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Activities Of Nitrogen-Mineralization Enzymes Associated With Soil Aggregate Size Fractions Of Three Tillage Systems

S. Muruganandam, D. Israel, W. Robarge
Published 2009 · Chemistry

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Nitrogen mineralization occurring near the soil surface of agroecosystems determines the quantity of plant-available N, and soil enzymes produced by microorganisms play signifi cant roles in the N mineralization process. Tillage systems may infl uence soil microbial communities and N mineralization enzymes through alterations in total soil C and N. Soil aggregates of different sizes provide diverse microhabitats for microorganisms and therefore infl uence soil enzyme activities. Our objective was to test the hypothesis that activities of N mineralization enzymes increase with aggregate size and in no-till compared with tilled systems. Potential activities of N-acetyl glucosaminidase (NAG), arylamidase, l-glutaminase, and l-asparaginase were measured in fi ve aggregate size fractions (<0.25, 0.25–0.5, 0.5–1, 1–2, and 2–4 mm) obtained from soils of three long-term (22-yr) tillage systems (no-till, chisel plow, and moldboard plow). All enzyme activities were signifi cantly (P < 0.05) greater in notill than in tilled systems and positively correlated (P < 0.005) with potential N mineralization. Potential activities of NAG, l-glutaminase, and arylamidase were signifi cantly greater (P < 0.05) in the intermediate (0.5–1-mm) aggregate size than in other size fractions. All enzyme activities were positively correlated with total soil C (P < 0.0001), N (P < 0.05), and microbial biomass C (P < 0.05). Aggregate size had signifi cant effects on NAG, arylamidase, and l-glutaminase activities but the magnitudes were small. Fungal biomarkers (18:2ω6c and 16:1ω5c) determined by the phospholipid fatty acid (PLFA) method were signifi cantly greater in the no-till than in tilled systems and positively correlated with all enzyme activities. This suggests that no-till management enhances activities of N mineralization enzymes by enhancing the proportion of fungal organisms in the soil microbial community.
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