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Resultados de la búsqueda

Mostrando ítems 1 a 9 de 1776.
  1. Library Resource

    Volume 8 Issue 12

    Publicación revisada por pares
    Diciembre, 2019
    Canadá, Europa

    Climate change may increase the importance of agriculture in the global Circumpolar North with potentially critical implications for pristine northern ecosystems and global biogeochemical cycles. With this in mind, a global online survey was conducted to understand northern agriculture and farmers’ perspective on environmental change north of 60° N.

  2. Library Resource

    Volume 9 Issue 1

    Publicación revisada por pares
    Enero, 2020
    Australia, Estados Unidos de América, Reino Unido, Alemania, China

    Land degradation is a global issue receiving much attention currently. In order to objectively reveal the research situation of land degradation, bibliometrix and biblioshiny software packages have been used to conduct data mining and quantitative analysis on research papers in the fields of land degradation during 1990–2019 (data update time was 8 April 2019) in the Web of Science core collection database. The results show that: (1) during the past 20 years, the number of papers on land degradation has increased.

  3. News
    Foto: DW/J. Beck
    3 Enero 2020
    África
    Mozambique
    África austral
    Ataques de insurgentes aterrorizam a província de Cabo Delgado há mais de dois anos. O economista moçambicano João Mosca identifica um interesse não declarado na instabilidade da região; rica em recursos minerais.
     
  4. Library Resource

    Volume 8 Issue 10

    Publicación revisada por pares
    Octubre, 2019
    México, Estados Unidos de América

    This paper presents a synopsis of the challenges and limitations presented by existing and emerging land use/land cover (LULC) digital data sets when used to analyze the extent, habitat quality, and LULC changes of the monarch (Danaus plexippus) migratory habitat across the United States of America (US) and Mexico. First, the characteristics, state of the knowledge, and issues related to this habitat are presented.

  5. Library Resource

    Volume 8 Issue 8

    Publicación revisada por pares
    Agosto, 2019
    Estados Unidos de América

    Across the United States, there has been a growing interest in local food production, which provides an alternative way to increase self-sufficiency and support greater well-being and food security at the community level. This study focused on the Northern Panhandle region of Idaho, where opportunities derived from the local food movement have emerged in several resort and college towns.

  6. Library Resource

    Volume 8 Issue 4

    Publicación revisada por pares
    Abril, 2019
    Estados Unidos de América

    The annual budget for the United States National Park Service was roughly $3 billion in 2016. This is distributed amongst 405 National Parks, 23 national scenic and historic trails, and 60 wild and scenic rivers. Entrance fees and concessions generate millions of dollars in income for the National Park Service; however, this metric fails to account for the total value of the National Parks. In failing to consider the value of the ecosystem services provided by the National Parks, we fail to quantify and appreciate the contributions our parks make to society.

  7. Library Resource

    Volume 8 Issue 3

    Publicación revisada por pares
    Marzo, 2019
    Estados Unidos de América

    The ownership of agricultural land has important implications for food systems, the environment, farmer livelihoods, and rural economies, communities, and landscapes. This article examines the changing ownership of agricultural lands in the United States, specifically focusing on Oregon, a state with a history of family farm ownership. I first review historical and recent trends in farmland ownership, including private enclosure, consolidation, investor purchase, development, and rising farmland prices.

  8. Library Resource

    Volume 8 Issue 3

    Publicación revisada por pares
    Marzo, 2019
    Malawi, Estados Unidos de América

    Deforestation is recognized as a major driver of the loss of biodiversity and ecosystem services. It also disturbs natural processes such as biogeochemical, hydrological, and ecological cycles. In Malawi, deforestation is estimated to be responsible for the loss of 33,000 hectares per year, and is mainly attributed to agriculture expansion, tobacco growing, and excessive use of biomass. However, little research has been conducted at either the local level or that of forests located on customary land.

  9. Library Resource

    Volume 8 Issue 3

    Publicación revisada por pares
    Marzo, 2019
    Canadá

    We established the statistical relationships between seasonal weather variables and average annual wheat yield (Hard Red Spring and Durum wheat: Triticum spp.) for the period of 1979–2016 for 296 rural municipalities (RMs) throughout six soil zones comprising the arable agricultural zone of Saskatchewan, Canada. Controlling climate variables were identified through Pearson’s product moment correlation analysis and used in stepwise regression to predict wheat yields in each RM.

  10. Library Resource

    Volume 8 Issue 2

    Publicación revisada por pares
    Febrero, 2019
    Global, América Septentrional

    Investigations of global warming potential (GWP) of semiarid cropping systems are needed to ascertain agriculture’s contributions to climate regulation services. This study sought to determine net GWP for three semiarid cropping systems under no-tillage management in the northern Great Plains of North America: spring wheat (Triticum aestivum L.)—fallow (SW-F), continuous spring wheat (CSW) and spring wheat—safflower (Carthamus tinctorius L.)—rye (Secale cereale L.) (SW-S-R).

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