|
| Effects of application of nitrogen fertilizer and nitrification inhibitor on carbon dioxide emissions from calcareous soil |
| Received:January 19, 2017 |
| View Full Text View/Add Comment Download reader |
| KeyWord:calcareous soil;nitrogen fertilizer;nitrification inhibitor;soil pH;soil carbon release |
| Author Name | Affiliation | E-mail | | LI Xue-song | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | Sajjad Raza | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | LIU Zhan-jun | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | CHEN Zhu-jun | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | ZHOU Jian-bin | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | jbzhou@nwsuaf.edu.cn |
|
| Hits: 2507 |
| Download times: 2786 |
| Abstract: |
| A field trial was conducted to study the effects of adding nitrogen(N) fertilizer and nitrification inhibitor(DCD) on CO2 emissions from calcareous soil in Yangling, Shaanxi. The treatments included a control to which no N fertilizer was added(N0) and two N fertilizer rates(160 and 220 kg N·hm-2, represented as N160 and N220, respectively) and their combinations with DCD(N160+DCD and N220+DCD, respectively). The soil pH, contents of mineral N(NH4+-N, NO3--N), and CO2 emissions were measured. The results showed that the application of N fertilizer significantly reduced soil pH in comparison with N0. The decreasing rates of soil pH were less when N fertilizer was added with DCD. Addition of DCD delayed the nitrification of the N fertilizer by about 20 days. The CO2 emissions from different N fertilizer treatments increased as the N rate increased when no DCD was added. Moreover, the maximum CO2 emissions from soil after the experiment(37 days after adding N fertilizer) was as high as 167.1 g·m-2. Compared with the N0 treatment, the amount of CO2 emissions from the N160 and N220 treatments increased by 20.9% and 25.7%, respectively. When DCD was combined with the N160 and N220 treatments, CO2 emissions from the soil decreased by 13.5% and 11.0%, respectively. This indicates that the application of N fertilizer affected both the release of organic carbon and inorganic carbon from the calcareous soil. Thus, the effect of N fertilizer on the release of inorganic carbon from soil needs more study. |
|
|
|
