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Keyword: soil

Advective transport of CO2 in permeable media induced by atmospheric pressure fluctuations: 1. An analytical model

Publications Posted on: October 17, 2006
Advective flows within soils and snowpacks caused by pressure fluctuations at the upper surface of either medium can significantly influence the exchange rate of many trace gases from the underlying substrate to the atmosphere.

Effects of fire interval restoration on carbon and nitrogen in sedimentary- and volcanic-derived soils of the Mogollon Rim, Arizona

Publications Posted on: July 27, 2006
Prescribed fire was returned into over-stocked ponderosa pine stands on the Mogollon Rim of Arizona for the purpose of restoring fire into the ecosystem and removing fuel buildups. Prescribed fires have been ignited at intervals of 1, 2, 4, 6, 8, and 10 years to determine the best fire return interval for Southwest ponderosa pine ecosystems.

Soil carbon in arid and semiarid forest ecosystems [Chapter 18]

Publications Posted on: July 27, 2006
Forests of the semiarid and arid zones of the interior western United States (US) are some of the most unique in North America. They occupy 11 to 34% of the landscape at mostly higher elevations (USDA Forest Service, 1981). These forests are characterized by a high diversity of flora, fauna, climates, elevations, soils, geology, hydrology, and productivity.

Impacts of natural disturbance on soil carbon dynamics in forest ecosystems

Publications Posted on: July 27, 2006
Forest soils are entities within themselves, self-organized and highly resilient over time. The transfer of energy bound in carbon (C) molecules drives the organization and functions of this biological system (Fisher and Binkley, 2000; Paul and Clark, 1996). Photosynthetic organisms reduce atmospheric C and store energy from solar radiation in the formation of complex C molecules.

Spatial and temporal patterns in erosion from forest roads

Publications Posted on: July 24, 2006
Erosion from forest roads is an important contribution to the sediment budget of many forested basins, particularly over short time scales. Sediment production from 74 road segments was measured over three years to examine how road slope, segment length, cutslope height, and soil texture affect sediment production and how these relationships change with time.

Simplified methods for evaluating road prism stability

Publications Posted on: June 21, 2006
Mass failure is one of the most common failures of low-volume roads in mountainous terrain. Current methods for evaluating stability of these roads require a geotechnical specialist. A stability analysis program, XSTABL, was used to estimate the stability of 3,696 combinations of road geometry, soil, and groundwater conditions.

Field validation of Burned Area Reflectance Classification (BARC) products for post fire assessment

Publications Posted on: June 21, 2006
The USFS Remote Sensing Applications Center (RSAC) and the USGS EROS Data Center (EDC) produce Burned Area Reflectance Classification (BARC) maps for use by Burned Area Emergency Rehabilitation (BAER) teams in rapid response to wildfires. BAER teams desire maps indicative of soil burn severity, but photosynthetic and nonphotosynthetic vegetation also influences the spectral properties of post-fire imagery.

Defining boundaries across borders: a case study extending a major land resource area into Mexico

Publications Posted on: June 13, 2006
Geographic information science (GIS) and field work were applied to extend Major Land Resource Area (MLRA) 41, Southeastern Arizona Basin and Range, from Arizona and New Mexico into Sonora and Chihuahua, Mexico. The result of this analysis is a tentative boundary line that delineates MLRA 41 for both the United States and Mexico based on elevation, soils, temperature, precipitation, and vegetation.

Assessing indicators of rangeland health with remote sensing in southeast Arizona

Publications Posted on: June 13, 2006
The goal of this study was to scale up ground-based range assessments to ranch and landscape scales in southeast Arizona using remote sensing and minimum amount of field data collection. Remotely sensed metrics of canopy cover, biomass, and mesquite composition were used to assess soil and site stability and biotic integrity.

Climate mitigation potential of the San Pedro River riparian zone

Publications Posted on: June 13, 2006
Carbon (C) and nitrogen (N) cycling within an open brush site, a sacaton (Sporobolus wrightii) grass and a mesquite (Prosopis velutina) grove, in the riparian zone was closely linked to the yearly litter N inputs. Yearly mesquite litter fall for 2 yr was remarkably similar and averaged 4.0 g N m-2 and 65 g C m-2 soil and resulted in higher soil C content compared to other riparian vegetation.

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