REFERENCES

• Alvarez-Cobelas , M. , Angeler , D.G. and Sanchez-Carrillo , S. 2008 . Export of nitrogen from catchments: a worldwide analysis . Environmental Pollution , 156 : 261 – 269 .
   PubMed Web of Science ®Google Scholar
• Carpenter , S.R. 1998 . Nonpoint pollution of surface waters with phosphorus and nitrogen . Ecological Application , 8 : 559 – 68 .
   Web of Science ®Google Scholar
• Harasawa , H. 1990 . “ Supporting system for watersheds managements of lakes ” . In No. 3 Kankyo Youryo Symposium (Proceedings of the third symposium on aquatic carrying capacity and its application) , Edited by: Ebise , S. 1 – 13 . Tsukuba , , Japan : Tsukuba: NIES . in Japanese
   Google Scholar
• Havens , K.E. 2001 . Nutrient dynamics and the eutrophication of shallow lakes Kasumigaura (Japan), Donghu (PR China), and Okeechobee (USA) . Environmental Pollution , 111 ( 2001 ) : 263 – 272 .
   Web of Science ®Google Scholar
• He , B. 2009a . Integrated biogeochemical modelling of nitrogen load from anthropogenic and natural sources in Japan . Ecological Modelling , 220 : 2325 – 2334 .
   Web of Science ®Google Scholar
• He , B. 2009b . Using remotely sensed imagery to estimate potential annual pollutant loads in river basins . Water Science and Technology , 60 ( 8 ) : 2009 – 2015 . doi: 10.2166/wst.2009.596
   Web of Science ®Google Scholar
• He , B. August 2010 2010 . “ Estimation of monthly potential nitrogen load from agricultural and forest watersheds using Quickbird remote sensing imagery ” . In Proceedings of ISPRS Commission VIII 2010 Symposium August 2010 , 9 – 13 . Kyoto , , Japan
   Google Scholar
• He , B. 2011 . Assessment of global nitrogen pollution in rivers using an integrated biogeochemical modeling framework . Water Research , 45 ( 8 ) : 2573 – 2586 . doi: 10.1016/j.watres.2011.02.011
   Web of Science ®Google Scholar
• Higano , Y. and Hirose , F. 2000 . A simulation analysis to reduce contamination from the catchment area of Lake Kasumigaura . Studies on Regional Science , 30 ( 1 ) : 47 – 63 .
   Google Scholar
• Kimura , S.D. 2005 . Creation of an eco-balance model to assess environmental risks caused by nitrogen load in a basin-agroecosystem , Japan : Thesis (PhD), Hokkaido University Graduate School of Agriculture .
   Google Scholar
• Mishima , S. 2001 . Recent trend of nitrogen flow associated with agricultural production in Japan . Soil Science and Plant Nutrition , 47 ( 1 ) : 157 – 166 .
   Web of Science ®Google Scholar
• Moriizumi , S. , Osaki , K. and Kikkawa , A. 1975 . Relation between the amounts of fertilizer on the field and the livestock waste and water pollution of streams flowing into Lake Kasumigaura. I: On the relation between the amount of application of fertilizers and the specific pollutional loads of nitrogen and phosphorus in main streams flowing into Lake Nishiura . Ibaraki daigaku nogakubu gakujutsu hokoku (Scientific Report of the Faculty of Agriculture, Ibaraki University) , 23 : 89 – 99 . in Japanese with English summary
   Google Scholar
• Ogawa , Y. and Sakai , H. 1984 . The fate of nitrate in rice paddies flowing from upland fields . Nihon dojo hiryo gaku zasshi (Japan Journal of Soil Science and Plant Nutrition) , 55 : 533 – 538 . in Japanese
   Google Scholar
• Oki , K. and Yasuoka , Y. 2008 . Mapping the potential annual total nitrogen load in the river basins of Japan with remotely sensed imagery . Remote Sensing of Environment , 112 ( 6 ) : 3091 – 3098 .
   Web of Science ®Google Scholar
• Park , J. 2010 . Potential effects of climate change and variability on watershed biogeochemical processes and water quality in Northeast Asia . Environment International , 36 ( 2 ) : 212 – 225 .
   Web of Science ®Google Scholar
• Paul , M.J. and Meyer , J.L. 2001 . Streams in the urban landscape . Annual Review of Ecological Systems , 32 : 333 – 65 .
   Google Scholar
• Seitzinger , S.P. and Kroeze , C. 1998 . Global distribution of nitrous oxide production and N inputs in freshwater and coastal marine ecosystems . Global Biogeochemical Cycles , 12 : 93 – 113 .
   Web of Science ®Google Scholar
• Smith , S.V. 2005 . River nutrient loads and catchment size . Biogeochemistry , 75 : 83 – 107 .
   Web of Science ®Google Scholar
• Strayer , D.L. 2003 . Effects of land cover on stream ecosystems: roles of empirical models and scaling issues . Ecosystems , 6 : 407 – 423 .
   Web of Science ®Google Scholar
• Turner , R.E. and Rabalais , N.N. 2003 . Linking landscape and water quality in the Mississippi River basin for 200 years . Bioscience , 53 : 563 – 572 .
   Web of Science ®Google Scholar