pH regulation of carbon and nitrogen dynamics in two agricultural soils

The dissolved organic matter as a potential soil quality indicator in arable soils of Hungary

“…Various mechanisms have been suggested to explain this phenomenon, such as an increase in organic matter solubility (Erich and Trusty, 1997;Tombácz and Rice, 1999), increased microbial activity, an increase in the production of soluble molecules (Guggenberger et al, 1994) due to the decrease in biologically toxic Al at higher pH (Castro Filho and Logan, 1991), and the displacement of the previously adsorbed DOM by other mobilized anions (Vance and David, 1992). However, other mechanisms, such as the microbial consumption of DOM (Kemmitt et al, 2006) and DOM flocculation or adsorption by cation bridging due to higher Ca 2+ concentrations (Römkens and Dolfing, 1998), might also decrease the DOC concentration.…”

Soil pH effects on the interactions between dissolved zinc, non-nano- and nano-ZnO with soil bacterial communities

“…Exposure to zinc in all forms caused changes in the bacterial community when compared to the 23 control samples, illustrated by the increased distance between the treatment and control points. 24 Generally, there was a higher change in zinc exposed communities in low and medium pH soils (pH 4.5 25 and 5.9) versus the high pH soil (pH 7.2). This change is quantified in Figure 4, which shows the 26 between group (control and treatment dose) F-values from an Adonis analysis.…”

“…Including environmentally more realistic systems into the hazard 22 assessment of nanoparticles will consequently lead to a more complete environmental risk 23 assessment of engineered nanomaterials. 24 Previous work has focused on wastewater systems, identified as potential accumulators of engineered 25 nanoparticles, has highlighted effects on ecological functioning including methane production, 26 nitrogen and phosphorous removal, the production of extracellular polymeric substances (EPS) and themselves (e.g. nanoparticle composition, size, surface area and shape), but also their interaction 31 with the environment (pH and availability of natural organic matter) (Musee et al 2011).…”

“…As well as the characteristics of NPs (e.g., size, The aim of this study was to elucidate the role that soil pH plays on mediating the effect of zinc on soil 21 bacterial communities, and; whether the form in which zinc is dosed (nanoparticulate zinc oxide, non-22 nanoscale zinc oxide and ionic zinc dosed as the chloride salt) influences soil bacterial community 23 composition. 24 …”

Wheat Herbage Amendments Alter Emergence Dynamics, Seedling Growth of Lambsquarter and Soil Properties

“…Addition of wheat herbage of different growth stages has increased the nitrogen contents and pH of the soil during the 1 st week of incorporation (Table 2). Numerous studies have reported that the mineralization of carbon and nitrogen is pH-dependent (Marschner & Kalbitz, 2003;Kemmitt et al, 2006). Higher pH increases mineralization due to enhanced activity and survival of microorganisms and is also due to more solubility of dissolved organic compounds (Butterly et al, 2013).…”