Characteristics of Microbial Carbon Utilization in Peat Pore Water in the Dajiuhu Peatland,Shennongjia
In order to investigate the characteristics of microbial carbon metabolic activity in peatlands with water table fluctuation,microbial community-level physiological profiling of peat pore water was determined with the different water table levels using Biolog-Eco microplate technology in the Dajiuhu Peatland,Shennongjia Forestry District. The results show that the rate and diversity of microbial carbon utilization at the mediate water table were the highest,followed by the low water table,with the lowest at the high water table. Esters (pyruvic acid methyl ester,Tween 40,Tween 80 and D-Galactonic acid γ-lactone),amino acids (L-arginine,L-asparagine,L-phenylalanine,L-serine and glycyl-L-glutamic acid) and amines (phenylethylamine,putrescine and N-acetyl-D-glucosamine) were the main contributors to the variations in microbial carbon utilization of peat pore water. Redundancy analysis and fitting regression model indicate that electrical conductivity (F=3.2,P=0.018) and oxidation-reduction potential (F=2.6,P=0.044) driven by water table level affected microbial carbon utilization of peat pore water. This study reveals the effect of water table fluctuation on microbial carbon utilization in peat pore water,which enriches our understanding of carbon cycle in peatlands in the context of global climate change.
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