1. Towards an ecological understanding of biological nitrogen fixation

   • Peter M. Vitousek
   • Ken Cassman
   • Janet I. Sprent

   OriginalPaper Pages: 1 - 45

2. Dinitrogen fixation in the world's oceans

   • D. Karl
   • A. Michaels
   • L. Stal

   OriginalPaper Pages: 47 - 98

3. The origin, composition and rates of organic nitrogen deposition: A missing piece of the nitrogen cycle?

   • Jason C. Neff
   • Elisabeth A. Holland
   • Kristina M. Russell

   OriginalPaper Pages: 99 - 136

4. Anthropogenic nitrogen sources and relationships to riverine nitrogen export in the northeastern U.S.A.

   • Elizabeth W. Boyer
   • Christine L. Goodale
   • Robert W. Howarth

   OriginalPaper Pages: 137 - 169

5. Sources of nitrate in rivers draining sixteen watersheds in the northeastern U.S.: Isotopic constraints

   • Bernhard Mayer
   • Elizabeth W. Boyer
   • Keith Paustian

   OriginalPaper Pages: 171 - 197

6. Nitrogen retention in rivers: model development and application to watersheds in the northeastern U.S.A.

   • Sybil P. Seitzinger
   • Renée V. Styles
   • Nico van Breemen

   OriginalPaper Pages: 199 - 237

7. Forest nitrogen sinks in large eastern U.S. watersheds: estimates from forest inventory and an ecosystem model

   • Christine L. Goodale
   • Kate Lajtha
   • Norbert A. Jaworski

   OriginalPaper Pages: 239 - 266

8. Where did all the nitrogen go? Fate of nitrogen inputs to large watersheds in the northeastern U.S.A.

   • N van Breemen
   • E.W. Boyer
   • G. Billen

   OriginalPaper Pages: 267 - 293

9. A comparison of models for estimating the riverine export of nitrogen from large watersheds

   • Richard B. Alexander
   • Penny J. Johnes
   • Richard A. Smith

   OriginalPaper Pages: 295 - 339

10. Regional analysis of inorganic nitrogen yield and retention in high-elevation ecosystems of the Sierra Nevada and Rocky Mountains

    • James O. Sickman
    • John M. Melack
    • John L. Stoddard

    OriginalPaper Pages: 341 - 374

11. Yield of nitrogen from minimally disturbed watersheds of the United States

    • William M. Lewis Jr.

    OriginalPaper Pages: 375 - 385

12. Nitrogen budgets for the Republic of Korea and the Yellow Sea region

    • V.N. Bashkin
    • S.U. Park
    • C.B. Lee

    OriginalPaper Pages: 387 - 403

13. Regional nitrogen budgets for China and its major watersheds

    • G.X. Xing
    • Z.L. Zhu

    OriginalPaper Pages: 405 - 427

14. Landscape, regional and global estimates of nitrogen flux from land to sea: Errors and uncertainties

    • Penny J. Johnes
    • Dan Butterfield

    OriginalPaper Pages: 429 - 476

15. Policy implications of human-accelerated nitrogen cycling

    • Arvin R. Mosier*
    • Marina Azzaroli Bleken
    • Zhao-liang Zhu

    OriginalPaper Pages: 477 - 516

16. Note added in proof

    OriginalPaper Pages: 517 - 519