Agriculture Reference
In-Depth Information
TABLE 3: Cont.
Phylum
Class
Order
Family
Alfalfa
Scrubland
Rubrobacterales
0 (0.0%)
10 (50.0%)
Acidobacteria
Acidobacteria
Acidobacteriales
Acidobacteria-
ceae
0 (0.0%)
21 (56.8%)
Bacteriodetes
22 (18.2%)
10 (8.3%)
Chloroflexi
1 (2.1%)
25 (53.2%)
Spirochaetes
0 (0.0%)
12 (30.0%)
Verrucomi-
crobia
0 (0.0%)
13 (48.1%)
Gemmatimon-
adetes
0 (0.0%)
6 (66.7%)
Bacteria
(total)
295
(13.2%)
402
(17.9%)
All listed taxa have significantly different community structure between land uses except
for Nocardiaceae . Bold text: Taxa with significantly different community structure between
sites.
Compared to the soil from the scrublands, 13% of the OTUs (295 OTUs)
were more abundant in soil from alfalfa fi elds, while more OTUs (402
accounting for 18%) were less abundant (Table 3), suggesting few taxa
probably enriched in the alfalfa fi elds. A large proportion (more than 25%)
of the OTUs belonging to the phyla of Acidobacteria, Chlorofl exi, Spi-
rochaetes, Verrucomicrobia and Gemmatimonadetes were signifi cantly
less abundant in alfalfa soils (Table 3), suggesting that the transition of
scrubland soil into arable soils caused severe effects on the abundance of
OTUs affi liated to these phyla. A negative effect also was observed for
the class of Clostridia ( Firmicutes ), of which 29% of the OTUs detected
had signifi cantly lower signal intensities in the alfalfa soils (Table 3). The
infl uence of land use on the phyla Proteobacteria and Actinobacteria was
more complex as more than 40% of the OTUs belonging to three orders
of the Deltaproteobacteria ( Desulfobacterales, Desulfovibrionales and
Syntrophobacterales ) were less abundant while many taxa belonging to
 
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