高光谱研究不同施肥条件对冬小麦冠层光谱的影响

doi:10.3964/j.issn.1000-0593(2020)02-0535-08

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Abstract Quantitative study of the relationship between soil nutrient content and canopy spectral characteristics of winter wheat based on hyperspectral techniques can provide theoretical basis and technical support for winter wheat nutrient abundance monitoring and scientific and rational guidance of fertilization programs. In a 35-year long-term positioning experiment, the effects of different fertilization treatments on the spectral characteristics of winter wheat canopy in different growth stages of Loess Plateau were studied. The results showed that under single fertilization conditions, compared with no fertilization (CK), from the jointing stage to the heading stage of the winter wheat, the CR₅₀₀, CR₆₇₀ and CR₅₅₀ values of single P application were higher, while the spectral reflectance of single N and M application was significantly lower. The CR₅₀₀ values of single P, N and M application in jointing stage were 1.2 times, 74.9% and 70.5% of CK; CR₆₇₀ values were 1.2 times, 66.8% and 62.6% of CK; CR₅₅₀ values were 1.2 times, 76.2% and 76.9% of CK, respectively. The peaks and valleys of the reflex characteristics of winter wheat were significantly enhanced at heading stage than those at jointing stage, at heading stage，the CR₅₀₀ values of P, N and M application were 1.2 times, 81.0% and 53.5% of CK; the CR₆₇₀ values were 1.3 times, 76.8% and 40.6% of CK; CR₅₅₀ values were 1.2 times, 78.5% and 63.4% of CK, respectively. At the filling stage, the peaks and valleys of the reflex characteristics of each treatment were obviously weakened; to the maturity stage, the difference between the peaks and valleys of the winter wheat spectrum under different fertilization treatments was no longer obvious. The spectral characteristics of the red band position absorption valley under single fertilization conditions after enveloping line removal showed that, except for the maturity period, the red band absorption valley area (A), the red band absorption valley left area (AL) and the absorption peak symmetry (S) of winter wheat with single P application were higherthan CK, both with N and Mapplication were lower than CK. Under the combined fertilization conditions, the NMP, NP and NM of all nitrogen application combinations showed similar patterns, and the red, blue absorption depth and green reflection peak and the near-infrared spectral reflectance in the visible light range were significantly lower than CK; the spectral reflectance eigenvalue of the PM combined treatment was slightly lower than CK. Compared with CK, the characteristic value of spectral reflectance of PM combined treatment was slightly lower from the jointing stage to the heading stage; the difference between the spectral reflectance values of NM, NPM and NP treatment was small but significantly lower than CK. The CR₅₀₀ values of NM, NPM and NP treatment were 25.85%, 27.99% and 26.07% of CK; CR₆₇₀ values were 12.56%, 13.27% and 13.98% of CK; CR₅₅₀ values were 33.39%, 35.38% and 37.04% of CK, respectively. The CR₅₀₀, CR₆₇₀ and CR₅₅₀ values of PM treatment were 67.52%, 55.69% and 79.40% of CK, respectively. At grain filling stage, the peaks and valleys of each treatment were significantly weaker than those at heading stage. At maturity stage, the spectral reflectance absorption characteristics of different fertilization treatments were not significantly different, but they were significantly lower than CK. The spectral characteristics of red band absorption valley under combined fertilization conditions after enveloping line removal showed that the area of red band absorption valley (A) of the winter wheat was the largest in CK, followed by PM treatment and NM treatment.

Key words：Winter wheat; Fertilization conditions; Long-term positioning experiment; Hyperspectral

Received: 2019-01-02 Accepted: 2019-05-10

ZTFLH:

O433.1

Corresponding Authors: SUN Wen-yi E-mail: sunwy@ms.iswc.ac.cn

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2020)02-0535-08 OR https://www.gpxygpfx.com/EN/Y2020/V40/I02/535

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