| 【Objective】The study aimed to explore the characteristics of canopy spectral reflectance of Haloxylon
ammodendron seedlings, establish the best estimation model of soil nitrogen content in seedlings habitats based on hyper
spectral, and provide an important basis for real-time monitoring and accurate diagnosis of plant and soil nutrient status in
desert area. 【Method】 The H.ammodendron seedlings and soil of habitats in Guerbantonggute Desert were used as theresearch objectives. The canopy spectral reflectance of H.ammodendron seedlings were measured by the portable spectrometer.
Combined with the indoor analysis on the soil nitrogen content in seedlings habitats, Stepwise Regression Method was used
to analyze the relationship between canopy spectral reflectance and soil nitrogen content in seedlings habitats.【Result】
During the growth period, the relationship between the canopy first derivative spectral reflectance of seedlings and soil nitrogen
content was significantly positively correlated in the band ranges of 403-485 nm, 509-538 nm, 677-806 nm and 1 489-1
616 nm. There was extremely significantly positive correlation at the 428 nm, 516 nm, 751 nm, 801 nm and 1 534 nm, and the
correlation coefficient was maximum at 751 nm, which was the most sensitive wavelength.【Conclusion】Based on the canopy
first derivative spectral reflectance of seedlings at the sensitive bands, the inversion model Y=133.186X751+8.803 is established,
which shows that the determination coefficient is maximum and the relative error is minimum, with optimal fitting effect and
higher prediction precision. It can be used as the best estimation model for soil nitrogen content in H.ammodendron seedlings
habitats. |
