Rhizosphere effects on soil microbial biomass size and turnover in a soil of high and low fertility
文献类型： 会议论文
第一作者： A. DE NEERGAARD
作者： A. DE NEERGAARD 1 ; J. MAGID;
作者机构： 1.Agroecology, Department of Agricultural Sciences, Royal Veterinary and Agricultural University (KVL), DK-2630 Taastrup
关键词： soil microbial;biomass;soil
会议名称： Sustainable management of soil organic matter
主办单位：
页码： 386-392
摘要： Various methods for studying the soil microbial biomass (SMB) in the rhizosphere and its influence on soil organic matter have been developed. Different measures, such as direct bacteria counting (e.g. Rovira et al., 1974; Badalucco et al., 1996), ATP content (Youssef et al., 1989), enzyme activity (Badalucco et al., 1996) or fumigation incubation (Helal and Sauerbeck, 1986) have been used for determining SMB in the rhizosphere. Likewise, several studies have investigated the decomposition of ~(14)C-labelled soil organic matter (SOM) or plant material in the presence of roots and have yielded conflicting results (e.g. Jenkinson, 1977; Sparling et al., 1982; Martin, 1987; Sallih and Bottner, 1988; Cheng and Coleman, 1990). The use of a model rhizosphere system (Gahoonia and Nielsen, 1991), combined with ~(14)C labelling of an SOM pool and the SMB, enabled direct measurements of the SMB in distinct soil layers in close proximity to roots and an investigation of its influence on the turnover of recently formed microbial residues.
分类号： S153.62
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