Photo taken on Sept 21, 2015 shows ducks among paddy fields in Congjiang county, Southwest China's Guizhou province.Congjiang, a mountainous county in Southeast Guizhou, has been listed as an experimental unit of the Globally Important Agricultural Heritage Systems, an initiative launched by the Food and Agriculture Organization of the United States since 2011. People in Congjiang still breed fish and keep ducks in the paddy fields, an ecological agriculture tradition which can date back to hundreds of years ago. Tourism based on folk culture and agricultural sightseeing has brought great economic benefits to Congjiang.[Photo/Xinhua]