On April 10-14th 2018, the annual meeting of the American Association of Geographers was held in New Orleans, Louisiana, USA. FEAST organized two sessions on “Mapping urban food production” and the members also made two presentations.
1. “Assessing supply-demand balance of nitrogen toward local-scale organic material circulation: a case study of suburban residential district in Metro Manila”
Yuji Hara, Yuki Sampei
This study focused on assessing supply-demand balance of nitrogen in compost/vegetable productions at vacant lots in subdivisions as well as in barangays, in Quezon City in Metro Manila. We obtained data on the recommended rate of fertilizer application per each vegetable from the precedent studies. The analysis of composition of sample compost was conducted and a total nitrogen amount of locally produced compost was estimated. GIS was used for understanding spatial characteristics of nitrogen balance. We found that almost half of the subdivisions were faced to oversupply though several subdivisions were deemed to be in quite short supply. Cooperation among subdivisions in each barangay had a potential of better nitrogen balance; however, the current centralized composting facilities might not be good support for continued compost recycle system because of their distribution patterns. We proposed that the current barangay-based policies on organic waste management and urban agriculture should be more flexible and more attentions to coordinating system between subdivisions across barangay boundaries. This scheme can contribute to further organic material recycling within living spaces, thereby promoting sustainable living spaces in the suburban residential area.
2. “Mapping agricultural land use change in Kyoto City (Japan) from 2007 to 2017”
Kimisato Oda*,Christoph Rupprecht
The sustainability of agrifood systems in Asia is threatened by the decline of small-scale farming due to globalizing market forces. Agricultural land in urban and peri-urban areas is important not only as a supply source of agricultural products but also as green open space, disaster evacuation space, and other ecosystem services such as rainwater storage and water circulation. GIS-based mapping is effective for grasping the extent of agricultural land use changes, but even government or administration-developed databases fall short of providing a full picture. In this research, we combined existing datasets with satellite imagery from Google Earth, ground-based photography from Google street view and on-site surveys to map changes in urban farmland in the basin of Kyoto City from 2007 to 2017 using QGIS. We discuss observed patterns of decline as well as methodological challenges and directions for future research.
You can find the blog post about AAG2018 from here.