Oecologia

, Volume 109, Issue 1, pp 69–73

Trends in plant carbon concentration and plant demand for N throughout this century

  • J. Peñuelas
  • Marc Estiarte

Abstract

 Atmospheric CO2 concentration has increased by 25% over the preindustrial level. A parallel increase in C concentration and decreases in N concentration and δ13C of plants grown throughout this century have been observed in plant specimens stored in herbaria. We tested our previous results in a study of 12 more species collected in the western Mediterranean throughout this century (1920–1930, 1945–1955, and 1985–1990) and tree rings of Quercus pubescens from the same area. These changes were accompanied by apparent increases in condensed tannin concentration. A decreasing trend in δ15N both in herbarium material and tree rings was also found, indicating that ecosystems might cope with higher plant N demand by decreasing N losses and increasing N fixation and mineralization. These results may contribute to a better understanding of the effects of global change on carbon and nitrogen cycling.

Key words Atmospheric CO2 concentration δ15N δ13C Herbarium specimens Nitrogen 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1996

Authors and Affiliations

  • J. Peñuelas
    • 1
  • Marc Estiarte
    • 1
  1. 1.Centre de Recerca Ecològica i Aplicacions Forestals, Facultat de Ciències, Universitat Autònoma, 08193 Bellaterra, Barcelona, SpainES

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