caa a22 4500 605516847 CHVBK 20210128100716.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s10533-014-0043-6 doi (NATIONALLICENCE)springer-10.1007/s10533-014-0043-6 Effects of calcium silicate treatment on the composition of forest floor organic matter in a northern hardwood forest stand [Elektronische Daten] [Ankit Balaria, Chris Johnson, Peter Groffman, Melany Fisk] Calcium amendment can help improve forest sustainability in stands that have been impacted by chronic acid deposition. An important component of this improvement is the stimulation of the microbial activity that supports ecosystem nutrient cycling processes. To test the hypothesis that Ca treatment alters the structure and solubility of organic matter substrates, an important driver of microbial activity, we investigated the effect of wollastonite (CaSiO3) treatment on soil organic matter (SOM) and hot-water-extractable organic matter (HWEOM). We found a decrease in the HWEOM content of forest floor soils within 2years of treatment with a high dosage of wollastonite (4,250kgCa/ha), but not at a low dosage (850kgCa/ha). High-dosage treatment did not reduce the biodegradability of HWEOM. Hence, a high dose of CaSiO3 appears to reduce the solubility of organic matter in the forest floor but not the bioavailability of the extracted SOM. Nuclear magnetic resonance spectroscopy revealed no significant changes in the O-alkyl C content of SOM in response to wollastonite addition, but a reduction in the O-alkyl C content of HWEOM suggests that the extractability of carbohydrate structures was reduced by added CaSiO3. Phosphorous treatment, when performed in combination with Ca, also decreased the O-alkyl C content of HWEOM, but had no effect when performed without Ca. The reduced solubility of SOM after Ca treatment may have been the result of bridging between Ca2+ and negatively charged sites on SOM, as suggested in other studies. Also, high concentrations of Si in soil solution, due to dissolution of the wollastonite, likely resulted in oversaturated conditions with respect to SiO2 or kaolinite, perhaps leading to co-precipitation of soluble organic matter. Overall, our results suggest that added Ca and/or Si may react with SOM to reduce the accessibility of labile C forms to soil microbes. Springer International Publishing Switzerland, 2014 Calcium nationallicence Forest soil nationallicence Hot-water extractable organic matter nationallicence Nuclear magnetic resonance spectroscopy nationallicence Phosphorus nationallicence Soil carbon nationallicence Soil organic matter nationallicence Balaria Ankit Department of Civil and Environmental Engineering, Syracuse University, 151 Link Hall, 13244, Syracuse, NY, USA aut Johnson Chris Department of Civil and Environmental Engineering, Syracuse University, 151 Link Hall, 13244, Syracuse, NY, USA aut Groffman Peter Cary Institute of Ecosystem Studies, 2801 Sharon Turnpike, P. O. Box AB, 12545, Millbrook, NY, USA aut Fisk Melany Department of Biology, Miami University, 45056, Oxford, OH, USA aut Biogeochemistry Springer International Publishing 122/2-3(2015-02-01), 313-326 0168-2563 122:2-3<313 2015 122 10533 https://doi.org/10.1007/s10533-014-0043-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-014-0043-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Balaria Ankit Department of Civil and Environmental Engineering, Syracuse University, 151 Link Hall, 13244, Syracuse, NY, USA aut NATIONALLICENCE 700 1- Johnson Chris Department of Civil and Environmental Engineering, Syracuse University, 151 Link Hall, 13244, Syracuse, NY, USA aut NATIONALLICENCE 700 1- Groffman Peter Cary Institute of Ecosystem Studies, 2801 Sharon Turnpike, P. O. Box AB, 12545, Millbrook, NY, USA aut NATIONALLICENCE 700 1- Fisk Melany Department of Biology, Miami University, 45056, Oxford, OH, USA aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 122/2-3(2015-02-01), 313-326 0168-2563 122:2-3<313 2015 122 10533