Impact Of Gardens Research Articles

Investigation of the Impact of Land-Use Distribution on PM2.5 in Weifang: Seasonal Variations.

As air pollution becomes highly focused in China, the accurate identification of its influencing factors is critical for achieving effective control and targeted environmental governance. Land-use distribution is one of the key factors affecting air quality, and research on the impact of land-use distribution on air pollution has drawn wide attention. However, considerable studies have mostly used linear regression models, which fail to capture the nonlinear effects of land-use distribution on PM2.5 (fine particulate matter with a diameter less than or equal to 2.5 microns) and to show how impacts on PM2.5 vary with land-use magnitudes. In addition, related studies have generally focused on annual analyses, ignoring the seasonal variability of the impact of land-use distribution on PM2.5, thus leading to possible estimation biases for PM2.5. This study was designed to address these issues and assess the impacts of land-use distribution on PM2.5 in Weifang, China. A machine learning statistical model, the boosted regression tree (BRT), was applied to measure nonlinear effects of land-use distribution on PM2.5, capture how land-use magnitude impacts PM2.5 across different seasons, and explore the policy implications for urban planning. The main conclusions are that the air quality will significantly improve with an increase in grassland and forest area, especially below 8% and 20%, respectively. When the distribution of construction land is greater than around 10%, the PM2.5 pollution can be seriously substantially increased with the increment of their areas. The impact of gardens and farmland presents seasonal characteristics. It is noted that as the weather becomes colder, the inhibitory effect of vegetation distribution on the PM2.5 concentration gradually decreases, while the positive impacts of artificial surface distributions, such as construction land and roads, are aggravated because leaves drop off in autumn (September–November) and winter (December–February). According to the findings of this study, it is recommended that Weifang should strengthen pollution control in winter, for instance, expand the coverage areas of evergreen vegetation like Pinus bungeana Zucc. and Euonymus japonicus Thunb, and increase the width and numbers of branches connecting different main roads. The findings also provide quantitative and optimal land-use planning and strategies to minimize PM2.5 pollution, referring to the status of regional urbanization and greening construction.

School Gardens in the Distrito Federal, Brazil

OBJECTIVE: The aim of the present study was to identify experiences with gardens in public schools in the Distrito Federal, Brazil, and to analyze factors involved in their use to promote healthy eating habits. METHODS: This is an analytical cross-sectional study with data collection in two phases: (1) telephone contact with all public schools in the Distrito Federal; (2) interviews conducted with a sample of schools with a garden (n=105). RESULTS: Of the 582 schools in the Distrito Federal, 453 (77.8%) participated in phase 1 and 37.7% of these had a garden. Rural schools had a higher prevalence of gardens (p=0.003). Among the schools which had no garden, 75.2% (n=212) had interest in creating one. The main reason for the deactivation of gardens was a lack of manpower to maintain them. The main reason for creating a garden was to supplement school food (56.2%). The garden was used as an educational space to promote healthy eating habits by 60.8% of the schools. CONCLUSION: An expressive percentage of schools with gardens (37.7%) was identified in the Distrito Federal. A number of factors were associated with the presence of a garden, including the location and size of the school, as well as the level of education. A significant percentage of schools reported using the garden as a space to promote healthy eating habits. This result must be refined by assessing the use and impact of gardens as a tool to promote healthy eating habits in the school community.