Búsqueda avanzada


Área de conocimiento




119 resultados, página 1 de 10

Landscape and micronutrient fertilizer effect on agro-fortified wheat and teff grain nutrient concentration in western Amhara

Tilahun Amede Elizabeth Bailey Abdul Wahab Mossa Dereje Tirfessa MESFIN KEBEDE DESTA Getachew Agegnehu Tesfaye Shiferaw Sida Stephan Haefele R. Murray Lark Martin Broadley Samuel Gameda (2023, [Artículo])

Agronomic biofortification, encompassing the use of mineral and organic nutrient resources which improve micronutrient concentrations in staple crops is a potential strategy to promote the production of and access to micronutrient-dense foods at the farm level. However, the heterogeneity of smallholder farming landscapes presents challenges on implementing agronomic biofortification. Here, we test the effects of zinc (Zn)- and selenium (Se)-containing fertilizer on micronutrient concentrations of wheat (Triticum aestivum L.) and teff (Eragrostis tef (Zucc.) Trotter) grown under different landscape positions and with different micronutrient fertilizer application methods in the western Amhara region of Ethiopia. Field experiments were established in three landscape positions at three sites, with five treatments falling into three broad categories: (1) nitrogen (N) fertilizer rate; (2) micronutrient fertilizer application method; (3) sole or co-application of Zn and Se fertilizer. Treatments were replicated across five farms per landscape position and over two cropping seasons (2018 and 2019). Grain Zn concentration ranged from 26.6 to 36.4 mg kg−1 in wheat and 28.5–31.2 mg kg−1 in teff. Grain Se concentration ranged from 0.02 to 0.59 mg kg−1 in wheat while larger concentrations of between 1.01 and 1.55 mg kg−1 were attained in teff. Larger concentrations of Zn and Se were consistently attained when a foliar fertilizer was applied. Application of ⅓ nitrogen (N) yielded significantly larger grain Se concentration in wheat compared to a recommended N application rate. A moderate landscape effect on grain Zn concentration was observed in wheat but not in teff. In contrast, strong evidence of a landscape effect was observed for wheat and teff grain Se concentration. There was no evidence for any interaction of the treatment contrasts with landscape position except in teff, where an interaction effect between landscape position and Se application was observed. Our findings indicate an effect of Zn, Se, N, landscape position, and its interaction effect with Se on grain micronutrient concentrations. Agronomic biofortification of wheat and teff with micronutrient fertilizers is influenced by landscape position, the micronutrient fertilizer application method and N fertilizer management. The complexity of smallholder environmental settings and different farmer socio-economic opportunities calls for the optimization of nutritional agronomy landscape trials. Targeted application of micronutrient fertilizers across a landscape gradient is therefore required in ongoing agronomic biofortification interventions, in addition to the micronutrient fertilizer application method and the N fertilizer management strategy.

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA BIOFORTIFICATION LANDSCAPE SELENIUM ZINC WHEAT

Do provisioning ecosystem services change along gradients of increasing agricultural production?

Ronju Ahammad Stephanie Tomscha Sarah Gergel Frédéric Baudron Jean-Yves Duriaux Chavarría Samson Foli Dominic Rowland Josh Van Vianen Terence Sunderland (2024, [Artículo])

Context: Increasing agricultural production shapes the flow of ecosystem services (ES), including provisioning services that support the livelihoods and nutrition of people in tropical developing countries. Although our broad understanding of the social-ecological consequences of agricultural intensification is growing, how it impacts provisioning ES is still unknown. Objectives: We examined the household use of provisioning ES across a gradient of increasing agricultural production in seven tropical countries (Bangladesh, Burkina Faso, Cameroon, Ethiopia, Indonesia, Nicaragua and Zambia). We answered two overarching questions: (1) does the use of provisioning ES differ along gradients of agriculture production ranging from zones of subsistence to moderate and to high agriculture production? and (2) are there synergies and/or trade-offs within and among groups of ES within these zones? Methods: Using structured surveys, we asked 1900 households about their assets, livestock, crops, and collection of forest products. These questions allowed us to assess the number of provisioning ES households used, and whether the ES used are functionally substitutable (i.e., used similarly for nutrition, material, and energy). Finally, we explored synergies and trade-offs among household use of provisioning ES. Results: As agricultural production increased, provisioning ES declined both in total number and in different functional groups used. We found more severe decreases in ES for relatively poorer households. Within the functional groups of ES, synergistic relationships were more often found than trade-offs in all zones, including significant synergies among livestock products (dairy, eggs, meat) and fruits. Conclusions: Considering landscape context provides opportunities to enhance synergies among provisioning services for households, supporting resilient food systems and human well-being.

