NDLI: Nitrogen transformations and pools in N-saturated mountain spruce forest soils

Content Provider	Springer Nature Link
Author	Šantrůčková, Hana Tahovská, Karolina Kopáček, Jiří
Copyright Year	2008
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.
Starting Page	395
Ending Page	404
Page Count	10
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	45
Issue Number	4
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-12-24
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Temperature Microbial N immobilization Net nitrification Net ammonification N pools Soil Science & Conservation Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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