Nitrogenase activity of biological soil crusts and its response to hydrothermic factors in the Shapotou region of northern China
ZHANG Peng, LI Xin-Rong, JIA Rong-Liang, HU Yi-Gang, HUANG Lei
Chin J Plant Ecol . 2011, (9): 906 -913 .  DOI: 10.3724/SP.J.1258.2011.00906

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