文摘
Soil microbes assimilated C from glucose and glutamate in both summer and winter. When microbes were N-limited (tussock tundra during the summer), glutamate was not assimilated into PLFAs. In contrast, when microbes appeared C-limited, glutamate and glucose were assimilated comparably into PLFAs. Fungi did not assimilate glutamate-C during the summer, suggesting N-limitation. Gram-positive bacteria appeared to be proteolytic specialists.