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| Natural abundance of a volatile nitrogen isotope of ammonia under different land uses |
| Received:January 06, 2022 |
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| KeyWord:land use;ammonia volatilization;nitrogen natural isotopic abundance;impact factors;source identification |
| Author Name | Affiliation | E-mail | | BAI Xiao | 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
Changshu Agro-ecological Experimental Station, Chinese Academy of Sciences, Changshu 215555, China | | | TI Chaopu | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Changshu Agro-ecological Experimental Station, Chinese Academy of Sciences, Changshu 215555, China | cpti@issas.ac.cn | | YAN Xiaoyuan | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Changshu Agro-ecological Experimental Station, Chinese Academy of Sciences, Changshu 215555, China | | | LI Miao | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Changshu Agro-ecological Experimental Station, Chinese Academy of Sciences, Changshu 215555, China | | | TAO Limin | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Changshu Agro-ecological Experimental Station, Chinese Academy of Sciences, Changshu 215555, China | | | PENG Lingyun | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Changshu Agro-ecological Experimental Station, Chinese Academy of Sciences, Changshu 215555, China | | | ZHOU Wei | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Changshu Agro-ecological Experimental Station, Chinese Academy of Sciences, Changshu 215555, China | |
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| Abstract: |
| To explore the natural abundance of nitrogen isotopes volatilized from soil during ammonia (NH3) production from different land uses, we conducted a 15-day incubation experiment using the sponge absorption method under controllable conditions using vineyard, vegetable, and forest soils. The δ15N values were measured throughout the NH3 volatilization process. The results showed that the NH4+-N concentration in the three types of soil initially increased and then decreased. The NO-3-N concentrations of vineyard and vegetable soils continuously increased from the first day onward. The soil pH values peaked on the first day after urea application, and all soil pH values initially increased, decreased, then increased again. The δ15N-NH4+ values of vegetable and vineyard soils increased during the incubation period, while the δ15N-NH4+ values of forest soil first decreased then increased. The δ15N-NH3 values of vineyard, vegetable, and forest soils ranged from -27.98‰~-13.29‰, -29.26‰~-18.52‰, and -9.85‰~10.22‰, respectively. The mean δ15N-NH3 value was the lowest in the vegetable soil, followed by the vineyard and forest soil. Further analysis shows that soil pH, NH4+ concentration, and cumulative NH3 loss significantly influenced δ15N-NH3 values. A source trace model showed that different δ15N-NH3 values could result in large differences in the source contribution of NH3, revealing the importance of exploring source signatures under different soil conditions. |
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