Agricultural Production Zones Agricultural Intensifcation Synergies and Trade-Offs Landscape Multifunctionality Social-Ecological Systems CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA AGRICULTURE INTENSIFICATION ECOSYSTEM SERVICES LANDSCAPE SOCIAL-ECOLOGICAL RESILIENCE ECOSYSTEM SERVICES

El paisaje maya en la experiencia turística de finales del siglo XX en el territorio yucateco

Daniel Jesús Reyes Magaña (2023, [Capítulo de libro])

Los recorridos turísticos de miles de visitantes por año en el territorio maya yucateco, al norte de la Península de Yucatán, son herencia de los primeros viajeros extranjeros del siglo XIX. Desde esa época, estos aventureros se establecieron como los guías que, a través de su legado, conducen la mirada hacia la contemplación del pasado. Los turistas en la actualidad caminan por los pasos de dichos viajeros, atestiguando la mirada del paisaje depositada en los vestigios mayas ancestrales, que articulan cada uno de los elementos del paisaje del territorio. Sin embargo, la velocidad del viaje en el escenario turístico contemporáneo ha detonado la pérdida de la integralidad paisajística originaria debido a la actual búsqueda de emociones efímeras en el turismo. La parafernalia turística ha cubierto el patrimonio paisajístico maya de consumismo y mercantilización, enfocados a la venta de experiencias. En contraparte, el encuentro profundo entre el hombre y el paisaje, condicionado determinantemente por la dinámica turística, es posible en la experiencia humana como se descubre en la poética paisajística de la obra literaria “Palmeras de la brisa rápida” de Juan Villoro publicada por primera vez en 1989, y que revela las pautas del acontecimiento paisajístico en los viajeros contemporáneos.

The sightseeing tours of thousands of visitors per year in the Yucatan Mayan territory, north of the Yucatan Peninsula, are the heritage of the first foreign travelers of the nineteenth century. From that time on, these adventurers established themselves as the guides who, through their legacy, printed in travel books, engravings, and holiday triptychs, turn their gaze to the contemplation of the past. Tourists today walk through the footsteps of such travelers, attesting to the view of the landscape deposited in the ancestral Mayan vestiges, which articulate each of the elements of the landscape of the territory. However, the speed of travel on the contemporary tourist stage has detonated the loss of original landscape integrality due to the current search for ephemeral emotions in tourism. Tourist paraphernalia has covered the Mayan landscape heritage of consumerism and commodization, focused on the sale of experiences. In contrast, the deep encounter between man and landscape, conditioned decisively by tourist dynamics, is possible in the human experience as discovered in the poetic landscape of Juan Villoro’s literary work “Palmeras de la brisa rápida” first published in 1989, and which reveals the patterns of the landscape event in contemporary travelers.

Yucatán, turismo, experiencia paisajística, Juan Villoro, paisaje maya. Yucatan, tourism, landscape experience, Mayan landscape. Yucatán (Mexico : State) Cultural landscapes--Mexico. Tourism--Mexico--Yucatán (State) Yucatán (Mexico : State)--Commerce. Paisajes culturales. Turismo. F1376 CIENCIAS SOCIALES CIENCIAS ECONÓMICAS ECONOMÍA SECTORIAL ECONOMÍA SECTORIAL. TURISMO

Propuesta paisajística integral para la UAM, Unidad Azcapotzalco

Cynthia García Marín (2023, [Tesis de maestría])

315 páginas. Maestría en Diseño, Planificación y Conservación de Paisajes y Jardines.

