Passar para o conteúdo principal

page search

Displaying 1105 - 1116 of 1735
Journal Articles & Books
Dezembro 2012

In temperate regions, feeding livestock year round on pasture is usually limited by weather conditions and livestock must be fed hay, or other stored feeds, at least part of the year when pasture forage runs out. On many farms, hay must be fed during winter and hay feeding is typically confined…

Journal Articles & Books
Dezembro 2012

Macroinvertebrate species composition data are often expressed as proportional abundances when assessing water-quality conditions or responses to disturbance. Proportional abundances represent the probability of belonging to one of many mutually exclusive and exhaustive groups (taxa).…

Journal Articles & Books
Dezembro 2012

The structural characteristics of Light Detection and Ranging (LiDAR) data are increasingly used to classify urban environments at fine scales, but have been underutilized for distinguishing heterogeneous land covers over large urban regions due to high cost, limited spectral information, and…

Journal Articles & Books
Dezembro 2012

Moderate Resolution Imaging Spectroradiometer (MODIS) estimates of gross primary production (GPP) were validated using field-based estimates of net primary production from the Forest Inventory and Analysis (FIA) Program across the eastern USA. A total of 54 969 MODIS pixels and co-located FIA…

Journal Articles & Books
Dezembro 2012

With an ever expanding population, potential climate variability and an increasing demand for agriculture-based alternative fuels, accurate agricultural land-cover classification for specific crops and their spatial distributions are becoming critical to researchers, policymakers, land managers…

Journal Articles & Books
Dezembro 2012

The paper describes an efficient approach for mapping multiple individual tree species over large spatial domains. The method integrates vegetation phenology derived from MODIS imagery and raster data describing relevant environmental parameters with extensive field plot data of tree species…

Journal Articles & Books
Dezembro 2012

This paper examined the relationship between remotely sensed anthropogenic heat discharge and energy use from residential and commercial buildings across multiple scales in the city of Indianapolis, Indiana, USA. The anthropogenic heat discharge was estimated with a remote sensing-based surface…

Journal Articles & Books
Dezembro 2012

Global climate models (GCM) investigating the effects of land cover on climate have found that replacing extra-tropical forest with cropland promotes cooling. We compared cropland and forest surface temperatures across the continental United States in 16 cells that were approximately 1°×2° using…

Journal Articles & Books
Dezembro 2012

SUMMARYThis paper analyses the differences between forestland tenure systems in Canada and the US. Evolution of the two systems is primarily explained by variation of scarcity and land productivity. In early colonial times, Canada's economy was tightly linked to the fur trade with Indian…

Journal Articles & Books
Dezembro 2012

Leading climate change experts within the international scientific community support the use of forest carbon sinks as a climate change mitigation tool. Functioning regulatory and voluntary carbon offset frameworks within the United States recognize forest offsets with varying levels of…

Journal Articles & Books
Dezembro 2012

We used simulation modeling to analyze wildfire exposure to social and ecological values on a 0.6millionha national forest in central Oregon, USA. We simulated 50,000 wildfires that replicated recent fire events in the area and generated detailed maps of burn probability (BP) and fire intensity…

Journal Articles & Books
Dezembro 2012

Pathogen contamination of waterbodies, which is often identified by the presence of pathogen indicators such as Escherichia coli, is a major water quality concern in the United States. Reducing in-stream pathogen contamination requires an understanding of the combined impacts of land cover,…