6VITOUSEK P J,ABER J D,HOWARTH R W,et al.Human Alternation of the Global Nitrogen Cycle:Sources and Consequences[J].Ecological Applications,1997,7(3):737-750.
7DUK J,LENEMAN H,VAN DER VEEN M.The Nutrient Flow Model for Dutch Agriculture:A Tool for Environmental Policy Evaluation[J].Journal of Environmental Management,1996,46(1):43-55.
8WOLF J,R(O)TTER R,OENEMA O.Nutrient Emission Models in Environmental Policy Evaluation at Different Scales-Experience From the Netherlands[J].Agriculture,Ecosystems and Environment,2005,105(2):291-306.
9OECD.Environmental Indicators for Asriculture,Volume 3:Methods and Results[R].Paris:Organization for Economic Co-Operation and Development,2001.