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Structure of bacterial communities

The input of residual organic products (ROPs) does not significantly alter the structure of bacterial communities, even during the first month after spreading. Temporal effects have a greater influence on the composition of bacterial communities.

TTGE analysis

The kinetic analysis (over time) of bacterial populations does not show any significant difference between samples S1, S2 and S3. This means that the spreading carried out in September 2004, just after S1, did not significantly alter the bacterial populations two months and seven months later. However, it is known that organic matter mineralisation quickly becomes active after the spreading of ROPs. Differences between the treatments might therefore have been expected in sample S2.
In sample S2, two years after the spreading of 2004 and just before that of 2006, differences can be observed, with the GWS treatment being distinguished from the MSW treatment (two repetitions) and nitrogen-free control (T0, two repetitions). The similarity percentage differences are nevertheless low; caution is therefore advised when making interpretations (results shown in Figure 1).
These differences between GWS, MSW and the control can also be seen in S5.
In S6, two years after the spreading of 2004 and just before that of 2006, there is no difference between the treatments. The differences observed for the GWS treatment in S4 and S5 have disappeared.
Lastly, in S7, one month after the spreading of 2006, GWS is once again distinguished from MSW. 
In the case of the control, as with the GWS and MSW treatments, different classes are observed in accordance with the samples. All of the microbial communities change over time without returning to the initial state, even in the case of the control. The "natural" change in bacterial communities prevails over the possible effects of the composts.


Figure 1. Breakdown of residues in sample S4 from the different treatments by similarity class and composition of the similarity classes. Samples from the same class have the same genetic structure.

T-RFLP analysis

The results confirm those of the TTGE analysis, i.e. the absence of an effect from the input of ROPs and the effect of "natural" temporal variations.
Figure 2 shows the population groups obtained from the samples: the groups correspond to the sample dates and there is no difference between the treatments.

Figure 2. Analysis of the main components of the structure of bacterial communities in the soil in accordance with the samples and the treatment.