Jun 16, 2011 ... Title: Shifts in Aboveground and Forest Floor Carbon and Nitrogen Pools After Felling and Burning in the Southern Appalachians ...

Timber availability, aboveground tree biomass, and changes in aboveground carbon pools are important consequences of landscape management. There are several models available for calculating tree volume and aboveground tree biomass pools. This paper docume...

Ever more detailed representations of above-ground biomass and soil carbon pools have been developed

... C pool accumulation and to quantify changes in ecosystem carbon to nitrogen (C:N) ratios of the pools during recovery after fire. We hypothesized that biomass ... ...

... responses of the desert shrubs Artemisia tridentata and Chrysothamnus nauseosus to shallow- vs. deep-soil water in a ... ...

Changes in aboveground and forest floor mass, carbon (C), and nitrogen (N) pools were quantified on three sites in the southern Appalachians 2 yr after felling and burning. Before felling and burning, stands were characterized by sparse overstories and de...

Pinyon and juniper woodland encroachment associated with climate change and land use history in the Great Basin is thought to provide offsets for carbon emissions. However, the largest pools of carbon in arid landscapes are typically found in soils, and aboveground biomass cannot be considered long ...

Forest thickening in Western United States forests, which is characterized by an increase in stem density, may have arisen from alterations in historic fire regimes brought about by fire suppression. This has led to a shift in forest structure and demography from a comparatively sparse forest composed of a few large trees to one composed of a higher number of small trees. This study compares plots ...

A simulation study was made on the responses of biomass of Deyeuxia angustifolia and soil active carbon pool in Sanjiang Plain of Northeast China to simulated nitrogen deposition. Two water conditions (W1: non-flooded, W2: flooded) and four N treatments (equivalent to 0, 1, 3, 5 g N x m(-2) x a(-1) nitrogen deposition rate) were installed. The results ...

Comparison of methods to model aboveground biomass and derive 20+ year aboveground ... Spatially explicit knowledge of aboveground biomass dynamics at broad ...

The NASA-CASA (Carnegie Ames Stanford Approach) simulation model based on satellite observations of monthly vegetation cover from the Moderate Resolution Imaging Spectroradiometer (MODIS) was used to estimate tropical forest and savanna (Cerrado) carbon pools for the Brazilian Amazon region over the period 2000-2004. Adjustments for mean age of forest ...

Elevated CO2 generally increases soil C pools. However, greater available C concentrations can potentially stimulate soil organic matter (SOM) decomposition. The effects of climate warming on C storage can also be positive or negative. There is a high degree of uncertainty on the combined effects of climate warming and atmospheric CO2 increase on SOM dynamics and its potential ...

Atmospheric CO2 concentrations have increased in recent decades and are projected to increase even further during the coming century. These projections have prompted scientists and policy-makers to consider how plants and soils can be used to stabilize CO2 concentrations. Although storing carbon in terrestrial ecosystems represents an attractive near-term option for ...

Jun 16, 2011 ... Title: Quantifying Aboveground Carbon Storage in Managed Forest ... Proceedings, 14th Central Hardwood Forest Conference; 2004 March 16-19; ...

We studied the effects of relatively low levels of O(3) (40-50 ppb) and CO(2)-enrichment (+100 ppm) on a northern European lowland hay meadow during the summers 2002-2004 using open-top chambers (OTCs) and ground-planted mesocosms. Ozone reduced the aboveground biomass of the community (up to 40%), and four out of seven species (Campanula rotundifolia, Fragaria vesca, ...

Total ecosystem carbon storage and the fraction of ecosystem carbon in aboveground wood .... net primary production, net ecosystem exchange, soil carbon, ...

As atmospheric CO2 increases, ecosystem carbon sequestration will largely depend on how global changes in climate will alter the balance between net primary production and decomposition. The response of primary production to climatic change has been examined using well-validated mechanistic models, but the same is not true for decomposition, a primary source of atmospheric ...

We examined the effects of five agricultural management systems common in the Upper Midwest on the turnover of root carbon residue. Belowground plant material is thought to contribute significantly more to stable soil carbon pools than aboveground plant material. To track the decomposition of this important source ...

The direct effects of nitrogen deposition on nutrient availability in ecosystems have been well studied, however, little is known about the indirect effects of nitrogen deposition on insect herbivory and subsequent changes to ecosystem processes. Numerous empirical studies have demonstrated that host plant nitrogen concentration can strongly affect individual insect consumption rates and ...

Net primary productivity (NPP) is enhanced under future atmospheric [CO2] in temperate forests representing a broad range of productivity. Yet questions remain in regard to how elevated [CO2]-induced NPP enhancement may be affected by climatic variations and limiting nutrient resources, as well as how this additional production is distributed among carbon (C) ...

Net primary productivity (NPP) is enhanced under future atmospheric [CO₂] in temperate forests representing a broad range of productivity. Yet questions remain in regard to how elevated [CO₂]-induced NPP enhancement may be affected by climatic variations and limiting nutrient resources, as well as how this additional production is distributed among ...

The stock and structure of organic substances in the pine tree plantations on the overburden dumps of open-cut coal mines in Middle Siberia have been determined. It has been shown that the forming forest biogeocenoses differ from the natural phytocenoses and soils of the forest landscapes in the structure of the carbon pool and its distribution between the ...

Shrublands constitute significant and important parts of European landscapes providing a large number of important ecosystem services. Biogeochemical cycles in these ecosystems have gained little attention relative to forests and grassland systems, but data on such cycles are required for developing and testing ecosystem models. As climate change progresses, the potential feedback from terrestrial ...

...pools that is not fastened to the pool deck or the ground. This slide may have attachments to the aboveground pool to prevent misalignment. (13) Friction means the force tending to reduce the velocity of the slider on the slide. (14) [Reserved]...

...pools that is not fastened to the pool deck or the ground. This slide may have attachments to the aboveground pool to prevent misalignment. (13) Friction means the force tending to reduce the velocity of the slider on the slide. (14)...

Jun 16, 2011 ... Description: Accurate estimates of forest aboveground biomass are needed to reduce uncertainties in global and regional terrestrial carbon ...

Comparison of methods to model aboveground biomass and derive 20+ year aboveground biomass trajectories. Scott L Powell, USDA Forest Service, ...

The allocation of recently assimilated C to below- vs. aboveground plant components and the time this C remains inside the ecosystem are the key uncertainties in global terrestrial C models. Recent studies reported the time lag between the photosynthetic C uptake and its following respiration through the rooting systems in the magnitude from minutes to days. Studies in situ ...

Carbon Accumulation and Sequestration by Bahiagrass Systems: Effect Across Time of Nitrogen Fertility, Water, and Aboveground Biomass Removal. ...

Recently deciduous forests in northeastern Austria received increased attention as potential sources of biomass for energetic utilisation. There are still substantial deficits in the knowledge on carbon pools, -sequestration and -dynamics at these forest sites. The aim of our study was therefore to identify the main determinants which control soil organic ...

Biomass present before and after burning was measured in forest cleared for pasture in a cattle ranch (Fazenda Dimona) near Manaus, Amazonas, Brazil. Aboveground dry weight biomass loading averaged 265 t ha{sup {minus}1} (standard deviation (SD) = 110, n = 6 quadrats) at Fazenda Dimonas. Postburn aboveground biomass loading was evaluated by cutting and ...