Functional significance of microbial diversity in arid soils: biological soil crusts and nitrogen fixation as a model system.

Similarly, in the two cases when there was a significant or marginally significant origin-by-sample type effect, transplanting the communities to a new environment tended to decrease alpha-diversity of nitrogen cycling genes for ammonia assimilation, denitrification, and dissimilatory nitrite to ammonia (Fig. 6B , Table 3 ).

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