基于地面通量觀測(cè)與MODIS數(shù)據(jù)估算玉米光能利用率

doi:10.12306/2021jms.0046

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基于地面通量觀測(cè)與MODIS數(shù)據(jù)估算玉米光能利用率
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                        10.12306/2021jms.0046
                    
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基金項(xiàng)目:江蘇省自然科學(xué)基金項(xiàng)目（BK20191139）；河南煙草公司許昌分公司項(xiàng)目（2020411000240073）；科技部氣象行業(yè)專項(xiàng)（GHHY201506018）

Retrieval of light use efficiency of maize based on surface flux observation and MODIS data

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基于地面通量數(shù)據(jù)和中分辨率成像光譜儀（Moderate-resolution Imaging Spectroradiometer，MODIS）數(shù)據(jù)，對(duì)玉米農(nóng)田生態(tài)系統(tǒng)光能利用率（Light Use Efficiency，LUE）進(jìn)行反演和分析。通過(guò)地表碳通量資料構(gòu)建了玉米農(nóng)田生態(tài)系統(tǒng)的LUE模型，分析了LUE的變化規(guī)律；通過(guò)比較不同參照波段、不同傳感器角度下計(jì)算的MOIDS光化學(xué)反射植被指數(shù)（Photochemical Reflectance Index，PRI）與LUE間的關(guān)系，構(gòu)建了MOIDS PRI反演玉米LUE的模型。結(jié)果表明：（1）玉米LUE呈現(xiàn)出明顯的季節(jié)和日尺度上的變化規(guī)律，季節(jié)變化表現(xiàn)為單峰形，白天的LUE呈現(xiàn)出"U"型變化規(guī)律；（2）相比較NDVI，PRI反演植被LUE有明顯優(yōu)勢(shì)，利用MODIS PRI_S與LUE的較好相關(guān)性，建立了PRI₄₈₈、PRI₅₅₁和PRI₆₆₇模型進(jìn)行LUE反演；（3）經(jīng)比較，MODIS PRI_S反演LUE時(shí)最適合的為PRI₅₅₁模型，其全向散射的模型具有通用性，而如果區(qū)分出后向散射數(shù)據(jù)則采用相應(yīng)的PRI₅₅₁后向散射模型更好；（4）利用LUE_a與全天平均LUE_d擬合模型與MODIS PRI₅₅₁瞬時(shí)模型聯(lián)合，可實(shí)現(xiàn)對(duì)日尺度的光能利用率的反演，其推廣應(yīng)用前景值得期待。

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In order to investigate the latent capacity of remote sensing vegetation index in retrieving the photosynthesis of maize agro-ecosystem, eddy covariance flux data and MODIS (Moderate-resolution Imaging Spectroradiometer) data were used to retrieve and analyze the Light Use Efficiency(LUE) of maize. The results showed that:(1) The maize LUE showed obvious temporal variation on the seasonal and daily scales. The seasonal variation showed a single-peak shape, and the diurnal LUE showed a ‘U-shaped’ variation; (2) Compared with NDVI, the PRI (Photochemical Reflectance Index) had obvious advantages in vegetation LUE retrieval, and PRI₄₈₈, PRI₅₅₁ and PRI₆₆₇ models were established for LUE retrieval by using the good correlation between MODIS PRIS and LUE; (3) In comparison, PRI₅₅₁ was the most suitable model for retrieval of LUE from MODIS PRIS, and its omni-directional scattering model was universal. If the back scattering data were distinguished, the corresponding back scattering PRI₅₅₁ model can be better; (4) Combination of fitting model of LUE_a and diurnal average LUE_d with MODIS PRI₅₅₁ model can realize the retrieval of LUE on a daily scale, and its application prospect was worthy to expect.

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郭建茂,郭彩云,李羚,錢婭,劉俊偉.基于地面通量觀測(cè)與MODIS數(shù)據(jù)估算玉米光能利用率.氣象科學(xué),2023,43(2):186-195 GUO Jianmao, GUO Caiyun, LI Ling, QIAN Ya, LIU Junwei. Retrieval of light use efficiency of maize based on surface flux observation and MODIS data. Journal of the Meteorological Sciences,2023,43(2):186-195

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收稿日期:2021-03-05
最后修改日期:2021-05-10
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在線發(fā)布日期: 2023-05-20
出版日期: 2023-04-15

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