Vegetation-based bioindication of humus forms in coniferous mountain forests Vegetation-based bioindication of humus forms in coniferous mountain forests

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Vol14 No.4: 662-673

Title】Vegetation-based bioindication of humus forms in coniferous mountain forests

Author】Kerstin ANSCHLAG1*; Dylan TATTI2,3; Niels HELLWIG1; Giacomo SARTORI4; Jean-Michel GOBAT2; Gabriele BROLL1

Addresses】1 Institute of Geography, University of Osnabrueck, Seminarstraße 19ab, 49074 Osnabrueck, Germany, 2 Functional Ecology Laboratory, University of Neuchâtel, Rue Emile-Argand 11, 2000 Neuchâtel, Switzerland, 3 School of Agricultural, Forest and Food Sciences HAFL, Bern University of Applied Sciences, Länggasse 85, 3052 Zollikofen, Switzerland, 4 MUSE, Corso del Lavoro e della Scienza 3, 38122 Trento, Italy

Corresponding author】

Citation】Anschlag K, Tatti D,Hellwig N, et al. (2017)Vegetation-based bioindication of humus forms in coniferous mountain forests. Journal of Mountain Science 14(4). DOI: 10.1007/s11629-016-4290-y


Abstract】Humus forms, especially the occurrence and the thickness of the horizon of humified residues (OH), provide valuable information on site conditions. In mountain forest soils, humus forms show a high spatial variability and data on their spatial patterns is often scarce. Our aim was to test the applicability of various vegetation features as proxy for OH thickness.  Subalpine coniferous forests dominated by Picea abies (L.) H. Karst. and Larix decidua Mill. were studied in the Province of Trento, Italian Alps, between ca. 900 and 2200 m a.s.l. Braun-Blanquet vegetation relevés and OH thickness were recorded at 152 plots. The vegetation parameters, tested for their suitability as indicators of OH thickness, encompassed mean Landolt indicator values of the herb layer (both unweighted and cover-weighted means) as well as parameters of vegetation structure (cover values of plant species groups) calculated from the relevés. To our knowledge, the predictive power of Landolt indicator values (LIVs)for humus forms had not been tested before.Correlations between OH thickness and mean LIVs were strongest for the soil reaction value, but indicator values for humus, nutrients, temperature and light were also significantly correlated with OH thickness. Generally, weighting with species cover reduced the indicator quality of mean LIVs for OH thickness. The strongest relationships between OH thickness and vegetation structure existed in the following indicators: the cover of forbs (excluding graminoids and ferns) and the cover of Ericaceae in the herb layer. Regression models predicting OH thickness based on vegetation structure had almost as much predictive power as models based on LIVs. We conclude that LIVs analysis can produce fairly reliable information regarding the thickness of the OH horizon and, thus, the humus form. If no relevé data are readily available, a field estimation of the cover values of certain easily distinguishable herb layer species groups is much faster than a vegetation survey with consecutive indicator value analysis, and might be a feasible way of quickly indicating the humus form.

Keywords】Landolt indicator values;OH horizon;Forest ecosystem;Montane forest, Italian Alps