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Issuesland coverLandLibrary Resource
There are 2, 240 content items of different types and languages related to land cover on the Land Portal.
Displaying 373 - 384 of 2218

Behavioural context of multi-scale species distribution models assessed by radio-tracking

Journal Articles & Books
December, 2012

Incorporating ecological processes and animal behaviour into Species Distribution Models (SDMs) is difficult. In species with a central resting or breeding place, there can be conflict between the environmental requirements of the ‘central place’ and foraging habitat. We apply a multi-scale SDM to examine habitat trade-offs between the central place, roost sites, and foraging habitat in Myotis nattereri. We validate these derived associations using habitat selection from behavioural observations of radio-tracked bats.

Changes of landscape spatial structure as a result of transformation of land-ownership

Conference Papers & Reports
December, 2013
Latvia
Lithuania

The aim of the research is to analyse the landscape structure changes from the end of the Soviet times in 1974–1986 until 2005 when market economy existed in Lithuania. The changes of landscape structure were observed in 100 sample areas (squares) each of them having 2.5 km2 area and distributed in different landscape types. The changes in sample areas (squares) with determination of land cover structure transformations were observed using topographic photos and ortophoto images at a scale 1:10 000.

Effects of stream map resolution on measures of riparian buffer distribution and nutrient retention potential

Journal Articles & Books
December, 2007

Riparian ecosystems are interfaces between aquatic and terrestrial environments recognized for their nutrient interception potential in agricultural landscapes. Stream network maps from a broad range of map resolutions have been employed in watershed studies of riparian areas. However, map resolution may affect important attributes of riparian buffers, such as the connectivity between source lands and small stream channels missing in coarse resolution maps.

Evaluating landslide hazards using RCP 4.5 and 8.5 scenarios

Journal Articles & Books
December, 2015
Republic of Korea

Recently, extreme meteorological events have occurred frequently owing to climate change and its influence. Impacts of concentrated precipitation events include the damage caused by landslides. Many areas in Gangwondo (Korea) are located at high elevation and have large elevation differences; these areas are thus at high risk of landslides. The purpose of this study was to evaluate the landslide hazard of the province using representative concentration pathways (RCP) scenarios 4.5 and 8.5 and to compare results.

Habitat connectivity shapes urban arthropod communities: the key role of green roofs

Journal Articles & Books
December, 2014
Switzerland

The installation of green roofs, defined here as rooftops with a shallow soil cover and extensive vegetation, has been proposed as a possible measure to mitigate the loss of green space caused by the steady growth of cities. However, the effectiveness of green roofs in supporting arthropod communities, and the extent to which they facilitate connectivity of these communities within the urban environment is currently largely unknown.

Trophic assessment of streams in Uruguay: A Trophic State Index for Benthic Invertebrates (TSI-BI)

Journal Articles & Books
December, 2011
Uruguay

Human activities are radically changing natural land cover and increasing the delivery of soil, organic compounds, nutrients, toxic agrochemicals and other contaminants to aquatic ecosystems. The eutrophication of streams, rivers, lakes, reservoirs and costal zones is one of the most important consequences of human activities. In this study we assessed the trophic status of 28 wadeable stream reaches of the Santa Lucía basin, an important economic region of Uruguay. We developed a Trophic State Index of Benthic Invertebrates (TSI-BI), the first of its kind for South American lotic systems.

impact of human pressure on landscape patterns and plant species richness in Mediterranean coastal dunes

Journal Articles & Books
December, 2016
Italy

We analyze the spatial patterns of natural dune cover patches and their plant richness, comparing coastal sites with different levels of human pressure in central Italy. We created a detailed land cover map of dune sites. The spatial pattern of natural dune cover types was characterized by computing a set of patch-based metrics. To quantify patch plant richness, we used 16 m ² vegetation plots, randomly distributed on coastal dune cover types. For each patch, the richness of the entire pool of species and of three guilds (i.e., typical dune, ruderal, and alien species) was considered.

Land use changes on the slopes of Mount Elgon and the implications for the occurrence of landslides

Journal Articles & Books
December, 2012

A reconstruction of land use changes and the implications thereof for landslide occurrence on critical slopes of Mount Elgon in Eastern Uganda were undertaken. Aerial photographs taken in 1960 formed the benchmark for the analysis of respective land use changes between 1995 and 2006, using 30m Landsat TM and 20m SPOT MS images. Landslide sites were mapped using a MobileMapper, and terrain parameters were derived using a 15m Digital Elevation Model.

Limited potential for terrestrial carbon sequestration to offset fossil‐fuel emissions in the upper midwestern US

Journal Articles & Books
December, 2010

Many carbon dioxide (CO₂) emission‐reduction strategies currently under consideration rely on terrestrial carbon (C) sequestration to offset substantial proportions of CO₂ emissions. We estimated C sequestration rates and potential land areas for a diverse array of land‐cover changes in the Upper Midwest of the US, a “best case” region for this study because of its relatively modest CO₂ emissions and the large areas of cropland potentially available for conversion.

Multiple DPSI frameworks for support of integrated research: a case study of the Bahía de Cádiz Nature Park (Spain)

Journal Articles & Books
December, 2015
Spain

System thinking and integrated research are widely applied approaches in environmental management, often facilitating the organization of information from different levels and sources. They are here applied to support the review of (1) political and management instruments and (2) elements that characterize the Bahia de Cádiz Nature Park (Spain). The latter objective is sustained by the DPSIR (Driver-Pressure-State-Impact-Response) framework. A first DPSI conceptual map offers a broader view of the park capturing a range of elements that act at global, national and regional levels.

Comparison of vegetation water contents derived from shortwave-infrared and passive-microwave sensors over central Iowa

Journal Articles & Books
December, 2011

Retrieval of soil moisture content using the vertical and horizontal polarizations of multiple frequency bands on microwave sensors can provide an estimate of vegetation water content (VWC). Another approach is to use foliar-water indices based on the absorption at shortwave-infrared wavelengths by liquid water in the leaves to determine canopy water content, which is then related to VWC.