Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4759416 | Forest Ecology and Management | 2017 | 13 Pages |
Abstract
Leaf litter accounted for the largest (44-61%) annual organic C input to soil, the fine roots contributed with 12-32% and the herbaceous understorey (aboveground + belowground), with 14-26% to it. Annual cumulative soil heterotrophic respiration (Rh) in the studied stands ranged between 2.6 and 5.8 t C haâ1 yrâ1; C leaching was negligible, being 10-30 kg C haâ1 yrâ1. The C sequestration to soil depended on previous land use; in the first forest generation, i.e. a stand growing on previous agricultural land, the annual Corg input into soil exceeded Rh, which indicated C accumulation in soil. Although grey alder stands are generally C accumulating ecosystems, the annual biomass production of the studied stands was highly variable; thus annual NEP depended on the effect of the year rather than on stand age. The current study demonstrates that use of repeated time-series measurements applied for stands of different development stages can provide more detailed estimation of C accumulation in forest ecosystems.
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Authors
V. Uri, M. Kukumägi, J. Aosaar, M. Varik, H. Becker, K. Soosaar, G. Morozov, K. Ligi, A. Padari, I. Ostonen, K. Karoles,