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论文题目 Organic carbon availability limiting microbial denitrification in the deep vadose zone
作  者 Chen, SM (陈帅民); Wang, FH (王凤花); Zhang, YM (张玉铭); Qin, SP (秦树平); Wei, SC (魏守才); Wang, SQ (王仕琴); Hu, CS (胡春胜); Liu, BB (刘彬彬);
发表年度 2018
刊物名称 ENVIRONMENTAL MICROBIOLOGY
卷、期、页码 20; 3; 980-992
影响因子
论文摘要
Microbes in the deep vadose zone play an essential role in the mitigation of nitrate leaching; however, limited information is available on the mechanisms of microbial denitrification due to sampling difficulties. We experimentally studied the factors that affect denitrification in soils collected down to 10.5 meters deep along the soil profile. After an anoxic pre‐incubation, denitrification rates moderately increased and the N2O/(N2O?+?N2) ratios declined while the microbial abundance and diversity did not change significantly in most of the layers. Denitrification rate was significantly enhanced and the abundance of the denitrification genes was simultaneously elevated by the increased availability of organic carbon in all studied layers, to a greater extent in the subsurface layers than in the surface layers, suggesting the severe scarcity of carbon in the deep vadose zone. The genera Pseudomonas and Bacillus, which are made up of a number of species that have been previously identified as denitrifiers in soil, were the major taxa that respond to carbon addition. Overall, our results suggested that the limited denitrification in the deep vadose zone is not because of the lack of denitrifiers, but due to the low abundance of denitrifiers which is caused by low carbon availability.
 
全文链接 http://doi.org/10.1111/1462-2920.14027
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