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Nitrogen and Phosphorus Budgets in Experimental Grasslands of Variable Diversity

^a Inst. of Ecology, Dep. of Soil Science, Berlin Univ. of Technology, Salzufer 11-12, D-10587 Berlin, Germany
^b Geographic Inst., Professorship of Soil Geography/Soil Science, Johannes Gutenberg Univ., Johann-Joachim-Becherweg 21, D-55128 Mainz, Germany
^c Inst. of Geography, Friedrich Schiller Univ., Löbdergraben 32, D-07743 Jena, Germany
^d Inst. of Chemistry and Dynamics of the Geosphere, ICGIII Phytosphere Inst., Jülich Research Centre, D-52425 Jülich, Germany
^e Inst. of Plant Sciences, ETH Zentrum LFW C56, Universitätsstrasse 2, CH-8092 Zurich, Switzerland
^f Max Planck Inst. for Biogeochemistry, P.O. Box 100164, D-07701 Jena, Germany
^g Inst. of Ecology, Friedrich Schiller Univ. of Jena, Dornburger Straße 159, D-07743 Jena, Germany

View larger version (47K): [in this window] [in a new window]   Fig. 1. Conceptual diagram of the in- and outputs in the studied grassland. BD = bulk deposition (wet and coarse particulate); DD = dry deposition (fine particulate); M = mowing; sLEA = leaching from soil; fixN = fixation of atmospheric N2; gLOSS = gaseous N loss.

View larger version (20K): [in this window] [in a new window]   Fig. 2. Nitrogen and P balance including total deposition, N fixation (based on N yield of legumes), mowing, and leaching from soil. Gaseous N losses as NOx or N2O were supposed to be negligible.

View larger version (11K): [in this window] [in a new window]   Fig. 3. Relationship between total biomass produced in 2003 and net N and P budgets. N: r = 0.83, p < 0.001; P: r = 0.96; p < 0.001.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Relationship between total biomass produced in 2003 and throughfall deposition (TFD) and leaching from the canopy (cLEA) of N (a, c) and P (b, d). TFD P: r = 0.57, p < 0.01; cLEA P: r = 0.56; p < 0.01.

View larger version (29K): [in this window] [in a new window]   Appendix 2: Design of Block 2 of the experimental site.