| Cite this article: | 杨泽伟,王厚成,邱中齐,等.陇中地区玉米农田生态系统呼吸作用对温度的响应研究[J].灌溉排水学报,,():-. |
| YANG Zewei,WANG Houcheng,QIU Zhongqi,et al.陇中地区玉米农田生态系统呼吸作用对温度的响应研究[J].灌溉排水学报,,():-. |
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| DOI： |
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| Respiratory response of maize farmland ecosystem to temperature in Longzhong region |
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YANG Zewei, WANG Houcheng, QIU Zhongqi, ZHAO Zijing, WANG Fubing, WEI Guoxiao
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College of Earth and Environmental Science,Lanzhou University
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| Abstract: |
| 【Objective】Carbon flux changes in farmland ecosystems are mainly caused by crop photosynthesis and respiration in farmland. Accurate assessment of carbon emissions generated from the respiration of maize farmland ecosystems is significant for studying global carbon fluxes in terrestrial ecosystems. 【Method】The monitoring data of vorticity and soil water and temperature in maize farmland ecosystem from November 2020 to October 2021, analyzed the daily average change of respiratory rate (RE) and the monthly average change of respiratory sensitivity index (Q10) during the growing season, discussed the response of RE to temperature, and evaluated it with different models. 【Result】The results showed that the carbon emission rate of maize farmland ecosystem in the semi-arid region was unimodal, and the average daily maximum respiration rate was 11.49 μmol m-2s-1. Compared with the response of respiration intensity of air temperature (Ta) and different depth of soil temperature (Ts), the soil temperature (Ts20) has greater influence on the maize farmland ecosystem in the region. The temperature sensitivity index Q10 also showed unimodal changes during the growing season, with the maximum value occurring in August (2.66). 【Conclusion】The model with the best fitting effect (Q10 model) was selected, and through the fitting of each model, the annual respiratory carbon emission of maize farmland ecosystem in Longzhong region was between 863.71~990.18gC m-2 a-1. The degree to which farmland ecosystem respiration responds to temperature is related to the size of soil water. |
| Key words: Longzhong region; Vorticity correlation; Ecosystem respiration; Sensitivity of respiration |
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