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Allometric models of foliage biomass in Scots pine (Pinus sylvestris L.)

100%

Jelonek T., Pazdrowski W., Walkowiak R., Arasimowicz-Jelonek M., Tomczak A.

Polish Journal of Environmental Studies

2011

tom 20

nr 2

Presented analyses were connected with modelling foliage biomass of Scots pine (Pinus sylvestris L.) growing in northern and western Poland. In order to realize the study, a total of 38 one-hectare experimental plots were established in commercial pine monocultures growing on sites optimal for this species at a given geographical location. A total of 114 trees aged 32-114 years were felled and their needle weight and the weight of needles and young, 1-year old twigs were measured. Since social variation in the stand could affect the fit of the model, for each social class of tree position an individual allometric equation was proposed, based on easily measurable biometric traits of trees. Analysis of stepwise backward regression was conducted in order to determine variables in these equations. It turned out that to estimate foliage biomass of predominant and dominant trees, it seems most appropriate to apply diameter at breast height and tree age. In turn, for co-dominant trees, apart from diameter at breast height and tree age, the model needs to include additionally tree height and crown length. Moreover, due to the fact that the dependence between needle weight and the weight of needles and young twigs is practically linear, prediction was conducted for the biomass of foliage with young twigs. From the practical point of view, this makes it possible to precisely determine needle biomass on the basis of the weight of needles with young, 1-year-old shoots.

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Accumulation and retranslocation of nitrogen and phosphorus in the foliage of Pinus sylvestris L. and Betula pubescens in chosen woodland ecosystems of the Slovinski National Park

100%

Parzych A., Trojanowski J., Sobisz Z.

Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

2010

tom 14

The study of foliage was carried out in two different forest ecosystems: Vaccinio uliginosi- Betuletum pubescentis and Empetro nigri-Pinetum in the Slovinski National Park in the period of 2002-2005. The largest volume of nitrogen and phosphorus in the litter of coniferous needles was found in early summer at the moment of maximum growth. An average concentration of nitrogen in examined needles was between 1.296% and 1.358% N in Vaccinio uliginosi-Betuletum pubescentis and from 1.010% to 1.118% N in Empetro nigri-Pinetum. The decrease of biogenes concentration in plant tissues was observed in the autumn months as a result of lower demand and recession of biogenes connected with storage of valuable elements in the fatter parts of the trees. In the fall season, a gradual recession of nutrients from the litter of coniferous needles was observed. In Vaccinio uliginosi-Betuletum pubescentis insignificant quantity of nitrogen recesses (average 5.6%) from the new and one year old litter of coniferous needles, including 47.2% N-NH4 and 78.6% N-NO3 and about 21.8% P, including 11.7% P-PO4. In Empetro nigri-Pinetum more intensive recession of biogenes was found from the litter of coniferous needles of common pine than in Vaccinio uliginosi-Betuletum pubescentis. On average 11.5% T-N is translocated, including 41.4% N-NH4 and 23.8% N-NO3 as well as 22.3% P, including 11.8% P-PO4.

Ograniczanie wyników

1 Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline

1 Polish Journal of Environmental Studies

1 Arasimowicz-Jelonek M.

1 Jelonek T.

1 Parzych A.

1 Pazdrowski W.

1 Sobisz Z.

1 Tomczak A.

1 Trojanowski J.

1 Walkowiak R.

1 2011

1 2010

Wyniki wyszukiwania

Allometric models of foliage biomass in Scots pine (Pinus sylvestris L.)

Accumulation and retranslocation of nitrogen and phosphorus in the foliage of Pinus sylvestris L. and Betula pubescens in chosen woodland ecosystems of the Slovinski National Park