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Effect of plant materials on microbial transformation of amino sugars in three soil microcosms
Authors:Chao Liang  Xudong Zhang  IV" target="_blank">Kennedy F RubertIV  Teri C Balser
Institution:(1) Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, 110016 Shenyang, People’s Republic of China;(2) Department of Soil Science, University of Wisconsin, 263 Soils Bldg, 1525 Observatory Drive, Madison, WI 53706, USA;(3) Molecular and Environmental Toxicology Center, University of Wisconsin, Madison, 53706, USA
Abstract:Amino sugars, being predominantly of microbial origin, can help elucidate the role of microbes in carbon and nitrogen cycling in soils. However, little is known about the microbial degradation and synthesis of soil amino sugars as affected by plant-derived organic materials. We conducted a 30-week microcosm study using three soils amended with soybean leaf or maize stalk to investigate changes in the amounts and patterns of amino sugars over time. The total soil amino sugar content initially increased during the incubation, but later decreased. Amino sugar content of soil amended with maize stalk peaked at an earlier time than it did for soybean leaf, suggesting nutrient quantity and substrate composition influence microbial transformation. Temporal dynamics of the proportion of total soil amino sugar to organic matter after plant material addition conformed to parabolic models (r > 0.8; p < 0.01), which tended to converge over time. The models predicted that the proportions would ultimately approach the initial values as determined before amendment. These findings suggest that soil organic matter has the ability to maintain a baseline steady-state level of amino sugars, and support the interpretation of soil amino sugar reservoir as two components: the Stable Pool (SP) and the Transition Pool (TP).
Keywords:Amino sugar  Microbial residue  Plant material  Microbial transformation  Pool
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