水稻叶片反射光谱诊断氮素营养敏感波段的研究

田间小区试验叶色差异明显而生育期相似的两品种第一和第三完全展开叶片光谱反射率与氮素营养相关性分析表明,不同品种同一叶位之间这种相关性变化规律一致,然而在不同叶位之间相关性变化不尽一致.进一步对比分析大田区域试验和小区试验叶片光谱反射率与氮素营养相关性发现两区域样本相同叶位之间相关性变化规律相同.分析第一、三完全展开叶叶片光谱反射率处理之间差异显著性表明,存在差异显著的波段范围主要集中在绿光(525～605 nm)、黄光(605～655 nm)和短波近红外光(750～1100nm)范围内.和叶片氮素含量之间相关性最大的波段主要为绿光(525～605 nm)和黄光(605～655 nm)范围,而短波近红外光范围与叶片氮素含量之间相关性最小.因此和IKONOS2、IKONOS4、MSS4、MSS6、MSS7、SPOT1、SPOT3、TM2、TM4、AVHRRCH1、AVHRRCH2相对应的绿光(525～605 nm)、黄光(605～655 nm)和短波近红外光(750～1100nm)是叶片反射光谱诊断氮素营养的敏感波段范围.

Sensitive band ranges of leaf spectral reflectance in diagnosis of rice nitrogen nutrition

The rice samples came from two experimental designs with different condition. From those samples the most upper expanded fully leaf and the third one were selected to measure leaf spectral reflectance using FieldSpec FR (350-2500 nm). Differences of leaf spectral reflectance among three N levels were analyzed by F test at tiller stage, booting stage, heading stage and milky stage respectively. And the correlation between leaf spectral reflectance and leaf nitrogen content based on dry weight were also analyzed. from the study of significant difference and the significant (insignificant) correlation, three sensitive band ranges were revealed which corresponded to the green, yellow and short wave near infrared (SW-NIR) regions. And they were as important as universal satellites bands IKONOS2, IKONOS4, MSS4, MSS6, MSS7, SPOT1, SPOT3, TM2, TM4, AVHRRCH1, and AVHRRCH2.