Affiner votre recherche
Résultats 1721-1730 de 2,185
[New approaches in social research and the rural development] | Nuevos enfoques en la investigacion social y el desarrollo rural
1997
Rivera Herrejon, Gladis
[Evaluation of farmer milk production. Case of two communities of Toluca Valley, Mexico State] | Caracterizacion y evaluacion de los sistemas campesinos de produccion de leche. El caso de dos comunidades del Valle de Toluca
1997
Castelan Ortega, Octavio Alonso | Mathewman, Richard W. | Fawcett, Roy | Smith, Anthony | Gonzalez Martinez, Eloy | Burgos Garcia, Ramon | Cruz Juarez, Daniel de la
[Methodological approaches in studing sociodemographic change in rural societies] | Enfoques metodologicos alternativos para el estudio del cambio sociodemografico en las sociedades rurales
1997
Gutierrez Sanchez, Sergio
[Methodology in the participative research of dairy farmers system of Mexico State] | Metodologia de investigacion participativa rural de sistemas campesinos de produccion de leche en el estado de Mexico
1997
Arriaga Jordan, Carlos | Espinoza Ortega, Angelica | Castelan Ortega, Octavio Alonso | Sanchez Vera, Ernesto
[Development theories. An approach and a proposal from the Latin American perspective] | Teorias del desarrollo. Un enfoque y una propuesta desde la perspectiva latinoamericana
1997
Liendo Vera, Isidoro
Technology assessment and transfer: an Australian perspective
1994
Williams, M. | Munro, R. (Department of Primary Industries and Energy, Canberra (Australia). Bureau of Resource Sciences)
Food systems transformation in Vietnam – research and collaboration lay the foundation Texte intégral
2023
Huynh, Tuyen | Pham, Huong | Lundy, Mark M.
Vietnam aims to transform its food systems in a transparent, responsible and sustainable manner. To help achieve this, the new CGIAR research initiative “Sustainable Healthy Diets through Food Systems Transformation” (SHiFT) is working with the emerging multi-stakeholder platforms in the country in order to support the planning and implementation of specific activities. This article demonstrates success already achieved.
Afficher plus [+] Moins [-]Gender, household behavior, and rural development Texte intégral
2021
Doss, Cheryl | Quisumbing, Agnes R.
Our understanding of decision-making within rural households has changed substantially since interest in intrahousehold decision-making emerged in the 1980s. Conventional wisdom, rooted in the unitary theory of the household, held that households are groups of individuals who have the same preferences and fully pool their resources (Becker 1981). Accumulating empirical evidence has shifted this concept of the household in which households decide “as one” to a “collective” model in which individual household members may have different preferences, may not completely pool resources, and may bargain over outcomes in both production and consumption (Haddad, Hoddinott, and Alderman 1997).
Afficher plus [+] Moins [-]The composition and richness of ground cover vegetation in drained forest stand Texte intégral
2024
Liepina, Agnese Anta | Jansone, Diāna | Samariks, Valters | Jansons, Āris
Forest drainage is a common management practice, carried out in order to improve tree growth; however, the alterations in hydrological and microclimate dynamics can cause diverse changes in the characteristics of ground cover vegetation. The aim of study was to characterise the composition and richness of ground cover vegetation in drained forest stands, where the groundwater levels have been affected by the reconstruction of drainage diches. Research was conducted in the hemiboreal forests of Latvia. Three study sites were chosen, measurements of groundwater level, stand parameters and projective cover of ground covered vegetation took place in two stands which underwent reconstruction and restoration of the drainage system in 2019, and a control stand, where the drainage system had not been restored. For assessing the relationship of ground cover vegetation in relation to groundwater level and stand factors, DCA analysis was used. The differences between stands, regarding the species projective cover and species composition, were assessed by ANOSIM (Analysis of similarities). Sites, where drainage ditches were fully or partially reconstructed exhibited a greater diversity of ground cover vegetation species compared to the control stand, where no renewal of drainage ditches had occurred. Conversely, the control stand displayed a higher projective cover of the bryophyte layer. The composition of ground cover vegetation species differed amongst all studied stands, the varying stand characteristics and co-dominant tree species in canopy layer had a more pronounced influence on ground cover vegetation, making it complicated to evaluate direct impact of groundwater level.
Afficher plus [+] Moins [-]Radial growth response of Japanese walnut (Juglans ailantifolia) to meteorological conditions in Latvia Texte intégral
2024
Jansone, Diāna | Matisons, Roberts | Straupe, Inga | Jansons, Āris
The introduction of non-native tree species has been used as a climate change mitigation tool. To ensure the anticipated benefits, the analysis of species radial growth reactions to meteorological factors should be carried out. Initially, tree species were introduced to non-native regions as food resources, yet the focus has now shifted towards favourable wood properties and growth rates. This study used tree ring width measurements of Japanese walnut Juglans ailantifolia and climate data to examine the relationships between these variables. A total of 30 trees were sampled from a stand located in the southern part of Latvia. Tree ring width (TRW) was measured, and residual chronology was derived. Pearson correlation analysis was used to detect the correlating meteorological factors, and a linear mixed-effects model was used to detect the key factors. The correlation analysis indicated generally low correlation coefficients between TRW and meteorological factors, primarily correlating with summer precipitation, both the current and preceding summer, highlighting carry-over effects. Furthermore, signature years underscored the negative effect of low temperatures and summer droughts on the radial growth of Japanese walnuts. However, the observed variation in TRW between years, not fully explained by meteorological factors, suggests a dynamic rather than stable relationship.
Afficher plus [+] Moins [-]