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Forestry Advance Access originally published online on September 26, 2008
Forestry 2009 82(1):61-74; doi:10.1093/forestry/cpn040
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© Institute of Chartered Foresters, 2008. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The dynamics of biomass production in relation to foliar and root traits in a grey alder (Alnus incana (L.) Moench) plantation on abandoned agricultural land

Veiko Uri1,*, Krista Lõhmus2, Andres Kiviste1 and Jürgen Aosaar1

1 Department of Silviculture, Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, 51014 Tartu, Estonia
2 Department of Botanys Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, 51005 Tartu, Estonia

* Corresponding author. E-mail: veiko.uri{at}emu.ee


  Abstract

The dynamics of the above-ground biomass production of a grey alder plantation on abandoned farmland was investigated during 11 years after establishment. In the 12-year-old stand, the total biomass of the above-ground part of the stand was 68.8 t dry matter (DM) ha–1 and the current annual production (CAP) was 14.0 t DM ha–1 year–1. The predicted mean annual increment (MAI) reached is maximum at the age of 16 years, which indicates bulk maturity (the stand age when CAI = MAI) and appropriate rotation time for obtaining maximum biomass production. In the case of short-rotation forestry, initial stand density should not be higher than 6500–6000 trees per hectare. Below-ground biomass accounted for 18 and 16 per cent of total stand biomass at a stand age of 5 and 10 years, respectively. The biomass of the nodules was estimated at 155 ± 63 kg DM ha–1 and the biomass of the fine roots was estimated at 870 ± 130 kg DM ha–1 in the 10-year-old grey alder stand. Of the fine roots, 80 per cent and almost all nodules were located in the upper 0–20 cm soil layer in both the 5-year-old and the 10-year-old stand. The value of leaf area index increased with stand age, ranging between 1.38 and 5.43 m2 m–2 during the development of the stand. Specific leaf area varied in different years from 11.1 to 13.5 m2 kg–1.

Received 31 October 2007.
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