Abstract
Nitrogen leaching persists in mountain forests of Europe even in the presence of decreasing N depositions. We have hypothesized that this leaching is linked to soil N transformations occurring over the whole year, even at 0°C temperatures. The aims were to estimate (1) the effect of temperature on N transformations and (2) N pools and fluxes. The study sites are situated in the Bohemian Forest (Czech Republic). Litter, humus, and 0–10-cm mineral layers were sampled in early spring, and the effect of temperature on net nitrification, net ammonification, and microbial N immobilization were measured in a short-term incubation experiment without substrate addition. Nitrogen pools were calculated from the concentrations of N forms in the soil and soil pool weights, while daily N fluxes were calculated from daily net rates of processes and soil pool weights. Relationships between temperature and net nitrification, net ammonification, and microbial N immobilization did not follow the Arrhenius type equation; all processes were active close to 0°C, indicating that microbial N transformations occur over the whole year. Microbial N immobilization rate was generally greater than N mineralization rate. The microbial N pool was significantly larger than mineral N pools. Organic layers containing tens of grams of available N per square meter contributed more than 70% to the available N in the soil profile. Daily N fluxes were related to N pools. On average, N fluxes represented daily mineral and microbial N pool changes of 1.14 and 1.95%, respectively. The effect of microbial composition on the C/N ratio of microbial biomass and respiration is discussed.
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Acknowledgment
This study was supported by project GA CR 206/07/1200, MSM 6007665801, and project CZ 0051 (01-04/05-081 IP-65 MZP). We acknowledge the laboratory and field assistance provided by our colleagues and students, the contribution by Keith Edwards for language correction, and the contribution by the Editor-In-Chief for improving the style of the manuscript. We also thank the authorities of both NP and CHKO Šumava for the permission to carry out this study.
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Šantrůčková, H., Tahovská, K. & Kopáček, J. Nitrogen transformations and pools in N-saturated mountain spruce forest soils. Biol Fertil Soils 45, 395–404 (2009). https://doi.org/10.1007/s00374-008-0349-4
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DOI: https://doi.org/10.1007/s00374-008-0349-4