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| Effect of fertilization on CH4 and N2O emissions from paddy soils under shading conditions |
| Received:August 13, 2020 |
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| KeyWord:shading;fertilization;silicate supply;rice;greenhouse gas emission intensity |
| Author Name | Affiliation | E-mail | | WANG Kun | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | LOU Yun-sheng | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | yunshlou@163.com | | XING Yu-yuan | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | LIU Jian | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | |
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| Abstract: |
| The decrease in solar radiation is one of the main issues of climate change. Few reports on the effects of decreased solar radiation and fertilization on methane(CH4)and nitrous oxide(N2O)emissions under paddy field conditions are available. A field experiment was conducted to investigate the effects of compound fertilizer and silicate fertilization on rice yield and the emissions of CH 4 and N2O under shading conditions. An orthogonal experimental design was adopted with 3 factors and 3 levels. Shading conditions were set at three levels:No shading(S0, 0% shading rate), from flowering period to maturity period shading(S1, 64% shading rate), and from tillering period to maturity period shading(S2, 64% shading rate). NPK compound fertilizer was set at three levels:100 kg·hm-2(F1), 200 kg·hm-2(F2), and 300 kg·hm-2(F3); silicate fertilizer was set at three levels:No silicate fertilizer(R0), slag fertilizer 200 kg·hm-2(R1), and slag fertilizer 400 kg·hm-2(R2). Results showed that shading significantly reduced rice yield. Compared with S0, S1 and S2 reduced rice yield by 43.33% and 48.51%, respectively. Shading significantly reduced the cumulative amount of CH4 emissions. Compared with S0, S1 and S2 reduced the cumulative amount of CH4 emissions by 7.46% and 57.71%, respectively. NPK compound fertilization significantly increased the cumulative amounts of CH4 and N2O emissions. Compared with F1, F2 and F3 increased the cumulative amounts of CH4 emissions by 48.34% and 57.03%, respectively and increased the cumulative amounts of N2O emissions by 85.81% and 192.98%, respectively. Compared with control(R0), R1 decreased by 20.42%, while R2 increased by 17.56%. CH4 warming potential accounted for more than 91% of the total greenhouse effect. CH4 emissions in rice fields played a major role in the total greenhouse effect of rice fields. This study suggests that the control of fertilization amount is helpful in decreasing sustained-flux global warming potential(SGWP)and greenhouse gas emission intensity(GHGI), while ensuring rice yield production under decreased solar radiation. The optimal combination in this study is 100 kg·hm-2(F1)and 400 kg·hm-2(R2). |
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