dynamics of soil chemistry in different serpentine habitats from serbia
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2014
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Abstract
To enhance understanding of edaphic conditions in serpentine habitats, a
thorough investigation of chemical and mechanical properties of three soils
from disjunct ultramafic outcrops in the central Balkans was undertaken. Soil
from a nearby chemically-contrasting limestone habitat was also analyzed.
Three plant species differently associated with serpentine (Halacsya
sendtneri, Cheilanthes marantae, and Seseli rigidum) were references for site
and soil selection. Twenty elements were scanned for, and fourteen were
measured in seven sequentially-extracted soil fractions. Quantified soil
properties also included: pH, levels of free CaCO3, organic matter, P2O5,
K2O, N, C, S, cation exchange capacity, total organic carbon, field capacity
and soil mechanical composition. The usual harsh components for plant growth
in serpentine soil such as elevated Mg:Ca ratio, high levels of Ni, Cr, or
Co, were significantly lower in the available fractions. There was a
significant positive correlation of organic matter and field capacity, with
most available Ca (70-80%) found in the mobile, rather than the
organically-bound fraction. This showed that a more favorable Mg:Ca ratio is
highly dependent upon a higher field capacity, which is also in accordance
with a more developed vegetation. Increasing the availability of metals (Al,
Ba, Ca, Cr, Cu, Mg, Ni, Zn) in a more developed serpentine grassland and
forest vegetation, occurred only simultaneously with decrease of the Mg:Ca
ratio and rise in other factors of fertility (N, P, K). Progressive
development of ecosystem complexity therefore raised the availability of
metals, but also reduced harsh Mg:Ca ratio disproportion, boosted levels of
nutrients and raised soil field capacity. Principal components analysis
confirmed that the main differences among serpentine habitats lay primarily
in factors of fertility. The common habitat which hosts all three reference
species offers intermediate conditions in a plant habitat selection gradient.
Comparing serpentine with limestone showed ample difference in total content
and availability of most of the surveyed elements, but very few differences
in other chemical properties. The fragility of soil and ecosystem, and
biological value of serpentine habitats demand intensive research and
protection of these diversity and endemism hotspots of the Balkan Peninsula.
| Reference Key |
d.2014journaldynamics
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|---|---|
| Authors | ;Vicić Dražen D.;Stoiljković Milovan M.;Ninkov Jordana M.;Bojat Nenad Č.;Sabovljević Marko S.;Stevanović Branka M. |
| Journal | meditsinskaia radiologiia |
| Year | 2014 |
| DOI |
10.2298/JSC130917028V
|
| URL | |
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