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| Characteristics of soil greenhouse gas fluxes under different forest types in the Loess Plateau tableland, China |
| Received:June 26, 2018 |
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| KeyWord:pure forest;mixed forest;greenhouse gas;environmental factors;Loess Plateau tableland |
| Author Name | Affiliation | E-mail | | ZHANG Jie | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China
Key Laboratory of Agri-Environment, Ministry of Agriculture, Beijing 100081, China | | | LIU Meng-yun | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China
Key Laboratory of Agri-Environment, Ministry of Agriculture, Beijing 100081, China | lmy471993@163.com | | ZHANG Meng-meng | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China
Key Laboratory of Agri-Environment, Ministry of Agriculture, Beijing 100081, China | | | YANG Jing-han | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China
Key Laboratory of Agri-Environment, Ministry of Agriculture, Beijing 100081, China | | | CAO Run-shan | College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and Agri-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China
Key Laboratory of Agri-Environment, Ministry of Agriculture, Beijing 100081, China | |
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| Abstract: |
| The study of characteristics of CO2, CH4, and N2O fluxes in soils of pure forest and mixed forest has great significance for evaluating the differences in greenhouse gas fluxes under different forest types. In this study, the flux laws and major influential factors of CO2, CH4, and N2O were compared using a static chamber and gas chromatography method based on seven typical pure forests and their mixed forests in the Loess Plateau tableland. The results showed that all forest types were sources of CO2 and N2O and sinks of CH4, and the differences in greenhouse gas fluxes among different forest soils were significant. Among the annual fluxes of soil CO2 and N2O, the mixed forest of Hippophae rhamnoides and Robinia pseudoacacia had the highest fluxes (130.73 mg·m-2·h-1 and 4.42 μg·m-2·h-1, respectively), while the Pinus tabuliformis pure forest (51.33 mg·m-2·h-1 and -0.06 μg·m-2·h-1, respectively) had the lowest. For the fluxes of soil CH4 uptake, the absorption flux of the P. tabuliformis pure forest was higher (60.82 μg·m-2·h-1) than that of any other forest, and that of the Biota orientalis pure forest (36.67 μg·m-2·h-1) was the lowest. The soil CO2 flux was positively correlated with soil temperature and negatively correlated with soil moisture content. Soil CH4 uptakes of the B. orientalis pure forest and mixed forest of H. rhamnoides and R. pseudoacacia were significantly positively correlated with temperature, and first increased and then decreased with the increase in 0~5 cm soil water content. Only the R. pseudoacacia pure forest and P. tabuliformis pure forest soil N2O fluxes were positively correlated with soil temperature. The results showed that the fluxes of greenhouse gases in soil were related to forest type, and that the flux characteristics were different under the influence of environmental factors. |
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