CAJ | 학술논문

设置不同施氮量处理的田间试验，研究不同施氮量条件下水稻齐穗期冠层高光谱响应特征的变化。结果表明：水稻冠层光谱反射率在不同施氮水平间存在明显差异，不同施氮量群体的冠层高光谱敏感波段主要存在于近红外区域和可见光区域，近红外区域（710～1350 nm）随施氮水平的增加反射率增加，施氮处理的反射率明显高于不施氮处理，在可见光范围内随施氮水平的增加，反射率有所降低。一阶导数光谱值在可见光区也随施氮水平的增加相应的升高，这种趋势在680～760 nm的红边区域表现最为明显，特别是720～740 nm的红边核心区对水稻不同的施氮量具有稳定的响应特征，冠层红边位置随施氮水平的增加向长波方向移动（红移），红边振幅随施氮水平的升高而升高。
설치불동시담량처리적전간시험，연구불동시담량조건하수도제수기관층고광보향응특정적변화。결과표명：수도관층광보반사솔재불동시담수평간존재명현차이，불동시담량군체적관층고광보민감파단주요존재우근홍외구역화가견광구역，근홍외구역（710～1350 nm）수시담수평적증가반사솔증가，시담처리적반사솔명현고우불시담처리，재가견광범위내수시담수평적증가，반사솔유소강저。일계도수광보치재가견광구야수시담수평적증가상응적승고，저충추세재680～760 nm적홍변구역표현최위명현，특별시720～740 nm적홍변핵심구대수도불동적시담량구유은정적향응특정，관층홍변위치수시담수평적증가향장파방향이동（홍이），홍변진폭수시담수평적승고이승고。
The field experiment of different nitrogen levels was designed and the response characteristics of canopy hyper-spectrum of rice in heading were studied .The results showed that the canopy spectral reflectance of rice had significant differences among different nitrogen levels ,and the hyper-spectral sensitive bands of rice canopy were mainly at the near infrared and visible light region .The reflectance at the near infrared region (710-1 350 nm) increased with the increasing nitrogen application ,the reflectance of the nitrogen treatment was significantly higher than that without nitrogen application;but at the visible region , the reflectance de-creased with the increasing nitrogen .The first derivative spectra at the visible region also increased with the in-creasing nitrogen ,the trend in the red edge region of 680-760 nm was the most obvious ,especially in the 720-740 nm core area of the red edge .The first derivative spectra of rice canopy at the core area of red edge had a stable response characteristics under different nitrogen levels .The red edge position of the canopy reflectance spectra shifted to the long wave direction ( red shift) with the increase of nitrogen level ,the red edge amplitude increased with the increase of nitrogen level .