| 引用本文: | 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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| 摘要: |
| 【目的】农田生态系统碳通量变化主要由作物光合作用和农田的呼吸作用引起。在陆地生态系统中，准确评估玉米农田生态系统的呼吸作用产生的碳排放量对全球碳通量的研究意义重大。【方法】使用甘肃省会宁县大山川村（属陇中半干旱区）玉米农田生态系统在2020年11月至2021年10月的涡度和土壤水分及温度监测数据，分析了玉米农田生态系统呼吸速率（RE）的日平均变化和呼吸敏感性指数（Q10）在生长季内的月平均变化，探讨RE对温度的响应，并用不同模型进行拟合评估。【结果】陇中半干旱区玉米农田生态系统的碳排放速率在年内呈单峰变化，日均最大呼吸速率11.49μmol·m-2·s-1，相比呼吸强度对空气温度（Ta）与不同深度土壤温度（Ts）的响应，深度为20cm处的土壤温度（Ts20）对该地区玉米农田生态系统的影响更大。温度敏感性指数Q10在生长季内同样表现出单峰性变化，最大值出现在八月（2.66）。【结论】选择拟合效果最好的模型（Q10模型），通过各个模型拟合得出陇中地区玉米农田生态系统年呼吸碳排放量介于863.71~990.18gC·m-2·a-1。农田生态系统呼吸对温度的响应程度与土壤水分的大小有关。 |
| 关键词: 陇中地区；涡度相关；生态系统呼吸；呼吸敏感性 |
| DOI： |
| 分类号:X |
| 基金项目:国家自然科学(41471023) |
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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 |
