| Estimating chlorophyll density of cotton canopy in North of Xinjiang by using hyperspectral date |
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| DOI：10.7606/j.issn.1000-7601.2007.03.19 |
| Key Words: cotton hyperspectral chlorophyll density red-edge slope correlation analysis |
| Author Name | Affiliation | | YUAN Jie | The Oasis Key Laboratory of Ecological Agriculture of Xinjiang,Shihezi,Xinjiang 832003,China | | WANG Deng-wei | The Oasis Key Laboratory of Ecological Agriculture of Xinjiang,Shihezi,Xinjiang 832003,China | | HUANG Chun-yan | The Oasis Key Laboratory of Ecological Agriculture of Xinjiang,Shihezi,Xinjiang 832003,China | | QI Ya-qin | The Oasis Key Laboratory of Ecological Agriculture of Xinjiang,Shihezi,Xinjiang 832003,China | | CHEN Yan | The Oasis Key Laboratory of Ecological Agriculture of Xinjiang,Shihezi,Xinjiang 832003,China | | MA Qin-jian | The Oasis Key Laboratory of Ecological Agriculture of Xinjiang,Shihezi,Xinjiang 832003,China | | WANG Hong-ren | Regimental Farm 145 Agricultural Division 8 of Xinjiang,Shihezi,Xinjiang 832000,China |
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| Abstract: |
| Using the ASD Fieldspec FR spectrometer,the cotton spectrum and CH.D were measured at cotton key growth stages(two varieties and four levels of plant density,in North Xinjiang).Analyzing the variant rule of the spectrum and chlorophyll density(CH.D) of cotton canopy with growth stages.The results showed that the NDVI exponential index model has the highest correlation coefficient(r=0.722**,n=30)between Normalized Difference Vegetation Index(NDVI) and the CH.D,it can be used to extracted chlorophyll density of cotton canopy. There is a significantly correlation between red-edge slope and CH.D at 729 nm band of the first derivative(r=0.8499**,n=30).Then based on the first derivative data at band 729 nm of cotton Xinluozao No.19,established the linear regression model to estimate the CH.D of cotton Xinluozao No.13,The relationship between true CH.D value and estimative CH.D value is significant correlation(r=0.8818**,n=30).The estimated precise is 82.3%,RMSE is 0.254 g/m2. The study indicates that it can be quantificationally monitored cotton canopy CH.D by hyperspectral remote sensing data in Xinjiang. |
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