苹果花期冠层反射光谱特征

    Reflective spectral characteristics of apple florescence canopy

    • 摘要: 苹果花期是果树生产与管理的关键阶段,对冠层反射光谱特征研究具有重要的理论和现实意义。该文以山东省栖霞市为研究区,通过实测的120棵苹果花期冠层反射光谱数据,在分析不同累计样本容量冠层反射光谱特征的基础上,用方差分析和相关分析的方法,系统地研究了苹果树有花与无花、不同花量、花期不同阶段、不同树龄及不同品种的冠层反射光谱特征。研究结果表明,随着累计样本容量的增加,冠层反射光谱曲线趋于稳定、平滑。有花与无花冠层光谱反射率在431~500、591~680、761~1 300 nm波段方差分析结果极显著(α=0.01);不同花量的冠层与391~513、598~687、711~1 193 nm波段的反射率显著相关(p<0.05);在670 nm“红谷”附近,反射率随花量的增加而增大,在近红外761~1 300 nm波段,反射率随花量的增加而减小;不同品种之间,除嘎啦外,红富士、金帅和新红星之间不易区分。研究结果揭示了高光谱遥感在苹果花期信息获取方面的巨大潜力,为今后遥感反演模型的构建提供了依据。

       

      Abstract: The apple florescence is a key stage for apple production and management, and the study of apple canopy reflective spectral is of important theoretical and practical significance. Qixia City, Shandong Province was selected as the study area, and reflective spectral data of 120 apple florescence canopies were obtained. Based on the effects of different sample numbers on reflective spectral, the reflective spectral characteristics of apple florescence canopies with and without flowers, with different amount of flowers, at different florescence stages, and with different ages and species of apple trees were systematically studied by using variance and correlation analysis methods. The results indicated that with the increase of cumulative sample numbers, the reflective spectral curves of apple florescence canopies became stable and smooth. In the wave bands of 431-500, 591-680 and 761-1 300 nm, the variance analysis results of canopies with and without flowers were very significant (α=0.01). Results showed that the correlations of canopies with different amount of flowers with reflectances in 391-513, 598-687 and 711-1 193 nm wave bands were significant (p<0.05). Reflectance increased at the 670 nm Red Valley and decreased in the near-infrared band of 761-1 300 nm with the increase of flower amount. Reflective spectral characteristics among different apple species of Red Fuji, Jinshuai and New Red Star were hard to be distinguished except that for Gala. These results revealed the tremendous potential of capturing information of apple florescence with hyperspectral measurement, and it provided the references for constructing retrieval models of remote sensing.

       

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