CONCEPTShttp://cat.aii.caas.cn/concept/32396cat.aii.caas.cnhttp://cat.aii.caas.cn/concept/32406cat.aii.caas.cnhttp://eurovoc.europa.eu/1624eurovoc.europa.euhttp://lod.gesis.org/thesoz/concept/10035556lod.gesis.orghttp://lod.nal.usda.gov/nalt/7529lod.nal.usda.govhttp://www.eionet.europa.eu/gemet/concept/7947www.eionet.europa.euhttp://www.fao.org/countryprofiles/geoinfo/geopolitical/resource/South_Americawww.fao.orghttp://zbw.eu/stw/descriptor/17931-3zbw.eu。