Changes in microbial biomass and community composition, and soil carbon and nitrogen pools after incorporation of rye into three California agricultural soils

Contamination of Soil by Copper Affects the Dynamics, Diversity, and Activity of Soil Bacterial Communities Involved in Wheat Decomposition and Carbon Storage

“…2A). Whatever the soil contamination, significant bacterial community dynamics were observed over the incubation period, suggesting a succession of active populations consecutive to wheat incorporation (8). However, particular active populations were stimulated in contaminated and pristine soils, confirming the hypothesis of Oorts and colleagues (10) on the possible adaptation of microbial communities to metals with maintenance of the potential decomposition ability (functional redundancy).…”

Legume and gramineous crop residues stimulate distinct soil bacterial populations during early decomposition stages

“…While the larger soil DNA pool size can partly be attributed to the DNA content of residues, higher soil RNA contents should be strictly correlated to real-time enhanced bacterial metabolic activities and cell division as RNAs are highly labile and reactive molecules that were undoubtedly degraded in original plant materials owing to their physical treatment before incorporation into soil. Thus, this fast increase in RNA contents strongly suggests an immediate stimulation of microbial activity following residues application, and is in agreement with studies focusing on the evolution of various bacterial features following soil enrichment with plant material, such as clover (Zelenev et al 2005), rye (Lundquist et al 1999), ryegrass (McMahon et al 2005 or pea (Ha et al 2008), and including a first sampling at early stages similar to our timescale (3Á5 d).…”

Bacterial and Fungal Contributions to Carbon Sequestration in Agroecosystems

“…Compared with conventional practices, organic farming practices have been shown to promote higher microbial biomass (Lundquist et al, 1999;Petersen et al, 1997) and to alter microbial community composition (Bossio et al, 1998;Petersen et al, 1997). In an incubation experiment where conventional and organic soils were amended with organic matter and exposed to similar incubation conditions, no differences in microbial biomass C or substrate-induced respiration were observed .…”