| Technology and Methodology |
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Inversion of available nitrogen content in hilly paddy soil of southern China based on hyperspectral characteristics |
| GUO Xi1,2,3, YE Yingcong3, XIE Biyu3, KUANG Lihua3, XIE Wen3 |
1. Institute of Soil Fertilizer and Resources Environment, Jiangxi Academy of Agricultural Science, Nanchang 330200, China;
2. Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciecnce, Beijing 100081, China;
3. Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province, Jiangxi Agricultural University, Nanchang 330045, China |
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Abstract To analysis the relationship between the hyperspectral reflectance in the visible/near infrared bands and available nitrogen (AN) in paddy soil in southern China hilly areas, the authors collected the hyperspectral reflectance of paddy soil and made analysis with spectral analysis methods with the purpose of discovering the spectral characteristics of field reflectance and its influencing factors. The spectral indices were derived, and then paddy soil AN predicting model based on the correlation between AN content and spectral indices was built. The results were as follows:The different AN content paddy soil reflectance curves showed the tendency that, with the increase of AN content, the spectral reflectance decreased and the absorption depth became greater;by analyzing the correlation coefficient of paddy soil AN content and 16 kinds of mathematical transformations of spectral reflectance, the sensitive wavelengths were extracted, which were 694 nm, 2 058 nm and 2 189 nm; the predicting model for paddy soil AN content was built with spectral resample reflectance at 694 nm, 2 058 nm and 2 189 nm as independent variables and AN as dependent variable, and the coefficients of determination R2 of the model was 0.56, suggesting that the model is quite good in stability and predictability.
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| Keywords
ecosystem services value
MODIS NDVI data
TM image
Hebei Province
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Issue Date: 02 March 2015
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2015,
Vol. 27
