Abstract
			
			This study was conducted to assess bacterial species richness,
diversity and community distribution according to different
fertilization regimes for 16 years in citrus orchard soil of volcanic
ash. Soil samples were collected and analyzed from
Compost (cattle manure, 2,000 kg/10a), 1/2 NPK+compost
(14-20-14+2,000 kg/10a), NPK+compost (28-40-28+2,000
kg/10a), NPK (28-40-28 kg/10a), 3 NPK (84-120-84 kg/10a),
and Control (no fertilization) plot which have been managed
in the same manners with compost and different amount of
chemical fertilization. The range of pyrosequencing reads
and OTUs were 4,687–7,330 and 1,790–3,695, respectively.
Species richness estimates such as Ace, Chao1, and Shannon
index were higher in 1/2 NPK+compost than other treatments,
which were 15,202, 9,112, 7.7, respectively. Dominant
bacterial groups at level of phylum were Proteobacteria, Acidobacteria,
and Actinobacteria. Those were occupied at 70.9%
in 1/2 NPK+compost. Dominant bacterial groups at level
of genus were Pseudolabrys, Bradyrhizobium, and Acidobacteria.
Those were distributed at 14.4% of a total of bacteria
in Compost. Soil pH displayed significantly closely related
to bacterial species richness estimates such as Ace, Chao1
(p<0.05) and Shannon index (p<0.01). However, it showed
the negative correlation with exchangeable aluminum contents
(p<0.05). In conclusion, diversity of bacterial community
in citrus orchard soil was affected by fertilization management,
soil pH changes and characteristics of volcanic ash.			
						
						
					 
		
		
		 
		
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