Field effect of P fertilization on N2 fixation rate of Ulex europaeus |
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Authors: | Xavier Cavard Laurent Augusto Etienne Saur Pierre Trichet |
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Institution: | 1. UMR 1220 TCEM (INRA), BP 81, 33883, Villenave d’Ornon Cedex, France 2. UMR 1220 TCEM (ENITAB), 1 cour du Général de Gaulle, BP 201, 33175, Gradignan Cedex, France 3. UR 1263 EPHYSE (INRA), 69 route d’Arcachon, 33612, Cestas Cedex, France
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Abstract: | European gorse (Ulex europaeus L.) N2 fixation rate (%Ndfa) was studied in a maritime pine (Pinus pinaster Aït.) oligotrophic forest. Fertilization field trials were carried out on 5 sites with various inputs of phosphorus (0–240 kg P2O5·ha?1). Seven to ten years after pine planting, gorse were sampled to evaluate the effect of P fertilization on gorse %Ndfa, determined using the 15N natural abundance method. One of the prerequisites of this method is the existence of a significant difference between the 15N/14N ratios in the atmospheric N reference and in the stand soil N references. This prerequisite was satisfied for 80 of 120 cases. The average %Ndfa was high (70 ± 3%) but with high local variability. No significant difference in %Ndfa was detected among P treatments. Nitrogen concentration of gorse was significantly higher in the highest dose treatments compared to the control. |
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