Potential of producing wood biomass in short rotation grey alder (Alnus incana Moench) plantations on agricultural lands
2015
Daugaviete, M., Latvian State Forest Research Inst. Silava, Salaspils (Latvia) | Bardulis, A., Latvian State Forest Research Inst. Silava, Salaspils (Latvia) | Daugavietis, U., Latvian State Forest Research Inst. Silava, Salaspils (Latvia) | Lazdina, D., Latvian State Forest Research Inst. Silava, Salaspils (Latvia) | Bardule, A., Latvian State Forest Research Inst. Silava, Salaspils (Latvia)
The paper describes the potential of producing wood biomass in short rotation tree plantations (rotation period 5, 10 and 15 years) on agricultural lands. The research is focused on managing naturally emerging grey alder (Alnus incana Moench) coppice on agricultural lands, following up its course of growth and estimating the volume of biomass to be recovered. Grey alder as a fast-growing specie is suitable for short-rotation plantation cultivation in sites of nutrient-rich soils (site index H20=12m). Coppice of grey alder between the age of 5 and 15 years may be cultivated as a short-rotation plantation with the biomass yield depending on growing conditions from 20 to 445 loose m3 haE-1 and gross income between 189 and 4201 EUR haE-1. In grey alder plantations of site index H20=12, H20=16 and H20=20 you may already at the age of 10 to 15 years harvest pulpwood (top diameter 7 cm under bark), packaging wood and fuelwood; the amount to be obtained depends on the intensity of thinnings done in age class I. As follows from the results, the average volume of fresh biomass in one year-old untended coppice of grey alder varies from 1.43 t haE-1 to 11.15 t haE-1 with the mean shoot height Hv=1.4 m and highly variable number of stems per unit area. In two-year old stands this variation is from 5.27 t haE-1 to 28.50 t haE-1 with the mean stem height Hv=2.5 m; in three-year old stands – from 7.95 t haE-1 to 36.60 t haE-1 (mean height Hv=3.0 m); in four-year old stands – from 18.83 t haE-1 to 52.80 t haE-1 (mean height Hv=4.4 m); in five-year old stands – from 22.91 t haE-1 to 64.23 t haE-1 (mean height Hv=4.8 m).
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