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《Acta Agriculturae Boreali-Occidentalis Sinica》 2015-11
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Correlation between Rice Canopy Spectral Reflectance and Leaf Chlorophyll under Different Fertilization

ZHANG Man;CHANG Qingrui;ZHANG Xiaohua;LIU Jiaqi;College of Resources and Environment,Northwest A&F University;  
Through the field experiment,the rice canopy spectral reflectance and chlorophyll content(SPAD)characteristics were measured under different fertilization and different development stages,then mathematical statistics methods was used to analyze the correlation of spectral vegetation index and chlorophyll content.The results showed that the spectral reflectance changed with different development stage,from jointing stage to heading stage,the spectral reflectance of the canopy was very small and no obvious difference in the visible band but spectral reflectance of the canopy was bigger in the near infrared region.From heading stage to milk stage,the spectral reflectance of the canopy was gradually getting bigger in the visible region and smaller in the near infrared region.The spectral differences were significant under different fertilization,in the near infrared region performance particularly evident,with the improvement of fertilizer levels,spectral reflectance was getting higher.With the increase of nitrogen level,the chlorophyll content of rice was growing.With the improvement of the level of biochar,chlorophyll content of rice increased,when biochar reached a certain value,the chlorophyll content decreased.During the whole growth period,except for the N0 treatment at milk stage,the PSSRa and PSSRb in other treatments were highly significantly associated with chlorophyll content.At jointing stage,the mSR705 and mND705 of C3 treatment was significantly negative correlation with chlorophyll content,other treatments were significant positive correlation.
【Fund】: 国家高新技术研究发展计划(2013AA102401);; 高等学校博士点专项科研基金(20120204110013)~~
【CateGory Index】: S511
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