| Cite this article: | 周琳琳,丁林凯,阚飞,等.陇中半干旱区覆膜玉米净碳交换及其影响因素[J].灌溉排水学报,0,():-. |
| Zhou Linlin,Ding Linkai,Kan Fei,et al.陇中半干旱区覆膜玉米净碳交换及其影响因素[J].灌溉排水学报,0,():-. |
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| Net Carbon Exchange Of Film Mulched Maize And Its Influencing Factors In The Semi-arid Area Of Central Gansu Province |
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Zhou Linlin, Ding Linkai, Kan Fei, Liu Hongjuan, Wei Guoxiao
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College of resources and environment,Lanzhou University
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| Abstract: |
| 【Objective】The carbon cycle of farmland ecosystem plays an important role in the global climate change. In order to explore the net carbon flux characteristics and its influencing factors of the film mulched Maize Farmland Ecosystem in the semi-arid area of central Gansu, 【Method】The paper takes the film mulched maize Farmland Ecosystem in the semi-arid area of central Gansu as the research object, based on the vortex of the maize growing season (May 1, 2016 to September 14, 2016) The change characteristics of net CO2 flux (NEE) and the correlation between NEE and environmental factors in different growth periods were observed and analyzed. 【Result】The results showed that: (1) In the semi-arid area of central Gansu Province, the change of NEE showed a "U" curve in different growth periods, the peak value appeared between 12:00-13:00, and the intensity of carbon fixation was in the filling stage > mature stage > jointing stage > seedling stage. (2) On the seasonal scale, the change of NEE in the film mulched maize field ecosystem showed a "U" curve. During the whole growing season, the total value of NEE was - 1108.00 mgCO2 . m-2 . d-1, the average value was - 8.03 mgCO2 . m-2 . d-1, the minimum value was - 26.5 mgCO2 . m-2 . d-1 on August 1. (3)NEE was significantly correlated with par, air temperature and swdp, and correlated par > air temperature > swdp. NEE was positively correlated with soil temperature, but not significantly correlated with soil water content. |
| Key words: farmland ecosystem; net carbon flux; environmental factors |
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