Bacterial growth and growth-limiting nutrients following chronic nitrogen additions to a hardwood forest soil |
| |
| Institution: | 1. P.G. Department of Environmental Science, PVP College Pravanagar, University of Pune, Pune, India;2. K.T.H.M. College Nashik, University of Pune, Pune, India;3. Section of Microbial Ecology, Department of Biology, Ecology Building, Lund University, SE-223 62 Lund, Sweden;4. Department of Natural Resources & the Environment, University of New Hampshire, Durham, NH 03824, USA;1. Department of Biology, West Virginia University, Life Sciences Building, 53 Campus Drive, Morgantown, WV, 26506, USA;2. Northern Research Station, USDA Forest Service, 180 Canfield Street, Morgantown, WV, 26506, USA;1. Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, České Budějovice, Branišovská 31, 37011, Czech Republic;2. Biology Centre CAS, Institute of Hydrobiology, Na Sádkách 702/2, České Budějovice 37005, Czech Republic;1. Department of Natural Resources & the Environment, University of New Hampshire, Durham, NH 03824, USA;2. Hubbard Center for Genome Studies, University of New Hampshire, Durham, NH 03824, USA;3. Departments of Botany and Bacteriology, University of Wisconsin, Madison, WI 53706, USA;1. Department of Plant Biology and Soil Science, Section of Soil Science, University of Vigo, 32004 Ourense, Spain;2. Department of Soil Science and Agricultural Chemistry, Engineering Polytechnic School, Campus Univ. Lugo, Universidade de Santiago de Compostela, Galicia, Spain;3. Department of Soil Biochemistry, Galician Intitute of Agrobiology Research (IIAG-CSIC), Avda. Vigo s/n, 15780 Santiago de Compostela, Spain;4. Department of Biology, Microbial Ecology – MEMEG, Ecology Building, Lund University, SE-223 62 Lund, Sweden |
| |
| Abstract: | Increasing nitrogen (N) deposition due to anthropogenic activities has become a significant global change threat to N-poor terrestrial ecosystems. We compared bacterial growth and nutrients limiting bacterial growth in one of the longest running experiments on increasing N-deposition to a temperate forest, the Chronic Nitrogen Amendment Study at Harvard Forest, USA. Soil samples were collected in fall 2009 from the organic and mineral horizons of plots treated annually since 1988 with 0 (unfertilized), 50 (low N) or 150 (high N) kg N ha−1 as NH4NO3. In the organic horizon, bacterial growth (leucine incorporation) decreased by 5 times in the high N plots compared to the unfertilized treatment, while no decrease was observed in the mineral horizon. Bacterial growth in all soils was primarily limited by lack of carbon (C), although adding only C (as glucose) resulted in only a minor increase in bacterial growth in the unfertilized soil compared to adding C in combination with N. The bacterial growth induced by adding only C increased with higher level of N fertilization, up to 7–8 times the level without any C addition in the high N treatment, suggesting increased availability of N for the bacteria with increasing N addition. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
