A study on conservation of weed diversity and utilization culture in the rainfed rice area of Southeast Asia

2015 Fiscal Year Final Research Report

• Project/Area Number: 25850233
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental agriculture(including landscape science)
• Research Institution: Kinki University (2014-2015); Osaka University (2013)
• Principal Investigator: IMANISHI Ayumi (牧野亜友美) 近畿大学, 総合社会学部, 准教授 (70447887)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 天水田 / 灌漑田 / 草本植物 / 食用雑草 / 埋土種子 / 灌漑施設

Outline of Final Research Achievements

In order to determine the effects of development of irrigation system on weed flora and utilization in the paddy fields of Southeast Asia, we conducted interview survey regarding edible weeds, vegetation and propagule bank survey in the irrigated and rainfed paddy fields of southern Lao P.D.R. Nine weed species are utilized as edible weeds and almost all respondents reported no changes in either frequency of use or edible weed type eaten before and after the development of the irrigation system. As a result of vegetation survey, species associated with the irrigated paddies were three harmful weeds, Fimbristylis miliacea, Echinochloa colona, and Panicum repens. Moreover, edible weeds germinated only from the rainfed paddy soil samples. In conclusion, the development of irrigation system didn’t influence weed utilization at the present time, but it changed species composition of both ground vegetation and propagule bank in the irrigated paddy fields.

Free Research Field

保全生態学