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Several studies have identified optima in soil water content for aerobic microbial activity, and this has been ascribed to a balance between gas and solute diffusivity as limiting processes. We investigated the role of soil structure, as created by different tillage practices (moldboard ploughing, MP, or shallow tillage, ST), in regulating net nitrification, applied here as an index of aerobic microbial...
The concept of structural and functional hierarchy prevails in studies on the turnover of organic matter (OM) in soil. We examined the degree of structural hierarchy in arable soils sampled at six locations along a naturally occurring texture gradient (11 to 45% clay, 12.9 to 15.8 mg C g −1 soil). One set of samples was incubated with 14 C labeled ryegrass for 8 months while another...
Whole soil samples and four aggregate size classes (2-8 mm, 1-2 mm, 0.5-1 mm and 0.25-0.5 mm) from organically or conventionally farmed sandy loam soils were compared with respect to texture, C content and C mineralization potential, microbial biomass C and phospholipid fatty acid (PLFA) composition. The PLFA concentration of organically farmed soils (44-56 nmol g -1 dry wt.) was larger...
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