Research & reports

Elías Machado · Editora Científica Digital eBooks · Brazil (Guarapuava)

This study examines the relationship between climate change, urbanization, and urban and peri-urban agriculture in Guarapuava-PR, Brazil. It emphasizes how regional atmospheric variability intensifies existing socio-environmental vulnerabilities. Guarapuava's climate, characterized by high thermal amplitude, frequent frosts, and irregular rainfall, significantly conditions agricultural production systems, especially in urban and peri-urban areas, negatively affecting productive cycles.

F. Xavier Medina, José Antonio Vázquez–Medina, Marco Covarrubias · Edward Elgar Publishing eBooks · Mexico (Mexico City)

This chapter discusses the factors linking food production, social and environmental problems, and future challenges in the chinampas of Xochimilco, a UNESCO World Heritage wetland area in Mexico City's peri-urban zone. It examines strategies implemented by stakeholders and their effects to envision future scenarios for sustainable food systems. The insularity of the chinampas imposes a particular character on agri-food production and the life of inhabitants, highlighting existing social and environmental problems.

Krishna R. Reddy, Jaqueline Rojas Robles, Suzane A. V. Carneiro, Banuchandra Nagaraja · Journal of Environmental Engineering and Science · United States (Chicago)

Using an existing hydroponics system in Chicago as a case study, this life cycle assessment (environmental impact via SimaPro, social and economic sustainability via a semi-quantitative approach) compared a hypothetical scaled hydroponics system against a scaled community garden serving the same number of users in the same area. The results show hydroponics systems present greater sustainability challenges than community gardens overall, though a hydroponics system incorporating LED lights was found to be more sustainable than the community garden; the authors call for future research to more accurately assess the differences between the two models.

Laura E. Balis, Emily Shaw, Whitney Fung Uy, Katie Nelson, Maryan Isack, Laura Flournoy, Daniele Vest, Jessie Deelo, Amy L. Yaroch · Agriculture & Food Security · United States

This scoping review examined the environmental and health impacts of locally distributed specialty crops in the Midwestern United States, analyzing 9 grey and 19 peer-reviewed sources. While specialty crops positively impacted nutritional intake for diverse populations, the effectiveness of production practices on soil and plant quality and greenhouse gas emissions was mixed. The review concluded that more rigorous study designs with long-term follow-up are needed.

Alessandro Silva de Oliveira, Gustavo Carvalho da Rocha Lima Martins, Gonzalo Oviedo, Lucas José de Oliveira Gomes · Revista Tecnia · Brazil

A 2024 paper reports on an educational practice with elementary school students at a community garden at IFG-Anápolis, Brazil, framed around "omnilateral formation" and critical environmental education. Through periodic visits, workshops, and discussion sessions, the practice addressed problems arising from the use and consumption of pesticides in food. It reports that the critical environmental education approach was significant in revealing the latent meanings behind an agribusiness food market based on unrestrained pesticide use.

Jennifer Engels, Sheree J. Watson, Henrietta Dulai, Kimberly Burnett, Christopher A. Wada, ‘Ano‘ilani Aga, Nathan DeMaagd, J. J. McHugh, Barbara Sumida, Leah L. Bremer · PLoS ONE · United States (O‘ahu)

A researcher-farmer collaboration on O‘ahu's Sumida watercress farm conducted a 25-year trend analysis and a year of intensive spring water sampling. Negative correlations were found between historical crop yields and increases in the Oceanic Niño Index, temperature thresholds, and pest outbreaks. Despite urbanization, on-farm water quality was very high, and microbial analyses suggested the farm provides nutrient retention services to downstream systems. The study demonstrates that challenges facing urban agricultural systems shift over time.

トシオ キクチ, Toshio Kikuchi, 俊夫 菊地 · Institutional Repositories DataBase (IRDB) · Canada

Focusing on community gardens in Metro Vancouver, British Columbia, Canada, particularly in the city of Richmond, this study (2019) sought to clarify how urban agriculture's development is accompanied by the "commodification of rural space." It finds that Metro Vancouver's urban agriculture differs from suburban agriculture in that community gardens prioritize maintaining green and leisure space within the urban environment over agricultural production for food supply. The study concludes that community gardens function as a node connecting "urbanity" and "rurality," existing in the metropolitan periphery through a commodification of rural character for urban leisure use — that is, their role as green/leisure space for urban residents takes precedence over their function as actual food production.

Monika Egerer, Alessandro Ossola, Brenda B. Lin · BioScience · United States (California central coast)

This study conceptualizes community garden soils within the novel ecosystem framework, arguing that gardeners cultivate novel agroecosystems from their garden beds' soil. On the California central coast, community garden soils may not be influenced by land-use legacies associated with geographic location. Instead, intensive soil reworking by gardeners can wash out legacy signals and decadal chronological trends, leading to soil homogenization that reduces biophysical ties to the underlying earth.

John Taylor, Sarah Taylor Lovell, Sam E. Wortman, M.K. Chan · Renewable Agriculture and Food Systems · United States (Chicago)

In Chicago, semi-structured interviews and plant inventories were conducted with 59 African American, Chinese-origin, and Mexican-origin households regarding ecosystem services and tradeoffs in their home food gardens. A total of 387 plant species were identified; gardens of African American households were rich in ornamental species, while those of Chinese-origin households had a depauperate flora. Shade trees and a developed shrub layer were absent from most gardens, suggesting a tradeoff in ecosystem services favoring food production. Only 9.6% of the inventoried species were native to the Chicago area.

Samara Aquino Maia, F. Wachholz, Raquel Gouvêa dos Santos, João Carlos Ferreira Júnior · Boletim Amazônico de Geografia · Brazil (Manaus)

This study identified environmental impacts on a Mindu Igarapé spring in Manaus, Brazil, by collecting water samples at eleven points. Water temperature increased from 29.6 to 30.6°C downstream due to riparian vegetation removal and dredging. pH (6.6-7.7) and electrical conductivity (0.16-0.32 mS/cm) also increased downstream, possibly linked to expanding horticulture using fertilizers. Most analyzed water quality variables were negatively influenced by anthropogenic activities, including horticulture, riparian vegetation removal, dredging, and small dam construction.

Shane R. de Solla, Pamela A. Martin · Environmental Toxicology and Chemistry · United States

Because many reptiles oviposit in soil within agricultural landscapes, this study evaluated the toxicity of two commonly used nitrogenous fertilizers — urea and ammonium nitrate — to snapping turtle (Chelydra serpentina) egg survivorship. Eggs were incubated, unmanipulated and under ambient conditions, in a community garden plot treated with urea at realistic rates up to 200 kg/ha in 2004 and ammonium nitrate up to 2,000 kg/ha in 2005, and separately in covered laboratory bins designed to minimize nitrogen loss through volatilization or leaching. In the field, neither urea nor ammonium nitrate affected hatching success or development, despite ammonium nitrate showing overt toxicity to native plants. In the laboratory, however, both fertilizer exposures reduced hatching success, lowered body mass at hatching, and reduced post-hatching survival compared with controls. The authors attribute the field's lack of toxicity to leaching and atmospheric loss of nitrogen in soil, and conclude that nitrogenous fertilizers likely have little direct impact on turtle eggs deposited in agricultural landscapes.