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基于Landsat 8数据的龙竹冠层水平叶绿素含量反演研究

Inversion of Chlorophyll Content at Canopy Level of Dendrocalamus giganteus Based on Landsat 8 Data

    摘要
  • 摘要: 以云南新平县的龙竹为研究对象，以Landsat 8 OLI影像为主要数据源，结合35块样地实测数据，在PROSAIL模型参数敏感性分析的基础上建立龙竹叶片叶绿素含量（LCC）与冠层反射率的查找表。选择叶绿素指数（CI）及其与绿度指数（G）的比值（CI/G）来反演LCC，结合叶面积指数（LAI）得到冠层叶绿素含量（CCC）。结果表明：CI和CI/G反演LCC的R2分别为0.48和0.52，RMSE分别为11.09 µg/cm2和8.23 µg/cm2；CI和CI/G对CCC反演的R2分别为0.53和0.64，RMSE分别为0.50 g/m2和0.43 g/m2。研究结果可为龙竹区域监测提供技术支撑。

     

    Abstract: Taking Dendrocalamus giganteus in Xinping County of Yunnan Province as the research object, Landsat 8 OLI image as the main data source, combined with the measured data of 35 plots, based on the sensitivity analysis of PROSAIL model parameters, the look-up table of leaf chlorophyll content(LCC) and canopy reflectance of Dendrocalamus giganteus was established. The chlorophyll index(CI) and its ratio(CI/G) to the greenness index(G) were selected to invert LCC, and then the canopy chlorophyll content(CCC) was obtained by combining the leaf area index(LAI).The results show: The R2 for CI and CI/G inversion of LCC were 0.48 and 0.52, and RMSE was 11.09 µg/cm2 and 8.23 µg/cm2, respectively. The R2 for CI and CI/G inversion of CCC were 0.53 and 0.64, and RMSE was 0.50 g/m2 and 0.43 g/m2, respectively. The research results can provide technical support for regional monitoring of Dendrocalamus giganteus.

     

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