Table 3.

Diversity of soil ammonia-oxidizing archaea (AOA) as affected by fertilization and irrigation in 2018.

Treatments	OTUs	Coverage (%)	Richness		Diversity
			ACE	Chao 1	H′	D
T0	16,573 ± 2812a	99.998 ± 0.433a	23 ± 3a	23 ± 3a	2.05 ± 0.18a	0.20 ± 0.05a
T1	17,049 ± 4413a	99.999 ± 0.266a	18 ± 5a	18 ± 4a	1.89 ± 0.40a	0.22 ± 0.10a
T2	17,956 ± 3252a	99.990 ± 0.456a	26 ± 3a	25 ± 2a	1.69 ± 0.17a	0.29 ± 0.07a

T₀ = Traditional irrigation; T₁ = Traditional irrigation and fertilization practice; T₂ = Water-saving irrigation and optimizing fertilization. Operational taxonomic units (OTUs); Abundance-based coverage estimators (ACE); . Values (means ± SD) with different lower-case letters in a column are significantly different at P < 0.05 according to the Duncan test.