Identification of keystone taxa shaping biocrust formation and biodeterioration of limestone monuments in the Xiaoling Tomb of the Ming Dynasty.

In the Mantel test, two genera, including an unclassified genus of the class Cyanobacteriia and Setophaeosphaerias , showed a significant correlation with NO 3 − ( P < 0.05); and an unclassified genus of the class Agaricomycetes demonstrated a highly significant correlation with NH 4 + ( P < 0.01), suggesting that these taxa are likely involved in nitrogen cycling in the biocrusts [ 41 – 43 ].

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