En México, la educación superior comienza en 1521 cuando la universidad se crea como institución educativa, inaugurando en 1553 La Real y Pontificia Universidad de México. En 1910 se funda la Universidad Nacional de México y en 1954 fue inaugurada la Ciudad Universitaria de la UNAM, esta fecha representa un hito en la historia de los espacios físicos de las universidades mexicanas. Debido a la demanda de educación superior y al movimiento estudiantil de 1968, se concibe la idea de crear una nueva universidad en la ZONA METROPOLITANA de la Ciudad de México, la Universidad Autónoma Metropolitana con sus Unidades al norte, al oriente y al sur, posteriormente se abrieron 2 Unidades más. Cada una de estas Unidades funciona de manera independiente, teniendo sus propios órganos de decisión, lo que se refleja en la planta física de conjunto. Es al norte de la ciudad donde surge la Unidad Azcapotzalco, que con el paso de los años se ha ido conformando de acuerdo a sus necesidades inmediatas tratando de seguir el proyecto inicial, sin embargo, debido a los ajustes en sus diferentes intervenciones arquitectónicas, se ha propiciado una falta de integración entre el espacio arquitectónico y el espacio abierto impactando directamente en el paisaje y en la pérdida gradual de identidad de la Unidad. Este trabajo reúne la información que describe la conformación del paisaje en la Unidad a lo largo de casi 50 años, en donde se analizan los componentes del paisaje en sus diferentes sistemas; ecológico-conformación medioambiental, sociocultural-conformación de la estructura urbana, polisensorial-conformación a través de los sentidos y su contexto histórico-conformación a través del tiempo. Esta identificación, permite realizar el análisis detallado de los factores que intervienen directa e indirectamente en el estado actual del paisaje de la Unidad, con este diagnóstico se elabora una síntesis creativa que especifica las limitaciones y potencialidades que afectan la conformación del espacio abierto. A partir de esto se elaboró un plan maestro, que integra las principales líneas de acción, estructuradas en ejes de diseño que tienen como propósito ordenar y facilitar la programación para mejorar las condiciones actuales por medio de acciones específicas que contribuyan al mejoramiento, conservación y creación de un paisaje que se integre en su conjunto y permita a la UAM-Azcapotzalco ser revalorizada como un sitio con identidad y con valores históricos, sociales, estéticos, biológicos y paisajísticos.

In Mexico, higher education began in 1521 when the university was created as an educational institution, inaugurating in 1553 La Real y Pontificia Universidad de México. The National University of Mexico was founded in 1910 and the UNAM University City was inaugurated in 1954, this date represents a milestone in the history of the physical spaces of Mexican universities. Due to the demand for higher education and the student movement of 1968, the idea of creating a new university in the METROPOLITAN ZONE of Mexico City was conceived, the Universidad Autónoma Metropolitana with its Units to the north, east and south, later 2 more Units were opened. Each one of these Units works independently, having its own decision-making bodies, which is reflected in the physical plant as a whole. It is to the north of the city where the Azcapotzalco Unit arises, which over the years has had to conform according to its immediate needs trying to follow the initial project, however, due to adjustments in its different architectural interventions, a lack of integration between the architectural space and the open space has been fostered, directly impacting the landscape and the gradual loss of identity of the Unit. This work gathers the information that describes the conformation of the landscape in the Unit over almost 50 years, where the components of the landscape in its different systems are analyzed; ecological-environmental conformation, sociocultural-conformation of the urban structure, polysensory-conformation through the senses and its historical context-conformation through time. This identification allows a detailed analysis of the factors that intervene directly and indirectly in the current state of the landscape of the Unit, with this diagnosis a creative synthesis is elaborated that specifies the limitations and potentialities that affect the conformation of the open space. Based on this, a master plan was prepared, which integrates the main lines of action, structured into design axes whose purpose is to order and facilitate programming to improve current conditions through specific actions that contribute to the improvement, conservation and creation of a landscape that is integrated as a whole and allows the UAM-Azcapotzalco to be revalued as a site with identity and with historical, social, aesthetic, biological and landscape values.

