Soil pH controls nitrification and carbon substrate utilization more than urea or charcoal in some highly acidic soils

摘要: Understanding the mechanism and key controlling factors of nitrification in highly acidic soils is important from both ecological environmental perspectives. Many acid are also characterized by vegetation that produces polyphenolic terpene compounds inhibit microbial activity. We investigated potentially ameliorative effects lime, charcoal, urea additions on soil carbon substrate utilization (using MicroResp method). Four were studied widely different environments but with similar pH inputs phytochemicals to determine relative these factors. The addition charcoal had no significant effect net nitrification, significantly increased basal respiration altered C two Scottish soils. Urea greatly Chinese soils, there was Lime application all except for mixed forest soil. Multivariate analysis source data revealed lime more than or Our results suggest acid-tolerant nitrifiers do exist have potential high activity, (lime addition) N-substrate (urea) most often nitrification. However, single factor controlled every soil, suggesting an interaction between abiotic nitrifier community composition as a result land use type interactions.