|
| Influence of earthworm activity on soil CO2 and N2O emissions by incorporating different C/N residues |
| Received:February 19, 2017 |
| View Full Text View/Add Comment Download reader |
| KeyWord:earthworm;straw returning;C/N;carbon dioxide;nitrous oxide |
| Author Name | Affiliation | E-mail | | WANG Zheng-yan | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | LEI Zi-yan | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | YE Zhi-xiong | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | WU Yu-peng | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtze River), Ministry of Agriculture, Wuhan 430070, China | wyp19851205@126.com |
|
| Hits: 2333 |
| Download times: 2559 |
| Abstract: |
| A microcosm incubation experiment was performed to assess soil CO2 and N2O emissions after different residues were added to the soil, with or without earthworm(Metaphire guillelmi) inoculation. Four residues(rapeseed cake, corn leaf, rice straw, and corn stalk) with different C/N were chopped and thoroughly mixed with soil. Treatments without residue addition were set up as the control. During the 60-day incubation, residue incorporation increased the soil CO2 and N2O emission fluxes. In addition, the fraction of CO2 emissions(EFs-C) showed a significant negative correlation with residue C/N(R2=0.827 3). Earthworm inoculation also increased the soil CO2 and N2O fluxes. In the treatment with rape cake, corn leaf, rice straw, and corn stalk incorporation and control, cumulative CO2 and N2O emissions were increased 0.3, 0.5, 0.9, 1.0, 1.8 times and 1.4, 1.7, 1.7, 1.4, 9.5 times, respectively, by earthworm inoculation and by the counterpart treatment without earthworm inoculation. However, further analysis showed that earthworms increased the fraction of N2O emissions(EFs-N) with rape cake incorporation, but decreased EFs-N with the incorporation of other residues. In addition, rape cake incorporation led to a quick increase inorganic N and dissolved organic carbon content at the beginning of incubation, while the incorporation of other residues led to comparatively lower inorganic N content compared to the counterpart control. Inorganic N content in high C/N residue treatments was slightly increased by earthworm inoculation, but it remained lower than the counterpart treatment without the incorporation of residues. Both earthworm inoculation and residue incorporation can stimulate CO2 and N2O emissions, but their interaction effects on EFs-N may vary by the different residue C/N values. |
|
|
|
