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| Effect of different N fertilizer applications on CO2 emissions from Lou soil in Central Shaanxi |
| Received:January 26, 2017 |
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| KeyWord:nitrogen fertilizer;dry combustion;inorganic carbon;carbon emission |
| Author Name | Affiliation | E-mail | | MENG Yan | College of Natural Resource and Environment, Northwest A & F University/Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China
Weinan Agricultural Science Research Institute, Weinan 714000, China | | | LI Xue-song | College of Natural Resource and Environment, Northwest A & F University/Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | HAO Ping-qi | Weinan Agricultural Science Research Institute, Weinan 714000, China | | | ZHANG Ying-ke | Weinan Agricultural Science Research Institute, Weinan 714000, China | | | ZHANG Yong-min | Weinan Agricultural Science Research Institute, Weinan 714000, China | | | ZHOU Jian-bin | College of Natural Resource and Environment, Northwest A & F University/Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | jbzhou@nwsuaf.edu.cn |
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| Abstract: |
| This study aimed to explore the effect of different nitrogen fertilizer applications on CO2 emissions from Lou soil in Central Shaanxi. A closed-jar incubation experiment was arranged to estimate CO2 emissions from organic and inorganic sources of soil carbon(SOC and SIC). The soil was used with and without dry combustion. Soil was fertilized by the addition of three kinds of nitrogen fertilizers:NH4NO3, KNO3, and(NH4)2SO4. The amount of CO2 released, emission ratio, soil pH, and mineral nitrogen were determined. Results showed that soil pH significantly increased at the beginning of incubation after dry combustion, and the average pH was 9.66 on the first day. This was due to the removal of SOC, which rapidly decreased the soil buffer capacity. The ammonium-N content with the ammonium nitrogen fertilizer treatments without dry combustion decreased rapidly with time. After dry combustion, ammonium-N content of the(NH4)2SO4 treatment decreased, and the reduction was smaller than that in the treatments without dry combustion. There were no significant changes for the other two fertilizer treatments. In contrast to ammonium-N, the nitrate-N content with the ammonium nitrogen fertilizer treatments increased with time. For the soils without dry combustion, the amount of released CO2 was highest for the(NH4)2SO4 treatment, followed by that for the NH4NO3 and KNO3 treatments. The average release increment was 36.6% over that of CK. The(NH4)2SO4 treatment also had the highest release amount after dry combustion, with the average release amount increased by 24.5%. The estimated emission ratio of CO2 from SIC was 27.2%. Our study proved that in calcareous soil, CO2 can be released not only from SOC, but also from SIC. It is recommended that further studies address the relationship between changes in climate and SIC resulting from N fertilizer application, which affect CO2 evolution. |
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