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基于碳同化的群體光合速率測量系統(tǒng)設(shè)計與試驗
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國家重點研發(fā)計劃項目(2020YFD1100602)、陜西省重點研發(fā)計劃項目(2021ZDLNY03-02)和中央高?;A(chǔ)研究基金項目(2452020292)


Carbon Assimilation-based Plant Population Photosynthetic Rate Measurement System
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    摘要:

    不同植株葉位,、葉齡和所處環(huán)境的導(dǎo)致單葉光合速率存在明顯差異,使其在表征整株光合能力和物質(zhì)積累效率等方面存在不足,。本文以設(shè)施蔬菜為研究對象,,基于透明同化箱設(shè)計基于碳同化過程的群體光合速率測量系統(tǒng),系統(tǒng)通過高精度光輻射傳感器和SCD30對同化箱內(nèi)光照強度,、CO2濃度,、溫濕度進行采集,實現(xiàn)了同化箱光環(huán)境的精確控制,、碳同化過程測量,、溫濕度控制等功能。試驗與LI-6800型閉路碳同化測量系統(tǒng)同步進行,,采用線性擬合計算CO2濃度變化量進而獲取群體光合速率,,分析測量系統(tǒng)性能及不同光溫條件和作物品種碳同化過程的檢測精度。結(jié)果表明系統(tǒng)氣密性和光調(diào)控精度良好,,最大漏氣速率為0.0473μmol/(mol·min),,單次測量(6min)最大漏氣量為0.2838μmol/mol,光環(huán)境調(diào)控精度平均標準差為2.71μmol/(m2·s),,能夠滿足植株碳同化過程的檢測要求,。通過線性相關(guān)性分析,生菜單株/多株CO2交換量擬合R2分別為0.988,、0.874,,均方根誤差分別為5.82,、5.80μmol/mol,番茄線性擬合R2為0.952,,均方根誤差為3.39μmol/mol,,結(jié)果表明系統(tǒng)測量性能與LI-6800型閉路碳同化測量系統(tǒng)性能接近,且在直立生長植株的檢測性能更好,;通過光響應(yīng)曲線擬合計算,,番茄和生菜在不同溫度、光照條件下,,系統(tǒng)與LI-6800型閉路碳同化測量系統(tǒng)光響應(yīng)曲線間平均絕對誤差均值分別為0.45,、0.35μmol/(m2·s),擬合R2均值不小于0.95,,證明系統(tǒng)能實現(xiàn)群體光響應(yīng)曲線的高精度穩(wěn)定測量,。

    Abstract:

    Single-leaf photosynthetic rate significantly affected by leaf location, leaf aging, and environment is insufficient to characterize the photosynthetic capacity and material accumulation efficiency of the entire plant. A plant population photosynthetic rate measurement system (PPPMS) was developed based on the carbon assimilation process using a transparent assimilation box. The PPPMS collected the data on light intensity, CO2 concentration, temperature and humidity in the assimilation box using a high-precision light radiation sensor and SCD30 to achieve the accurate control of the light environment, measurement of the carbon assimilation process, temperature and humidity control and so on. The synchronous experiment was carried out with the LI-6800 closed-circuit carbon assimilation measurement system, and the population photosynthetic rate was determined using linear fitting with the CO2 changes. The performances of the PPPMS and the detection accuracy of carbon assimilation process were evaluated at various lights, temperatures and crop types. The findings revealed that the system’s air tightness and light regulation accuracy were satisfactory, with the maximum air leakage rate of 0.0473μmol/(mol·min), the maximum single air leakage (6min) of 0.2838μmol/mol. And the average standard deviation of light regulation accuracy was 2.71μmol/(m2·s), which can meet the detection of plant carbon assimilation process. In the linear correlation analysis, the R2 of CO2 exchange capacity fitting of single and multiple lettuces were 0.988 and 0.874, respectively, with the root mean square error (RMSE) of 5.82μmol/mol and 5.80μmol/mol, while the fitting R2 of tomato was 0.952, and the RMSE was 3.39μmol/mol. The results showed that the system’s measurement performance was comparable to that of LI-6800 system, and the detection performance in upright plants was superior to that of leafy vegetables. Under varied temperatures and lighting, the average mean absolute errors (MAEs) of tomato and lettuce computed by light response curves between the PPPMS and LI-6800 system were 0.45μmol/(m2·s) and 0.35μmol/(m2·s),respectively, and the mean value of fitting R2 was not less than 0.95. It was demonstrated that the method can accurately and consistently measure the plant population’s light response curve.

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張軍華,陳丹艷,盧有琦,孫章彤,張海輝,胡瑾.基于碳同化的群體光合速率測量系統(tǒng)設(shè)計與試驗[J].農(nóng)業(yè)機械學報,2022,53(3):357-367. ZHANG Junhua, CHEN Danyan, LU Youqi, SUN Zhangtong, ZHANG Haihui, HU Jin. Carbon Assimilation-based Plant Population Photosynthetic Rate Measurement System[J]. Transactions of the Chinese Society for Agricultural Machinery,2022,53(3):357-367.

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  • 收稿日期:2021-12-20
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  • 在線發(fā)布日期: 2022-03-10
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