Table 1.

Fosmid libraries constructed and screened in this study.

Library	Dec10_01XX	Dec10_08XX	Feb11_01XX	Feb11_08XX	Feb11_16XN	Mar12_01XX	Mar12_08XX
Sampling time	December 2010	December 2010	February 2011	February 2011	February 2011	March 2012	March 2012
Treatment	Control	Control	Control	Control	Nitrogen	Control	Control
Number of screened clones	21,755	18,540	10,830	15,105	26,818	25,080	25,080

Control treatment included ambient precipitation and ambient nitrogen deposition, while the nitrogen treatment had nitrogen enrichment and ambient precipitation.