Primary vegetation succession and the serpentine syndrome: the proglacial area of the Verra Grande glacier, North-Western Italian Alps
Initial stages of pedogenesis are particularly slow on serpentinite. This implies a slow accumulation of available nutrients and leaching of phytotoxic elements. Thus, a particularly slow plant primary succession should be observed on serpentinitic proglacial areas. The observation of soil-vegetation relationships in such environments should give important information on the development of the “serpentine syndrome”.
Plant-soil relationships have been statistically analysed, comparing morainic environments on pure serpentinite and serpentinite with small sialic inclusions in the North-western Italian Alps.
Results and conclusions
Pure serpentinite supported strikingly different plant communities in comparison with the sites where the serpentinitic till was enriched by small quantities of sialic rocks. While on the former materials almost no change in plant species composition was observed in 190 years, 4 different species associations were developed with time on the other. Plant cover and biodiversity were much lower on pure serpentinite as well. Extremely low P and high Ni contents in soil were strongly related with these differences, but none of them could be interpreted as the actual limiting factor for plant development on pure serpentinite. Other nutrients or bases were not related with the different primary succession speed and species composition.
KeywordsEndemic species Glacier forefield Moraines, Nickel Phosphorus
This study was performed thanks to the research agreement between the University of Turin, NATRISK centre, and Regione Autonoma Valle d’Aosta, department of soil defense and hydraulic resources. This research was supported by the Italian MIUR Project (PRIN 2010–11; grant number 2010AYKTAB_006): “Response of morphoclimatic system dynamics to global changes and related geomorphological hazards” (national coordinator C. Baroni).
- Andreis C, Caccianiga M, Cerabolini B (2001) Vegetation and environmental factors during primary succession on glacier forelands: some outlines from the Italian Alps. Annu Rev Plant Biol 135(3):295–310Google Scholar
- Baumbach H (2012) Metallophytes and metallicolous vegetation: evolutionary aspects, taxonomic changes and conservational status in Central Europe. In: Tiefenbacher J (ed) Perspectives on nature conservation—patterns, pressures and prospects. Tech, Rijeka, pp 93–118Google Scholar
- Breimann L (2001) Random forests. Mach Learn 45:15–32Google Scholar
- Brooks RR (1987) Serpentine and its vegetation: a multidisciplinary approach. Dioscorides, OregonGoogle Scholar
- FAO (2006) Guidelines for soil description, 4th edn. FAO, RomeGoogle Scholar
- FAO-ISRIC (2014) World reference base for soil resources 2014. World Soil Resources Reports No. 103. FAO, RomeGoogle Scholar
- Hastie TJ, Tibshirani RJ (1990) Generalized additive models. Monographs of Statistics and Aplied Probability 43Google Scholar
- Hennig C (2007) Cluster-wise assessment of cluster stability. Comp Stat Data Anal 53:258–271Google Scholar
- Jenny H (1980) The soil resource: origin and behavior. Ecol Stud 37:256–59Google Scholar
- Kruckeberg AR (1954) The ecology of serpentine soils III. Plant species in relation to serpentine soils. Ecology 35:267–274Google Scholar
- Landolt E (1977) Ökologische Zeigerwerte zur Schweizer Flora, 64. Veröffentlichungen des Geobotanischen Institutes der Eidgenössischen Technischen Hochschule. Stiftung Rübel, ZürichGoogle Scholar
- Liaw A, Wiener M (2002) Classification and regression by random forest. Rnews 2:18–22Google Scholar
- Matthews JA (1992) The ecology of recently-deglaciated terrain. A geoecological approach to glacier forelands and primary succession. Cambridge University Press, CambridgeGoogle Scholar
- Mattirolo E, Novarese V, Franchi S, Stella A (1951) Carta Geologica d’Italia 1:100000, foglio 29. Istituto Geografico Militare, FirenzeGoogle Scholar
- Mercalli L (2003) Atlante climatico della Valle d’Aosta. Società Meteorologica Italiana, TorinoGoogle Scholar
- Oksanen J, Blanchet FG, Kindt R, Legendre P, O’Hara RB, Simpson GL, Solymos P, Stevens MHH, Wagner H (2011) vegan: Community Ecology Package. R Package Version 2.0-0. http://CRAN.Rproject.org/package=vegan. Accessed 21 April 2013
- Pignatti S (1992) Flora d’Italia, vol 1–3. Edagricole, BolognaGoogle Scholar
- Rajakaruna N, Boyd R (2008) The edaphic factor. In Encyclopaedia of Ecology. Vol. 2. Ed. S E Jorgensen SE, F B Fath B, pp. 1201–1207Google Scholar
- Richard JL (1985) Observations sur la sociologie et l’écologie de Carex fimbriata Schkuhr dans les Alpes. Bot Helv 95(2):157–164Google Scholar
- Schimmelpfennig I, Schaefer JM, Akçar N, Koffman T, Ivy-ochs S, Schwartz R, Finkel RC, Zimmermann T (2014) A chronology of Holocene and little Ice Age glacier culminations on the Steingletscher, central Alps, Switzerland, based on high-sensitivity beryllium-10 moraine dating. Earth Plan Sci Lett 393:220–230CrossRefGoogle Scholar
- Ugolini FC (1966) Part 3. Soils. In: Mirskey A (Ed) Soil development and ecological succession in a deglaciated area of Muir Inlet, southeast Alaska. Institute of Polar Studies report Number 20, Ohio State University, Columbus, USAGoogle Scholar
- van Reeuwijk LP (2002) Procedures for Soil Analysis. Technical Paper n. 9. International Soil Reference and Information Centre, Wageningen, NetherlandsGoogle Scholar