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There are 9, 801 content items of different types and languages related to Utilización de la tierra on the Land Portal.
Displaying 1729 - 1740 of 4572

Modern warfare as a significant form of zoogeomorphic disturbance upon the landscape

Journal Articles & Books
Diciembre, 2012
Francia
Viet Nam

The damage exerted by warfare on the physical landscape is one, of many, anthropogenic impacts upon the environment. Bombturbation is a term that describes the impacts of explosive munitions upon the landscape. Bombturbation, like many other forms of zoogeomorphology, is a disruptive force, capable of moving large amounts of sediments, and denuding landscapes to the point where changes in micro and mesotopography have long-term implications.

cost effective stratified two-stage sampling design to estimate the forest land area of southern Chile

Journal Articles & Books
Diciembre, 2011
Chile

There is a growing demand for improving the measurement of forest resources, with more frequent updating and better information on environmental variables. We explore the cost efficiency of a stratified two-stage design using area sampling to estimate the forest plantation and native forest areas in southern Chile. Analytical expressions for the approximate mean square error of combined and separate ratio estimators are derived applying Taylor linearization.

Pollinator body size mediates the scale at which land use drives crop pollination services

Journal Articles & Books
Diciembre, 2014

Ecosystem services to agriculture, such as pollination, rely on natural areas adjacent to farmland to support organisms that provide services. Native insect pollinators depend on natural or semi‐natural land surrounding farms for nesting and alternative foraging resources. Despite interest in conserving pollinators through habitat restoration, the scale at which land use affects pollinators and thus crop pollination services is not well understood. We measured abundance of native, wild bee pollinators and the pollination services they provided to highbush blueberry Vaccinium corymbosum L.

Confronting the Food–Energy–Environment Trilemma: Global Land Use in the Long Run

Journal Articles & Books
Diciembre, 2016

Economic, agronomic, and biophysical drivers affect global land use, so all three influences need to be considered in evaluating economically optimal allocations of the world’s land resources. A dynamic, forward-looking optimization framework applied over the course of the coming century shows that although some deforestation is optimal in the near term, in the absence of climate change regulation, the desirability of further deforestation is eliminated by mid-century.

Segmented canonical discriminant analysis of in situ hyperspectral data for identifying 13 urban tree species

Journal Articles & Books
Diciembre, 2011
Estados Unidos de América

A total of 458 in situ hyperspectral data were collected from 13 urban tree species in the City of Tampa, FL, USA using a spectrometer. The 13 species include 11 broadleaf and two conifer species. Three different techniques, segmented canonical discriminant analysis (CDA), segmented principal component analysis (PCA) and segmented stepwise discriminate analysis (SDA), were applied and compared for dimension reduction and feature extraction.

Implications of land-cover types for soil erosion on semiarid mountain slopes: Towards sustainable land use in problematic landscapes

Journal Articles & Books
Diciembre, 2013
España

The impact of land-cover types on soil erosion and runoff, as well as on physico-chemical soil properties, was monitored. The study area, an agroforestry landscape was located in Sierra Nevada Mountains in south-eastern Spain. Eight land-cover types were investigated: farmland planted with olive, almond, and cereals; forest with P. halepensis and P. sylvestris; shrubland; grassland; and abandoned farmland. The erosion plots replicated twice were located on hillslopes, where erosion and runoff were measured after 22 storm events.

CropScape: A Web service based application for exploring and disseminating US conterminous geospatial cropland data products for decision support

Journal Articles & Books
Diciembre, 2012
Estados Unidos de América

The Cropland Data Layer (CDL) contains crop and other specific land cover classifications obtained using remote sensing for the conterminous United States. This raster-formatted and geo-referenced product has been widely used in such applications as disaster assessments, land cover and land use research, agricultural sustainability studies, and agricultural production decision-making. The traditional CDL data distribution channels include paper thematic maps, email data requests, CD/DVD media, and ftp bulk downloading.

Influence of hydrological regime and land cover on traits and potential export capacity of adult aquatic insects from river channels

Journal Articles & Books
Diciembre, 2016

Despite many studies highlighting the widespread occurrence and effects of resource movement between ecosystems, comparatively little is known about how anthropogenic alterations to ecosystems affect the strength, direction and importance of such fluxes. Hydrological regime and riparian land use cause well-documented changes in riverine larval invertebrate communities.

The countryside is our national treasure!

Journal Articles & Books
Marzo, 2011
Hungría

Társadalmunk gazdasági fejlődése a természeti erőforrások használatára épül. A földtulajdon és a földhasználati rendszer hatékonysága hazánkban és az EU-ban is a figyelem középpontjában áll. A birtokstruktúra és a földhasználat döntően befolyásolják a gazdálkodás eredményességét. A Kormány a Nemzeti Földalap létrehozásával gátat kíván szabni a földspekulációnak. Vidéken a föld racionális használata megkerülhetetlen. A kritikus gazdasági helyzetű térségekben a mezőgazdasági tevékenység – mint a megélhetés egyetlen forrása – felértékelődik.

Maximizing water yield with indigenous non‐forest vegetation: a New Zealand perspective

Journal Articles & Books
Diciembre, 2008
Sudáfrica
Nueva Zelandia
África austral

Provision of clean freshwater is an essential ecosystem service that is under increasing pressure worldwide from a variety of conflicting demands. Water yields differ in relation to land‐cover type. Successful resource management therefore requires accurate information on yields from alternative vegetation types to adequately address concerns regarding water production. Of particular importance are upper watersheds/catchments, regardless of where water is extracted.

Variation in the accuracy of thermal remote sensing

Journal Articles & Books
Diciembre, 2013

Thermal infrared (TIR) remote-sensing techniques have been used to estimate land surface temperatures (LSTs) and to study the relationship between land uses and LSTs. Remotely sensed thermal data provide a time-synchronized dense grid of temperature data, and there has been a growing interest on LSTs in various fields, such as urban climatology and global environmental change. It is also important for urban planning and management practices to maintain thermally efficient urban structures. This article focuses on differences between the estimated LSTs and the measured temperatures.