Shifting patterns of microbial N-metabolism across seasons in upland Alaskan tundra soils

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• 作者：Shawna McMahon ; Joshua P. Schimel ; ^{Schimel@lifesci.ucsb.edu}
• 关键词：Tundra ; PLFAs ; N-limitation ; Frozen soil
• 刊名：Soil Biology and Biochemistry
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：105
• 期：Complete
• 页码：96-107
• 全文大小：1973 K
• 卷排序：105

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.