Abstract
This study was undertaken to investigate the long-term influence of lime application and tillage systems (no-till, ridge-till and chisel plow) on soil microbial biomass C (Cmic) and N (Nmic) and the activities of glycosidases (α- and β-glucosidases, α- and β-galactosidases and β-glucosaminidase) at their optimal pH values in soils at four agroecosystem sites [Southeast Research Center (SERC), Southwest Research Center (SWRC), Northwest Research Center (NWRC), and Northeast Research Center (NERC)] in Iowa, USA. Results showed that, in general, the Cmic and Nmic values were significantly (P <0.001) and positively correlated with soil pH. Each lime application and tillage system significantly (P <0.001) affected activities of the glycosidases. With the exception of α-glucosidase activity, there was no lime×tillage interaction effect. Simple correlation coefficients between the enzyme activities and soil pH values ranged from 0.51 (P <0.05) for the activity of α-glucosidase at the NWRC site (surface of the no-till) to 0.98 (P <0.001) at the SWRC site. To assess the sensitivity of the enzymes to changes in soil pH, the linear regression lines were expressed in Δactivity/ΔpH values. In general, their order of sensitivity to changes in soil pH was consistent across the study sites as follow: β-glucosidase>β-glucosaminidase>β-galactosidase>α-galactosidase>α-glucosidase. Lime application did not significantly affect the specific activities (g p -nitrophenol released kg–1 soil organic C h–1) of the enzymes. Among the glycosidases studied, β-glucosidase and β-glucosaminidase were the most sensitive to soil management practices. Therefore, the activities of these enzymes may provide reliable long-term monitoring tools as early indicators of changes in soil properties induced by liming and tillage systems.
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This work was supported in part by the Biotechnology By-products Consortium of Iowa and by the Iowa Limestone Producers Association.
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Ekenler, M., Tabatabai, M.A. Effects of liming and tillage systems on microbial biomass and glycosidases in soils. Biol Fertil Soils 39, 51–61 (2003). https://doi.org/10.1007/s00374-003-0664-8
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DOI: https://doi.org/10.1007/s00374-003-0664-8