Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 894.
  1. Library Resource
    Articles et Livres
    décembre, 2012

    In this letter, we present the methodology and accuracy assessment of a new regional 250-m spatial resolution land cover map of insular Southeast Asia. Nearly 500 daily Moderate Resolution Imaging Spectroradiometer images (acquired 2 January–3 July 2010) were used in the production of the map. Additionally, peatland maps, elevation information and Daichi-Advanced Land Observing Satellite mosaic data were utilized in the mapping process.

  2. Library Resource
    Articles et Livres
    décembre, 2012
    Finlande

    Increasing dissolved organic carbon (DOC) concentrations in lakes, rivers and streams in northern mid latitudes have been widely reported during the last two decades, but relatively few studies have dealt with trends in DOC export. We studied the export of DOC from Finnish rivers to the Baltic Sea between 1975 and 2010, and estimated trends in DOC fluxes (both flow normalised and non-normalised). The study encompassed the whole Finnish Baltic Sea catchment area (301,000km²) covering major land use patterns in the boreal zone.

  3. Library Resource
    Articles et Livres
    décembre, 2012
    Norvège

    The landscape of many historic cities and the character of their shallow subsurface environments are defined by a legacy of interaction between anthropogenic and geological processes. Anthropogenic deposits and excavations result from processes ranging from archaeological activities to modern urban development. Hence, in heritage cities, any geological investigation should acknowledge the role of past and ongoing human activities, while any archaeological investigation should be conducted with geological processes in mind.

  4. Library Resource
    Articles et Livres
    décembre, 2012
    Zimbabwe, Afrique

    Increasing soil degradation in southern Africa and the potentially negative effects of climate change demand ?greener? solutions to reverse this trend. Conservation agriculture (CA) has been proposed as one of those solutions and field level data show marked benefits of this new cropping system. Nevertheless, the use of rotations and/or associations in CA systems is challenging at both the farm and community level. Intercropped maize (Zea mays L.) with grain legumes, cowpea and pigeonpea (Cajanus cajan L. (Millsp.)), as well as maize rotated with cowpea (Vigna unguiculata L.

  5. Library Resource
    Articles et Livres
    mars, 2012

    The article seeks to contribute to issues of institutions that constitute the historical plane on which ‘democratic development’ rests. With that idea in mind, it sheds light onto the institutional course of the Ottoman Empire through the examination of two phenomena: the social structure of the imperial subjects and the provision of public goods. The reason that these two phenomena are essential in assessing the historical trajectory of the empire lies in their particular developmental paths that intertwine and support each other.

  6. Library Resource
    Articles et Livres
    décembre, 2012
    Australie

    Across diverse ecosystems, greater climatic variability tends to increase wildfire size, particularly in Australia, where alternating wet–dry cycles increase vegetation growth, only to leave a dry overgrown landscape highly susceptible to fire spread. Aboriginal Australian hunting fires have been hypothesized to buffer such variability, mitigating mortality on small-mammal populations, which have suffered declines and extinctions in the arid zone coincident with Aboriginal depopulation.

  7. Library Resource
    Articles et Livres
    décembre, 2012

    In this research report, we examine determinants of absentee landowner participation in USDA set-aside and cost share programs. Previous research on these landowners suggests they have a high interest in conservation yet minimal involvement in government conservation programs on their land (e.g. Petrzelka et al., 2009; Roggenbuck and Kushman, 1980). Our aim is to better understand this gap in hopes of attracting absentee landowners as participants to USDA conservation programs.

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