Carbon and nitrogen cycling in a lead polluted grassland evaluated using stable isotopes (δ13C and δ15N) and microbial, plant and soil parameters

Rijk, Ingrid. J. C.,1985-Örebro universitet,Institutionen för naturvetenskap och teknik (författare)

Aims: Carbon (C) and nitrogen (N) cycling are key ecosystem functions potentially altered by heavy metal pollution. We used an ecosystem approach to study the long-term effect of lead (Pb) on C and N cycles in a natural grassland in a former shooting range.Methods: Microbial activity was evaluated by substrate-induced respiration (SIR) in situ, adding isotopically labelled C4-sugar to the soil. C and N contents and natural abundance of isotopes were measured in grass leaves, soil and microbial biomass together with root biomass.Results: A reduced microbial activity and microbial biomass per area, together with a higher soil C stock and C:N ratio suggested a lower microbial decomposition in high Pb compared to low Pb areas. A more closed N cycle in the high Pb area was indicated by 2–3‰ lower δ15N in leaves and soil compared to low Pb areas. Higher δ13C in leaves and higher root biomass but similar leaf nutrient contents indicated plant responses and adaptions to the high Pb. Conclusions: The applied ecosystem approach revealed that Pb slowed down the C and N cycles, possibly by indirect effects rather than by direct toxicity. The ecosystem seems to have adapted to altered conditions.

LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Markvetenskap hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Soil Science hsv//eng
Ecological risk assessment
Field studies
Heavy metal contamination
Soil microbial respiration
Soil nutrient cycling
Stable isotopes
carbon cycle
carbon isotope
decomposition
ecosystem approach
ecosystem function
grassland
lead
microbial activity
nitrogen cycle
nitrogen isotope
soil pollution
stable isotope

Ekblad, Alf,1957-Örebro universitet,Institutionen för naturvetenskap och teknik(Swepub:oru)afed (författare)
Örebro universitetInstitutionen för naturvetenskap och teknik (creator_code:org_t)

Ingår i:Plant and Soil: Kluwer Academic Publishers449:1-2, s. 249-2660032-079X1573-5036

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