We used 135 permanent plots (4 m2) nested within 15 blocks (121 m2) to quantify changes in concentration and spatial variation of carbon (C) and nitrogen (N) in the mineral soil (0- to 10-cm depth) after logging and broadcast burning of an old-growth, Douglas-fir (Pseudotsuga menziesii (…
Keywords: Broadcast burning, soil carbon, soil nitrogen, soil variability, coast Douglas-fir, clearcutting
Source: Res. Pap. PNW-RP-552. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 19 p
This report documents trends and impacts of climate change on America's forests as required by the Renewable Resources Planning Act of 1974. Recent research on the impact of climate and elevated atmospheric carbon dioxide on plant productivity is synthesized. Modeling analyses explore the potential…
Keywords: forest productivity, vegetation change, carbon sequestration, mitigation, forest sector, timber inventory, soil carbon, carbon accounting, afforestation, deforestation
Source: Gen. Tech. Rep. RMRS-GTR-59. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 133 p.
We used a spatially nested hierarchy of field and remote-sensing observations and a process model, Biome-BGC, to produce a carbon budget for the forested region of Oregon, and to determine the relative influence of differences in climate and disturbance among the ecoregions on carbon stocks and…
Keywords: carbon balance, carbon flux, respiration, net primary production, carbon stocks, soil carbon, carbon allocation, conifer forests
Source: Global Change Biology. 10: 1429-1444
This paper reviews the role of soil respiration in determining ecosystem carbon balance, and the conceptual basis for measuring and modeling soil respiration. We developed it to provide background and context for this special issue on soil respiration and to synthesize the presentations and…
Keywords: belowground carbon allocation, carbon cycling, carbon dioxide, CO2, Infrared gas analyzers, methods, soil carbon, terrestrial ecosystems
Source: Biogeochemistry. 73: 3-27.
Nutrient supply commonly limits aboveground plant productivity in forests, but the effects of an altered nutrient supply on gross primary production (GPP) and patterns of carbon (C) allocation remain poorly characterized. Increased nutrient supply may lead to a higher aboveground net primary…
Keywords: Aboveground net primary production, carbon budget, ecosystem respiration, gross primary production, leaf respiration, litterfall, soil carbon, soil respiration, total belowground carbon allocation, wood respiration
Source: Primary production and carbon allocation in relation to nutrient supply in a tropical experimental forest. 2003. In Global Change Biology (2003) 9, 1438-1450.
Nitrogen (N) availability influences carbon (C) storage in forest soils through effects on plant growth, litter production, and soil C decomposition and stabilization. Soil C/N and net N-mineralization are commonly reported empirical measures of soil N availability, and changes in these variables…
Keywords: north temperate forest, nitrogen inputs, soil carbon, soil nitrogen, meta-analysis
Source: Geoderma. 153: 231-240.
Forest soil carbon (C) storage is a significant component of the global C cycle, and is important for sustaining forest productivity. Although forest management may have substantial impacts on soil C storage, experimental data from forest harvesting studies have not been synthesized recently. To…
Keywords: forest management, harvest, site preparation, soil carbon, soil order, meta-analysis
Source: Forest Ecology and Management. 259: 857-866.
Belowground C and N storage is important in maintaining forest productivity and to CO2 sequestration. How these pools respond to management is poorly understood. We investigated effects of repeated applications of complete fertilizer and competing vegetation control with herbicides on C and N…
Keywords: silviculture, soil carbon, soil nitrogen
Source: Soil Science Society of American Journal, 73: 1020-1032
Soil carbon contents were measured on a short-rotation woody crop study located on the US Department of Energy's Savannah River Site outside Aiken, SC. This study included fertilization and irrigation treatments on five tree genotypes (sweetgum, loblolly pine, sycamore and two eastern cottonwood…
Keywords: short-rotation woody crops, soil carbon, stabilized carbon, irrigation, fertilization
Source: Biomass and Bioenergy 31:793–801
Soils are fundamental to a healthy and functioning ecosystem. Therefore, forest land managers can greatly benefit from a more thorough understanding of the ecological impacts of fire and fuel management activities on the vital services soils provide. We present a summary of new research on fire…
Keywords: Soils, fire effects, prescribed fire, wildfire, soil carbon, soil organisms, water repellency, nutrients, forest restoration
Source: Gen. Tech. Rep. PNW-GTR-759. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 17 p.