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1

Dynamics of soil and fertiliser nitrogen in arable systems

100%
Recous S.
Nawozy i Nawożenie
|
2001
|
tom 03
|
nr 4[09]
2

Decomposition rate, and carbon and nitrogen dynamics of Sphagnum litter: lessons from a peat bog

84%
Peli E. R., Nagy J., Cserhalmi D.
Polish Journal of Ecology
|
2016
|
tom 64
|
nr 2
Decomposition rates and changes of carbon and nitrogen contents of Sphagnum litter in mire vegetation can help to explore the ecological effects of climate change and the role of environmental factors from a local to an ecosystem scale. The objective of the study was to determine the relationship between mentioned parameters in small and isolated Sphagnum dominated mires. Measurements had been conducted throughout a year by placing litterbags filled with Sphagnum biomass in three vegetation types (open peat bog, poor fen, alder carr) of a mire ecosystem in Hungary. Peat decomposition rates differed to a great extent; the slowest decomposition rate (39.1±9.52%) was in the alder carr, indicating that slower decomposition could be characteristic for this kind of vegetation type of mire. Between Sphagnum dominated microhabitats, open peat bog showed medium (65.57±4.05) while poor fen the fastest (68.61±5.5) rates in decomposition. The C/N ratio of the Sphagnum litter showed significant decrease (P <0.005) in all studied micro-environments. Slower N release was observed from litter of Alnus dominated association (31.3±6.9%) compared to Sphagnum dominated ones (56.5±8.3%). Our findings showed that the decomposition rates were more dependent on vegetation type than C/N ratio and this relationship was also revealed at a small spatial scale.
3

Night-time CO2 chamber measurements in peatland ecosystem in Poland

67%
Juszczak R., Acosta M., Michalak M., Chojnicki B. H., Urbaniak M., Drosler M., Augustin J., Olejnik J.
Acta Agrophysica. Rozprawy i Monografie
|
2010
|
nr 2[179]
4
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Comparison of soil CO2 efflux rates in Larix leptolepis, Pinus densiflora and P. rigitaeda plantations in southern Korea

67%
Kim C., Jeong J.
Dendrobiology
|
2016
|
tom 76
This study compared soil CO2 efflux rates in three adjacent coniferous plantations consisting of larch (Larix leptolepis Gordon), red pine (Pinus densiflora S. et Z.) and rigitaeda pine (P. rigitaeda: P. rigida Mill × P. taeda L.) species planted in the same year (1963). Soil CO2 efflux, litter fall carbon (C) and root decomposition rates were measured with soil environmental factors for two years. The mean annual soil CO2 efflux rates (g CO2 m−2 hour−1) were the highest in rigitaeda pine (0.30), followed by red pine (0.27) and larch (0.24) plantations. An exponential regression of the CO2 efflux rates against their corresponding soil temperatures showed a significant (P < 0.05) relationship (red pine R2 = 0.69; rigitaeda pine R2 = 0.67; larch R2 = 0.63). The soil CO2 efflux rates were negatively correlated with soil pH, but the soil water and soil organic C content were not significantly correlated with the CO2 efflux rates. Soil CO2-C efflux rates were correlated by litter fall C inputs in the larch and red pine plantations, and the decomposition rates of 5–10 mm diameter roots in the larch plantation. This result is useful in understanding potential responses of soil CO2 efflux rates with changes in stand and soil environmental factors induced by different tree species.
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