Paisaje, universidad, conformación, diagnóstico, lineamientos, identidad, integrar, revalorizar, plan maestro, propuesta. Landscape, university, conformation, diagnosis, guidelines, identity, integrate, revalue, master plan, proposal. Landscape design. Landscape assessment. Landscape changes. Landscapes--Social aspects. Universidad Autónoma Metropolitana. Diseño de paisajes. Evaluación del paisaje. Cambios de paisaje. SB472.45 HUMANIDADES Y CIENCIAS DE LA CONDUCTA CIENCIAS DE LAS ARTES Y LAS LETRAS ARQUITECTURA JARDINES Y PARQUES

Review of Nationally Determined Contributions (NCD) of China from the perspective of food systems

Tek Sapkota (2023, [Documento de trabajo])

China is the largest emitter of greenhouse gases (GHG) and one of the countries most affected by climate change. China's food systems are a major contributor to climate change: in 2018, China's food systems emitted 1.09 billion tons of carbondioxide equivalent (CO2eq) GHGs, accounting for 8.2% of total national GHG emissions and 2% of global emissions. According to the Third National Communication (TNC) Report, in 2010, GHG emissions from energy, industrial processes, agriculture, and waste accounted for 78.6%, 12.3%, 7.9%, and 1.2% of total emissions, respectively, (excluding emissions from land use, land-use change and forestry (LULUCF). Total GHG emissions from the waste sector in 2010 were 132 Mt CO2 eq, with municipal solid waste landfills accounting for 56 Mt. The average temperature in China has risen by 1.1°C over the last century (1908–2007), while nationally averaged precipitation amounts have increased significantly over the last 50 years. The sea level and sea surface temperature have risen by 90 mm and 0.9°C respectively in the last 30 years. A regional climate model predicted an annual mean temperature increase of 1.3–2.1°C by 2020 (2.3–3.3°C by 2050), while another model predicted a 1–1.6°C temperature increase and a 3.3–3.7 percent increase in precipitation between 2011 and 2020, depending on the emissions scenario. By 2030, sea level rise along coastal areas could be 0.01–0.16 meters, increasing the likelihood of flooding and intensified storm surges and causing the degradation of wetlands, mangroves, and coral reefs. Addressing climate change is a common human cause, and China places a high value on combating climate change. Climate change has been incorporated into national economic and social development plans, with equal emphasis on mitigation and adaptation to climate change, including an updated Nationally Determined Contribution (NDC) in 2021. The following overarching targets are included in China's updated NDC: • Peaking carbon dioxide emissions “before 2030” and achieving carbon neutrality before 2060. • Lowering carbon intensity by “over 65%” by 2030 from the 2005 level. • Increasing forest stock volume by around 6 billion cubic meters in 2030 from the 2005 level. The targets have come from several commitments made at various events, while China has explained very well the process adopted to produce its third national communication report. An examination of China's NDC reveals that it has failed to establish quantifiable and measurable targets in the agricultural sectors. According to the analysis of the breakdown of food systems and their inclusion in the NDC, the majority of food system activities are poorly mentioned. China's interventions or ambitions in this sector have received very little attention. The adaptation component is mentioned in the NDC, but is not found to be sector-specific or comprehensive. A few studies have rated the Chinese NDC as insufficient, one of the reasons being its failure to list the breakdown of each sector's clear pathway to achieving its goals. China's NDC lacks quantified data on food system sub-sectors. Climate Action Trackers' "Insufficient" rating indicates that China's domestic target for 2030 requires significant improvements to be consistent with the Paris Agreement's target of 1.5°C temperature limit. Some efforts are being made: for example, scientists from the Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences (IEDA-CAAS) have developed methods for calculating GHG emissions from livestock and poultry farmers that have been published as an industrial standard by the Ministry of Agriculture and Rural Affairs, PRC (Prof Hongmin Dong, personal communication) but this still needs to be consolidated and linked to China’s NDC. The updated Nationally Determined Contributions fall short of quantifiable targets in agriculture and food systems as a whole, necessitating clear pathways. China's NDC is found to be heavily focused on a few sectors, including energy, transportation, and urban-rural development. The agricultural sectors' and food systems' targets are vague, and China's agrifood system has a large carbon footprint. As a result, China should focus on managing the food system (production, processing, transportation, and food waste management) to reduce carbon emissions. Furthermore, China should take additional measures to make its climate actions more comprehensive, quantifiable, and measurable, such as setting ambitious and clear targets for the agriculture sector, including activity-specific GHG-reduction pathways; prioritizing food waste and loss reduction and management; promoting sustainable livestock production and low carbon diets; reducing chemical pollution; minimizing the use of fossil fuel in the agri-system and focusing on developing green jobs, technological advancement and promoting climate-smart agriculture; promoting indigenous practices and locally led adaptation; restoring degraded agricultural soils and enhancing cooperation and private partnership. China should also prepare detailed NDC implementation plans including actions and the GHG reduction from conditional targets.

