46 research outputs found
Rock Fragments Control Size and Saturation of Organic Carbon Pools in Agricultural Topsoil
Evaluation of contaminant retention in the soil of sustainable drainage systems: methodological reflections on the determination of sorption isotherms
Prediction of soil carbon levels in calcareous soils of Iran by mid-infrared reflectance spectroscopy
Black carbon estimation in French calcareous soils using chemo-thermal oxidation method
We studied the black carbon (BC) content of ca. 405 samples from French topsoil and artificial soil and carbonate mixtures. Our protocol involved three main steps: (i) decarbonation by HCl, (ii) elimination of non-pyrogenic organic carbon in a furnace at 375 degrees C, and (iii) quantification of residual carbon by CHN analysis. BC content increased for calcareous soils according to their carbonates content. Subsequent analyses confirmed the existence of a methodological artefact for BC determination only in calcareous soils. Decarbonation changes the thermal properties of organic matter, creating more recalcitrant carbon than in the initial sample. Higher CaCO3 and organic carbon content results in a more pronounced artefact. The reversal of the first two steps of the chemo-thermal oxidation method (i. e. thermal oxidation before soil decarbonation) eliminates this artefact. Overall, our results suggest that BC content may have been overestimated in a large number of studies on calcareous soils
Effects of fertilisation on radionuclide uptake by maize from an acidic soil in northwestern Croatia
Dissipation of mecoprop-P, isoproturon, bentazon and S-metolachlor in heavy metal contaminated acidic and calcareous soil before and after EDTA-based remediation
Density separation of soil organic matter across three land uses in calcareous soils of Iran
Effects of azoxystrobin, chlorothalonil and ethoprophos on the reproduction of three terrestrial invertebrates using a Mediterranean soil
The potential terrestrial toxicity of three pesticides, azoxystrobin, chlorothalonil, and ethoprophos was
evaluated using reproduction ecotoxicological tests with different non-target species: the collembolan
Folsomia candida, the earthworm Eisenia andrei, and the enchytraeid Enchytraeus crypticus. All reproduction
tests were performed with natural soil from a Mediterranean agricultural area (with no pesticide
residues) in order to improve the relevance of laboratory data to field conditions. Controls were performed
with natural and standard artificial soil (OECD 10% OM). The fungicide azoxystrobin showed the
highest toxicity to earthworms (EC50 = 42.0 mg a.i. kg−1 dw soil). Collembolans were the most sensitive
taxa in terms of sublethal effects of chlorothalonil with an EC50 of 31.1 mg a.i. kg−1 dw soil followed by
the earthworms with an EC50 of 40.9 mg a.i. kg−1 dw soil. The insecticide ethoprophos was the most toxic
to collembolans affecting their reproduction with an EC50 of 0.027 mg a.i. kg−1 dw soil. Enchytraeids were
generally the least sensitive of the three species tested for long-term effects. Earthworms were not always
the most sensitive species, emphasizing the need to increase the number of mandatory assays with key
non-target organisms in the environmental risk assessment of pesticidesinfo:eu-repo/semantics/publishedVersio