Effect of plant materials on microbial transformation of amino sugars in three soil microcosms |
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Authors: | Chao Liang Xudong Zhang IV" target="_blank">Kennedy F RubertIV Teri C Balser |
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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 |
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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). |
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Keywords: | Amino sugar Microbial residue Plant material Microbial transformation Pool |
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