期刊
ATMOSPHERIC ENVIRONMENT
卷 185, 期 -, 页码 159-167出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2018.05.009
关键词
Nitrogen forms; CO2 emissions; Coastal wetlands; Yellow river delta
资金
- National Natural Science Foundation of China [41501099]
- Natural Science Foundation of Shandong Province [ZR2014DQ015, ZR2016DM14]
- Doctoral Research Foundation of Liaocheng University [318051430]
- Experimental Technology Foundation of Liaocheng University [26322170123]
Human activities have increased atmospheric nitrogen (N) deposition, in turn changing CO2 emissions. Many studies concentrated on the relationships between the amount of N deposition and CO2 emissions. However, how N forms affect CO2 emissions is still poorly understood. A two-year field experiment was conducted to investigate the effects of N forms on CO 2 emissions in the coastal wetlands of the Yellow River Delta. The N forms consisted of nitrate (NaNO3), ammonium (NH4Cl) and organic N (urea-N: glycin-N = 1: 1), and the level of N addition was 8 g N M-2 yr(-1) . The CO2 emissions were measured in the growing season from April to October. The results showed that three types of N addition stimulated CO2 emissions (P < 0.05). Compared with the control treatment, nitrate, ammonium and organic N additions increased CO2 emissions by 23.24%, 32.92% and 49.02%, respectively. Nitrate and ammonium additions produced similar and positive effects on CO2 emissions, whereas organic N addition had larger and positive effects on CO2 emissions than those of inorganic N addition (P < 0.05). This may be attributed to the following reasons. First, three types of N addition tended to increase soil 0-glucosidase activity and Q(10) value of CO2 emissions, but only organic N addition significantly enhanced soil -glucosidase activity and Q(10) value (P < 0.05). Second, inorganic N addition had neutral and negative effects on the decomposition of soil organic carbon (SOC), whereas organic N addition increased SOC decomposition compared with control treatment (P < 0.05). Together, these findings highlight the significance of differentiating the influences of N forms on CO2 emissions.
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