Piedmont of Virginia
… of thinning on aboveground carbon and mineral soil carbon storage, 14-years after the thinning of an 8-year-old loblolly pine plantation on the piedmont of Virginia. The study also examined soil respiration for one year following the second thinning of the same stand at age twenty-two. The …
-
The Short-term Effects of Fertilization on Total Soil CO2 Efflux, Heterotrophic, and Autotrophic Respiration of Loblolly Pine (Pinus taeda L.)
… affects the below-ground processes that drive soil CO2 efflux in loblolly pine (Pinus taeda L.). A thorough understanding of below-ground carbon dynamics is necessary for the estimation of net ecosystem productivity and the carbon storage potential of these managed systems. In April 2004, we …
-
Quantification and Physiology of Carbon Dynamics in Intensively Managed Loblolly Pine (Pinus taeda L.)
… study included (1) investigating environmental, soil C, root, and stand influences on soil CO2 efflux on the South Carolina coastal plain and (2) quantifying soil CO2 efflux over a rotation in loblolly pine stands located on the South Carolina coastal plain and the Virginia piedmont. In relation …
-
Soil Carbon Dioxide Efflux in a Naturally Regenerated and a Planted Clear-Cut on the Virginia Piedmont
Soils are a major component of the global carbon budget and may serve an important role in mitigating increasing atmospheric CO2 through their capacity to store carbon. In this regard, it is important to evaluate the implications of forest management on changes in carbon cycling and sequestration …
-
The influence of leaf litter and plants on soil respiration before, during and after a severe drought
… importance of drought events, their effect on soil carbon dynamics are less well understood. The above-below ground linkages that affect soil dynamics in forested areas during drought and immediately after rewetting can have a substantial impact on how soil carbon is stored. Soil respiration …
-
Soil respiration, microbial respiration and mineralisation in soils of montane rainforests of Southern Ecuador: influence of altitude
… occupy about 20 % of all tropical forests. Soils of tropical montane forests are frequently waterlogged and characterised by high soil organic carbon stocks. Furthermore, along altitudinal gradients, changes in stand structure and net primary production can be observed that have not been …
-
Tree functional diversity affects litter decomposition and arthropod community composition in a tropical forest
… communities on litter decomposition and soil carbon dynamics in a semi-deciduous lowland tropical forest in Panama. I used size-based arthropod exclusions and different litter mixtures in experimental mesocosms in a 60-year-old secondary forest to assess changes in soil respiration and …
-
Long-Term (24-Year) Effects of Harvest Disturbances on Ecosystem Productivity and Carbon Sequestration in Tupelo-Cypress Swamps in the Mobile-Tensaw River Delta
… plant biomass, belowground woody debris, soil C, and soil CO2 efflux were measured. Twenty-four years after treatments were applied, forest C levels were higher in SKID treatments (206.1 Mg C ha-1) than in HELI treatments (168.7 Mg C ha-1). GLYPH treatments are holding less (144.2 Mg C …
-
Impacts of mountain pine beetle outbreak on biogeochemical cycling in a high elevation whitebark pine ecosystem
… than those under unattacked trees. In response, soil NH4+ concentrations in the organic horizons increased from 15 µg N/g soil under unattacked trees to 33 µg N/g soil under attacked trees. However, there were not significant differences in ammonium (NH4+) concentrations in the mineral soil …
-
Impacts of mountain pine beetle outbreak on biogeochemical cycling in a high elevation whitebark pine ecosystem
… than those under unattacked trees. In response, soil NH4+ concentrations in the organic horizons increased from 15 µg N/g soil under unattacked trees to 33 µg N/g soil under attacked trees. However, there were not significant differences in ammonium (NH4+) concentrations in the mineral soil …
-
The Influence of Selection Silviculture Biomass Harvesting on Soil Carbon, Nutrients, and Respiration in a Northern Mixed-Deciduous Forest
Concerns have been raised about soil fertility following increased recovery of biomass in northern mixed deciduous forests. Several studies suggest that biomass extraction and enhanced decomposer activity can lead to losses of soil C and nutrients, increased nitrification, and reduced soil CO2 …
-
The effect of bush clearing on soil respiration in north-central Namibia: Cheetah conservation fund and Erichsfelde
Changes in vegetation or land use that affects soil respiration are a major concern for global climate change. Bush clearing in north-central Namibia has been used as a solution to problems of bush encroachment. However, the effect of bush clearing on soil processes, such as the carbon cycle and …
-
Forest respiration from eddy covariance and chamber measurements under high turbulence and a bark beetle epidemic
… R were developed from periodic foliage, wood and soil CO2 efflux measurements fit to models of phenological seasonal change and diurnal temperature response. These models estimated ecosystem mean nightly respiration to have declined 32% after the bark beetle epidemic (7.0 ±0.22 μmol m-2 s-1 in …
-
Simulated Emerald Ash Borer Induced Changes in Western New York Forests
… microclimate was also determined by quantifying soil organic matter, decay rate, soil respiration, tree productivity, soil and air temperature, and soil moisture. Ash was prevalent in all three woody strata (seedlings, saplings, and trees) at the examined sites; however, once these sites are …
-
Factors controlling microbial biomass in soils of Mt. Kilimanjaro
… contents of organic matter and microorganisms in soils are sensitive parameters to evaluate soil quality. In general, high contents in organic and microbial carbon (Corg, Cmic) are related to high soil fertility. Especially in the tropics, climate and land use have strong direct effects on basic …