Ecological Research Projects Research Focus Topics Research Question

Ecological Research Projects • Research /Focus /Topics • Research Question: general/specific /conceptual Model • Define Set of Working Hypotheses • Experimental Approach/Experimental Design/Methods • Prelim. Experiment + Evaluation • Main Experiment • Evaluation Data Mining / Evaluation of Hypothesis New Results / Findings • Clarifying Exp. / Follow up Exp. Modification of main Exp. • Final Evaluation /Synthesis • (Conceptual) Modelling, Discussion (Eval. of Hypothesis) • Conclusions / Definition of next Research Needs

Vegetation Substrates (Sugars, Amino Acids, Organic Acids) Microbial Activity (Soil Enzymes) Gas Exchange (N 2 O, CO 2, CH 4, C 2 H 2) Microbial Biodiversity (PLFA)

inhibition p. H N/C substrate supplement Mi. O enzyme original pool mass flow influence additional (RESP) CO 2 basal (BR) stimulating or inhibiting effects: enzyme activation / inhibition enzyme induction / repression abundance change diversification adaptations long term effects (succession) investigated system

Water Fertilizer Shoot Litter Root H 2 O Mi. O SIR Remin NH 4 WRC Ext Enz Urease Soil System KI+_p. H KEC

N-Turnover in Soils hn N atmosph. PLANT Rhizodeposition, Litter Free Amino Acids Feedback POM DOM Protease BR, SIR MESOFAUNA Mi. O NH 4+ Urease NO 3 Steering influence Mass Transfer

LOLIUM hv CO 2 = Massentranfer = Steuergröße POM DOM Pilze CO 3 -- Mg++ Bakterien Fauna Mg. CO 3 Urease Aktivität ges. N

TRIFOLIUM = Massentranfer = Steuergröße hv CO 2 N 2 Kn. Bak. POM DOM org. S Pilze Mg CO -3 ++ Bakterien Fauna Mg CO 3 Urease Aktivität ges. N