Table 3 Core functional genes involved in carbon degradation or nitrogen cycling correlated significantly (P < 0.05) with CO₂ efflux or soil nitrification potential^a.

Genbank. ID	Gene^b	Sub-category	Organism
92441508	amyA	Starch degradataion	Mycobacterium sp. KMS
49613597	amyA	Starch degradataion	Erwinia carotovora subsp. atroseptica SCRI1043
154304204	ara	Hemicellulose degradataion	Botryotinia fuckeliana B05.10
145596104	xylA	Hemicellulose degradataion	Salinispora tropica CNB-440
114050057	vanA	Aromatics degradataion	Streptomyces ambofaciens
218758227	aceB	Aromatics degradataion	Desulfovibrio vulgaris str. ‘Miyazaki F'
113129062	*chi*	Chitin degradataion	Hypocrea virens
119189427	chi	Chitin degradataion	Coccidioides immitis RS
83815976	acetylglucosaminidase	Chitin degradataion	Salinibacter ruber DSM 13855
598355	lip	Lignin degradataion	Phanerochaete chrysosporium
71361353	amoA	Nitrification	uncultured bacterium
125714545	ureC	Ammonification	Clostridium thermocellum ATCC 27405
112462455	nirK	Denitrification	uncultured bacterium
12744271	nosZ	Denitrification	uncultured temperate forest soil bacterium CZ1441
124488109	*napA*	Dissimilatory N reduction	uncultured bacterium
95133480	*nrfA*	Dissimilatory N reduction	Desulfuromonas acetoxidans DSM 684
154151622	nifH	Nitrogen fixation	Candidatus Methanoregula boonei 6A8
3157614	*nifH*	Nitrogen fixation	unidentified nitrogen-fixing bacteria
148342406	*nifH*	Nitrogen fixation	uncultured bacterium
2897667	*nifH*	Nitrogen fixation	Paenibacillus macerans

^aFunctional genes correlated significantly (P < 0.01) with aboveground biomass are presented in bold.
^bThe carbon degradation genes include amyA (alpha amylase), ara (arabinofuranosidase), xylA (xylose isomerase), vanA (vanillate monooxygenase), aceB (malate synthase), chi (endochitinase), lip (ligninase) and acetylglucosaminidase; and the N cyling genes includeureC (urease), nirK (nitrite reductase), nosZ (nitrous oxide reductase), napA (nitrate reductase), nrfA (c-type cytochrome nitrite reductase) and nifH (nitrogenase reductase).

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