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1 August 2004 Biomass distribution of two subalpine dwarf-shrubs in relation to soil moisture and nutrient content
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Question: Do soil water content and/or soil nitrogen (N) content and/or soil phosphorus (P) content affect the biomass of Vaccinium myrtillus and V. vitis-idaea in a sub-alpine heath?

Location: Dolomites, northern Italy, 1800 m a.s.l.

Methods: We determined above-ground and below-ground biomass of the shrubs at three sites, each on a different substrate type. At each site, we determined soil N- and P-contents. We also determined leaf water potential (ψl), N- and P-concentrations in plant tissues and litter, as well as δ13C and δ15N in mature leaves.

Results: V. myrtillus biomass was highest at the silicate site, V. vitis-idaea biomass was highest at the carbonate site. Both shrubs had low biomass at the peat site, possibly due to a toxic effect of waterlogging in wet soils. For both species, pre-dawn ψl indicated optimal hydration and midday ψl did not show any sign of water stress. Water use efficiency (WUE) did not differ among sites for any species. Whole-plant nutrient concentrations showed that, with increasing biomass, N was diluted in V. myrtillus tissues while P was diluted in V. vitis-idaea tissues. Foliar N-concentration was higher overall for V. myrtillus. Foliar P-concentration in V. myrtillus peaked at the silicate site. Foliar N : P ratios suggested that V. myrtillus was primarily P-limited and V. vitis-idaea primarily N-limited.

Conclusions: Water content affected the distribution of the two shrubs in a similar way, higher P-availability in the soil enhanced V. myrtillus rather than V. vitis-idaea.

Abbreviations: SOM = Soil organic matter; WUE = Water use efficiency.

Renato Gerdol, Tommaso Anfodillo, Matteo Gualmini, Nicoletta Cannone, Luca Bragazza, and Lisa Brancaleoni "Biomass distribution of two subalpine dwarf-shrubs in relation to soil moisture and nutrient content," Journal of Vegetation Science 15(4), 457-464, (1 August 2004).[0457:BDOTSD]2.0.CO;2
Received: 5 February 2003; Accepted: 18 December 2003; Published: 1 August 2004

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