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| UV-B radiation facilitates the transformation of carbon and nitrogen in red paddy soils |
| Received:November 03, 2016 |
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| KeyWord:UV-B radiation;paddy soils;carbon/nitrogen transformation;total organic carbon(TOC);dissolved organic carbon(DOC) |
| Author Name | Affiliation | E-mail | | XU Peng | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | WANG Qiu-min | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Xiangyang Environmental Monitoring Station, Hubei, Xiangyang 441000, China | | | JIANG Meng-die | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | LIN Shan | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | WU Lei | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | ZHAO Jin-song | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | HU Rong-gui | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Ecological Environment Center, Huazhong Agricultural University, Wuhan 430070, China | rghu@mail.hzau.edu.cn |
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| Abstract: |
| Two red paddy soils developed out of the same parental material with contrasting content of soil organic matter were selected to study the effects of UV-B radiation on soil carbon and nitrogen transformation. Results showed that soil total organic carbon(TOC) content decreased while dissolved organic carbon(DOC) content increased with increasing UV-B radiation level. UV-B radiation facilitated soil organic carbon decomposition and increased soil nitrate. Exposed to the strongest UV-B radiation(2.83 W·m-2) for 96 h caused that TOC decreased by 9.89% and 10.16%, DOC increased by 39.24% and 50.50%, and NO3--N increased by 74.48% and 81.87% in soils with low and high content of organic matter, respectively. Therefore, in order to protect the carbon pool and reduce nitrogen lose in the agricultural practice, the soil surface should avoid exposing to UV-B radiation as much as possible. |
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