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1

Litter production and composition in natural stands of Quercus robur L. [Galicia, Spain]

100%
Diaz-Maroto I. J., Vila-Lameiro P.
Polish Journal of Ecology
|
2006
|
tom 54
|
nr 3
Litter production is essential for transfer of energy and nutrients from plant to soil. This paper aims to relate the phenology of litterfall by common oak (Quercus robur L.) to specific climatic factors. Over three years, two natural stands of Quercus robur (Cerceda with latitude 43°11’N and longitude 8°28’W and Lourizán with latitude 42°25’N and longitude 8°40’W) near to fifty years old and located in Galicia, Northwest of Spain, were thoroughly studied in the period 1992–1994. The litter was collected in five litter traps (0.5 m wide, 20 cm high) located within a plot of 100 m². Annual litterfall values were similar in both stands, being approximately between 6 and 11 Tm·ha⁻¹ (dry weight); the southern stand showed a higher interannual variability. The leaf fraction accounted for the highest percentage of total litter production. Usually it represents more than 70% of annual production, but it has been exceeded by fruits production in the corresponding season (spring in the north and summer in the south). The climatic parameters that had the greatest influence on litter production were total precipitation and absolute maximum temperature with a correlation always higher than 65%. It allows to link litter production with climate parameters with an adjusted correlation coefficient around 70 %, even more in the south plot (Lourizán). With an easy ANOVA analysis it is possible to distinguish the season with greater litter production; it is the autumn in all cases except fruits production as was said above.
2

Natural forests of Quercus robur L. in Northwest Spain - main properties of soils

100%
Diaz-Maroto I. J., Vila-Lameiro P.
Polish Journal of Ecology
|
2007
|
tom 55
|
nr 2
The main properties of the soils under oak (Quercus robur L.) forests in Galicia (NW Spain) were characterized. Eleven edaphic parameters (pH, OM, N, C/N ratio, P, K, Ca, Mg, sand, silt and clay) were estimated in 39 soil samples. Siliceous substrates were present in all stands and the soils were found to be the cambisols. The values of chemical parameters are similar to those considered as the optimal ones by other authors (i.e., average pH close to 5, average C/N ratio close to 15) with the exception of the organic matter which is slightly higher; the average value is equal to 8.64 ± 5.19. The content of nutrients can be considered as the low or medium (for instance, the potassium is only 73 ppm) as compared with other forests in the study area, except the content of phosphorus, which is considerably higher (21.8 ppm versus 1–6 ppm).
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