Competition for nitrogen by three sympatric species of Eucalyptus
Emma M Paulding, Alan JM Baker, Charles R Warren
Annals of Forest Science | SPRINGER FRANCE | Published : 2010
Nitrogen (N) exists in the soil in a variety of different forms and thus plants may avoid competition by taking up N as different chemical forms. This study examined the uptake of nitrate, ammonium and glycine by three co-occurring species of Eucalyptus (E. obliqua, E. radiata and E. rubida) from dry sclerophyll forest in south-eastern Australia. Species preference for N forms was determined by measuring uptake of glycine, nitrate and ammonium from N-labelled solutions containing equimolar 100 μmol L concentrations of all three N forms. KCl extracts were used to assess the relative abundance of the different forms of N in the soil's exchangeable pool. KCl extracts of soil indicated that a..View full abstract
This work was supported by Discovery Grant funding from the Australian Research Council. We wish to thank Kath Whittaker, Loris Duclos, Matt Lee, Frank Jones and Najib Ahmady for assistance in the laboratory and field.