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA GREENHOUSE GAS EMISSIONS CLIMATE CHANGE FOOD SYSTEMS LAND USE CHANGE AGRICULTURE POLICIES DATA ANALYSIS FOOD WASTES

Review of Nationally Determined Contributions (NCD) of Kenya from the perspective of food systems

Tek Sapkota (2023, [Documento de trabajo])

Agriculture is one of the fundamental pillars of the 2022–2027 Bottom-up Economic Transformation Plan of the Government of Kenya for tackling complex domestic and global challenges. Kenya's food system is crucial for climate change mitigation and adaptation. Kenya has prioritized aspects of agriculture, food, and land use as critical sectors for reducing emissions towards achieving Vision 2030's transformation to a low-carbon, climate-resilient development pathway. Kenya's updated NDC, as well as supporting mitigation and adaptation technical analysis reports and other policy documents, has identified an ambitious set of agroecological transformative measures to promote climate-smart agriculture, regenerative approaches, and nature-positive solutions. Kenya is committed to implementing and updating its National Climate Change Action Plans (NCCAPs) to present and achieve the greenhouse gas (GHG) emission reduction targets and resilience outcomes that it has identified.

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CLIMATE CHANGE GREENHOUSE GAS EMISSIONS FOOD SYSTEMS LAND USE CHANGE AGRICULTURE POLICIES DATA ANALYSIS FOOD WASTES

Review of Nationally Determined Contributions (NCD) of Vietnam from the perspective of food systems

Tek Sapkota (2023, [Documento de trabajo])

Over the past decades, Vietnam has significantly progressed and has transformed from being a food-insecure nation to one of the world’s leading exporters in food commodities, and from one of the world’s poorest countries to a low-middle-income country. The agriculture sector is dominated by rice and plays a vital role in food security, employment, and foreign exchange. Vietnam submitted its updated Nationally Determined Contributions (NDC) in 2022 based on the NDC 2020. There is a significant increase in greenhouse gas (GHG) emission reduction, towards the long-term goals identified in Vietnam’s National Climate Change Strategy to 2025, and efforts are being made to fulfil the commitments made at COP26. The Agriculture Sector is the second-largest contributor of GHG emissions in Vietnam, accounting for 89.75 MtCO2eq, which was about 31.6 percent of total emissions in 2014. Rice cultivation is the biggest source of emissions in the agriculture sector, accounting for 49.35% of emissions from agriculture. The total GHG removal from Land Use, Land Use Change and Forestry (LULUCF) in 2014 was -37.54 MtCO2eq, of which the largest part was from the forest land sub-sector (35.61 MtCO2eq), followed by removal from croplands (7.31 MtCO2eq) (MONRE 2019).

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CLIMATE CHANGE GREENHOUSE GAS EMISSIONS FOOD SYSTEMS LAND USE CHANGE AGRICULTURE POLICIES DATA ANALYSIS

Review of Nationally Determined Contributions (NCD) of Colombia from the perspective of food systems

Tek Sapkota (2023, [Documento de trabajo])

Food is a vital component of Colombia's economy. The impact of climate change on agriculture and food security in the country is severe. The effects have resulted in decreased production and in the productivity of agricultural soil. Desertification processes are accelerating and intensifying. Colombia's government formally submitted its Nationally Determined Contribution (NDC) on December 29, 2020. This paper examines Colombia's NDC from the standpoint of the food system.

CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA CLIMATE CHANGE GREENHOUSE GAS EMISSIONS FOOD SYSTEMS LAND USE CHANGE AGRICULTURE POLICIES DATA ANALYSIS FOOD WASTES