The contributions of biocrusts to carbon and nitrogen cycles may be significant, as cryptogamic ground covers, including biocrusts, take up 590 Tg a −1 of carbon in steppes and deserts, while the biological nitrogen fixation adds up to 25.7 Tg a −1 of nitrogen [ 22 ].
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Photoautotrophic organisms control microbial abundance, diversity, and physiology in different types of biological soil crusts.
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