Competitive patterns of N partitioning between plants and microorganisms in intact plant-soil-systems

我们对生态系统氮循环过程的认识在很大程度上是伪造的忽视植物-微生物的相互作用和竞争的N，地下N通量的空间和时间的巨大变化。为了阐明竞争模式的N分配山毛榉和微生物及其对环境条件变化的响应，稳定同位素（15 N，13 C）将遵循田间试验，蒸渗仪和微观宇宙研究通过植物-土壤系统。三重标记的方法（15 N/13 C维生素，15 NH 4+，15 NO3-）在微型蒸渗仪结合15 N示踪建模将允许同时模拟完整的植物-土壤系统中的主要N通量，从而以过程为导向的方式表征植物-微生物竞争。此外，N2和N2 O排放量从完整的土壤芯将直接测量，以量化的反硝化作用的NO3 -的竞争中的作用。近红外光谱（NIRS）将被用来测量竞争的N与高分辨率的指标，以克服高的时间和空间变化的N通量和竞争格局的N分配。

Our knowledge on ecosystem N cycling processes is largely falsified by the disregard of plant-microbe interactions and -competition for N, and by the enormous variability of belowground N fluxes in space and time. To elucidate competitive patterns of N partitioning between beech and microorganisms and its responses to changing environmental conditions, stable isotopes (15N, 13C) will be followed in field experiments, lysimeter and microcosm studies through the plant-soil system. Triple labelling approaches (15N/13C glutamin, 15NH4 +, 15NO3 -) in mini-lysimeters in combination with 15N tracing modelling will allow to simultaneously mimic major N fluxes in intact plant-soil systems, and thus, to characterize plant-microbe competition in a process-oriented way. Furthermore, N2 and N2O emissions from intact soil cores will be measured directly in order to quantify the role of denitrification in the competition for NO3 - . Near infrared spectroscopy (NIRS) will be used to measure indicators of competition for N with high resolution in order to overcome the high temporal and spatial variation of N fluxes and competitive patterns of N partitioning.