Incorporation of ¹³C-labeled rice-straw-derived carbon into microbial communities in submerged rice field soil and percolating water

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• 作者：Jun Murase ; Yuri Matsui ; Masahiko Katoh ; Atsuko Sugimoto and Makoto Kimura
• 关键词：Paddy soil ; Rice straw ; PLFA-SIP ; Soil organic matter ; Percolating water
• 刊名：Soil Biology & Biochemistry
• 出版年：2006
• 出版时间：December 2006
• 年：2006
• 卷：38
• 期：12
• 页码：3483-3491
• 全文大小：203 K

文摘

Rice straw is a major organic material applied to rice fields. The microorganisms growing on rice-straw-derived carbon have not been well studied. Here, we applied ¹³C-labeled rice straw to submerged rice soil microcosms and analyzed phospholipid fatty acids (PLFAs) in the soil and percolating water to trace the assimilation of rice-straw-derived carbon into microorganisms. PLFAs in the soil and water were markedly enriched with ¹³C during the first 3 days of incubation, which indicated immediate incorporation of rice-straw-derived carbon into microbial biomass. The enrichment of PLFAs in the percolating water with ¹³C suggested that microorganisms other than the population colonizing rice straw also assimilated rice-straw-derived carbon or that some bacterial groups were selectively released from the straw. The microbial populations could be categorized into two communities based on the carbon isotope data of the PLFAs: those derived from rice straw and those derived from soil organic matter (SOM). The composition of the PLFAs from the two communities differed, which indicated the assimilation of rice-straw-derived carbon by a subset of microbial populations. The composition of rice-straw-derived PLFAs in the percolating water was also distinct from that in the soil.