| Title: | "Effects of increasing organic nitrogen inputs on CO(2), CH(4), and N(2)O fluxes in a temperate grassland" |
| Author(s): | Chen J; Zhang Y; Yang Y; Tao T; Sun X; Guo P; |
| Address: | "College of Agro-grassland Science, Nanjing Agricultural University, Nanjing, 210095, China; College of Animal Science, Guizhou University, Guiyang, 550025, China. College of Agro-grassland Science, Nanjing Agricultural University, Nanjing, 210095, China; College of Grassland Science and Technology, China Agricultural University, Beijing, 100193, China. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China; Department of Environmental Studies, Dartmouth College, Hanover, NH, 03755, USA. College of Agro-grassland Science, Nanjing Agricultural University, Nanjing, 210095, China. College of Agro-grassland Science, Nanjing Agricultural University, Nanjing, 210095, China. Electronic address: sunxiao1014@njau.edu.cn. School of Biological Science and Engineering, Hebei University of Science and Technology, Yuxiang Street 26, Shijiazhuang, 050018, China" |
| DOI: | 10.1016/j.envpol.2020.115822 |
| ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
| Abstract: | "Understanding future climate change requires accurate estimates of the impacts of atmospheric nitrogen (N) deposition, composed of both inorganic and organic compounds, on greenhouse gas (GHG) fluxes in grassland ecosystems. However, previous studies have focused on inorganic compounds and have not considered the potential effects of organic N sources. Here, we conducted a grassland experiment that included organic, inorganic N, and a mix of them at a ratio of 4:6, with two input rates, to study N inputs induced CO(2), CH(4,) and N(2)O fluxes, as well as the potential abiotic and biotic mechanisms driving the fluxes. We found that N compositions significantly affected fluxes each of the three GHGs. Greater organic N decreased the impacts of N addition on CO(2) and N(2)O emissions, caused primarily by low rates of increase in substrates (soil available N) for production of CO(2) and N(2)O resulting from high ammonia volatilization rather than changes in microbial activity. Also, greater organic N slightly stimulated CH(4) uptake. Nitrogen composition effects on CO(2) emissions and CH(4) uptake were independent of N input rates and measurement dates, but N(2)O emissions showed stronger responses to inorganic N under high N addition and in June. These results suggest that future studies should consider the source of N to improve our prediction of future climate impact of N deposition, and that management of N fertilization can help mitigate GHG emissions" |
| Keywords: | *Carbon Dioxide/analysis Ecosystem Environmental Monitoring Grassland Methane/analysis *Nitrogen Nitrous Oxide/analysis Soil Composition Greenhouse gas Nitrogen addition Organic nitrogen; |
| Notes: | "MedlineChen, Jihui Zhang, Yingjun Yang, Yi Tao, Tingting Sun, Xiao Guo, Peng eng England 2020/11/02 Environ Pollut. 2021 Jan 1; 268(Pt A):115822. doi: 10.1016/j.envpol.2020.115822. Epub 2020 Oct 20" |
