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- W2144856980 abstract "Abstract The CO 2 efflux from loamy Haplic Luvisol and heavy metal (HM) uptake by Zea mays L. were studied under increased HM contamination: Cd, Cu, and Ni up to 20, 1000, and 2500 mg kg −1 soil, respectively. Split-root system with contrasting HM concentrations in both soil halves was used to investigate root-mediated HM translocation in uncontaminated soil zones. To separate root-derived and soil organic matter (SOM)-derived CO 2 efflux from soil, 14 CO 2 pulse labeling of 15-, 25-, and 35-days-old plants was applied. The CO 2 evolution from the bare soil was 10.6 μg C–CO 2 d −1 g −1 (32 kg C–CO 2 d −1 ha −1 ) and was not affected by HM (except 2500 mg Ni kg −1 ). The average CO 2 efflux from the soil with maize was about two times higher and amounted for about 22.0 μg C–CO 2 d −1 g −1 . Portion of assimilates respired in the rhizosphere decreased with plant development from 6.0 to 7.0% of assimilated C for 25-days-old Zea mays to 0.4–2.0% for 45-days-old maize. The effect of the HM on root-derived 14 CO 2 efflux increased with rising HM content in the following order: Cd 4 NO 3 extract) increased with contamination and amounted to 9–16%, 2–6% and 1.5–3.5% for Cd, Cu, and Ni, respectively. Corresponding values for the easily available HM (1 M NH 4 OAc extract) were 22–52%, 1–20% and 5–8.5%. Heavy metal availability for plants decreased in the following order: Cd > Cu ≥ Ni. No increase of HM availability in the soil was found after maize cultivation." @default.
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- W2144856980 date "2008-09-01" @default.
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- W2144856980 title "Effect of heavy metals contamination on root-derived and organic matter-derived CO2 efflux from soil planted with Zea mays" @default.
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- W2144856980 doi "https://doi.org/10.1016/j.ejsobi.2008.09.006" @default.
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