Lauren（eの頭に´）,A., Lappalainen,M., Saari,P., Kukkonen,J.V.K., Koivusalo,H., Piirainen,S., Setala（両方のaの頭に¨）,H., Sarjala,T., Bylund,D., Heinonen,J., Nieminen,M., Palviainen,M., Launianen,S. and Finer（eの頭に´）,L.(2012): Nitrogen and carbon dynamics and the role of enchytraeid worms in decomposition of L, F and H layers of boreal mor. Water Air Soil Pollut., 223, 3701-3719.

『北方粗腐植のL層・F層・H層の分解における窒素と炭素のダイナミクスおよびヒメミミズの役割』

『Abstract
　Decomposition of organic material releases carbon dioxide (CO2) into the atmosphere, and dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and ammonium (NH4-N) into soil water. Each of the decomposition products contributes differently to overall export of carbon (C) and nitrogen (N) to water courses. Our aim was to study the quantity and composition of the released C and N as affected by the organic mineral and soil fauna, represented by enchytraeid worms. We measured the release rate of carbon dioxide, and calculated the release rates for DOC and dissolved N in soil from repeated measurements of DOC and n pools during laboratory incubation of litter (L), fermented (F) and humus (H) layers of boreal forest mor. The intermediate decomposition products, DOC and DON, were characterised according to the molecule size. The release rate of the decomposition products was higher for fresh than for old organic material. The majority of N and C were released as NH4-N and CO2, respectively. The amount of extractable organic N in soil decreased by time but DON increased. Rnchytraeids stimulated N mineralisation and the release of large molecule size DOC, particularly in L layer. The results suggest that organic N in extractable from biodegrades effectively, and that soil fauna have an important role in the decomposition. The results were interpreted from the water quality point of view and the implications of the results to modelling of decomposition and export of DOC and dissolved N to recipient water bodies are discussed. In the modelling context, the novelty of the study is the description of the intermediate decomposition products and the division of the dissolved organic compounds into low molecular weight and high molecular weight fractions.

Keywords: Ammonium; Carbon dioxide; Dissolved organic carbon; Dissolved organic nitrogen; Nitrate; Soil fauna』

1. Introduction
2. Materials and methods
　2.1. Conceptualisation of N and C processes in the experiment
　2.2. Study site and sampling
　2.3. Incubation experiment
　2.4. Data processing and statistical methods
3. Results
　3.1. Release of N and C from L, F and H layers
　3.2. Role of enchytraeids in the release of N and C
4. Discussion
　4.1. N and C dynamics in the incubation experiment
　4.2. Implications to the decomposition modelling and export of N and C
5. Conclusion
Acknowledgments
References

戻る