Biblio
] . Anon.2005. Elevated atmospheric carbon dioxide impacts carbon dynamics in a C(4)-sorghum-soil agroecosystem: An application of stable carbon isotopes (delta carbon-13) in tracing the fate of carbon in the atmosphere-plant-soil ecosystem. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=885700691&sid=10&Fmt=2&clientId=43922&RQT=309&VName=PQD.