The estimation of aboveground biomass and nutrient pools of understorey plants in closed Norway spruce forests and on clearcuts |
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| Authors: | Steffi Heinrichs Markus Bernhardt-Römermann Wolfgang Schmidt |
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| Institution: | 1.Department Silviculture and Forest Ecology of the Temperate Zones, Faculty of Forest Sciences and Forest Ecology,Georg-August University G?ttingen,G?ttingen,Germany;2.Department of Ecology and Geobotany,Goethe-Universit?t Frankfurt am Main,Frankfurt am Main,Germany |
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| Abstract: | The estimation model PhytoCalc allows a non-destructive quantification of dry weight and nutrient pools of understorey plants
in forests by using the relationship between species biomass, cover and mean shoot length. The model has been validated with
independent samples in several German forest types and can be a useful tool in forest monitoring. However, in open areas within
forests (e.g. clearcuts), the current model version underestimates biomass and produces unreliable nutrient pool estimations.
Thus, tissue density, as approximated by leaf dry matter content (LDMC), is systematically higher under high light compared
to low light conditions. We demonstrate that the ratio of LDMC under clearcut conditions to LDMC under forest conditions can
be used to adjust the PhytoCalc model to clearcut conditions. We investigated the LDMC ratio of five exemplary species commonly
occurring on clearcuts. Integrating the square of the ratio as a correction factor improved estimates of biomass to more than
70% fit between observations and predictions. Results also suggest this ratio can be used to correct nutrient concentrations
modelled in PhytoCalc, which tend to be overestimated in clearcuts. As morphological groups of plant species exhibit significantly
different ratios, we advise using group-specific correction factors for clearcut adjustments in the future. |
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