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| Effects of fulvic acid potassium on N transformation in and N2O emission from tobacco plantation soil |
| Received:October 29, 2019 |
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| KeyWord:fulvic acid potassium;tobacco plantation soil;nitrogen transformation;N2O;CO2 |
| Author Name | Affiliation | E-mail | | LI Qing-shan | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | WANG De-quan | Shandong Weifang Tobacco Co., Ltd., Weifang 261205, China | | | GAO Zheng-xu | Shandong Weifang Tobacco Co., Ltd., Weifang 261205, China | | | DU Chuan-yin | Shandong Weifang Tobacco Co., Ltd., Weifang 261205, China | | | GUAN En-sen | Shandong Weifang Tobacco Co., Ltd., Weifang 261205, China | | | CHENG Yi | School of Geography Sciences, Nanjing Normal University, Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China | | | WANG Shen-qiang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | sqwang@issas.ac.cn |
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| Abstract: |
| Here, we evaluated the effects of fulvic acid potassium on N transformation in and N2O emission from tobacco soil using a laboratory static-culture method. The experiment included five treatments with an equivalent N basis:CK, ammonium nitrate (200 mg N·kg-1); T1, ammonium nitrate + fulvic acid potassium (2.5 g·kg-1); T2, ammonium nitrate + fulvic acid potassium (5 g·kg-1); T3, ammonium nitrate + fulvic acid potassium (10 g·kg-1); and T4, ammonium nitrate + fulvic acid potassium (15 g·kg-1). When compared with the CK treatment, the fulvic acid potassium treatments significantly decreased the soil concentration of inorganic N, but the T3 and T4 treatments significantly increased the soil concentration of soluble organic N. Furthermore, the net mineralization and nitrification rates decreased with an increase in the addition rate of fulvic acid potassium, but they were significantly less than those of the CK treatment (P<0.05). The fulvic acid potassium treatment significantly increased the N2O and CO2 emission rates and cumulative emission compared with those of the CK treatment, and its effect significantly increased with an increase in the addition rate of fulvic acid potassium (P<0.05). In addition, there was a significant positive correlation between cumulative N2O emission and CO2 emission (R2=0.97, P<0.001). In summary, the addition of fulvic acid potassium promoted the net microbial immobilization of inorganic N, which could significantly decrease the soil concentration of inorganic N. Moreover, the addition of fulvic acid potassium stimulated denitrification, causing a significant increase in cumulative N 2O emission. Furthermore, a significant positive correlation between cumulative N2O emission and cumulative CO2 emission was observed, implying that cumulative CO2 emission can be used as a potential indicator to quantify cumulative N2O emission. |
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