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Assessing the effect of air-drying and storage on microbial biomass and community structure in paddy soils
Yueyan Liu, Huaiying Yao and Changyong Huang
Plant and Soil
Vol. 317, No. 1/2 (April 2009), pp. 213-221
Published by: Springer
Stable URL: http://www.jstor.org/stable/24129770
Page Count: 9
You can always find the topics here!Topics: Acid soils, Soil microorganisms, Fatty acids, Paddy soils, Soil biochemistry, Soil water, Rice soils, Soil composition, Soil quality, Soil treatment
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To understand the effect of air-drying pretreatment, refrigeration, and freezing storages on microbial biomass and community structure in paddy soils, we measured total phospholipid fatty acid (PLFA) and PLFA profile after five treatments, including flooded (F), flooded-freezing (FF), flooded-air-drying (FAD), flooded-air-drying-freezing (FADF), and flooded-air-drying-refrigeration (FADR). FF and FADF treatments were followed by freeze-drying before analyzing the total PLFA and PLFA profile. The results showed that FF and FADF treatments increased the content of polyunsaturated fatty acids, but decreased that of branched chain saturated fatty acids. FAD treatment increased the concentrations of bacterial, aerobic bacterial, stress, Type I methanotrophs, and Gram-negative bacterial biomarkers, while it decreased the concentration of hydroxy fatty acid group and the ratios of cyclopropyl saturated fatty acids to their monoenoic precursors. FADR significantly decreased the concentration of total PLFA and all PLFA groups except for the monounsaturated fatty acid group. Statistical analysis with correspondence analysis showed that air-drying and storage changed the microbial community structure, but the effect of air-drying on soil microbial community structure was more pronounced than that of freezing. These results indicated that deep freezing followed by freeze-drying may be the most recommendable procedure before soil biochemical analysis in flooded paddy soils.
Plant and Soil © 2009 Springer