基于光谱参数的棉花叶面积指数监测和敏感性分析  

Monitoring of the Leaf Area Index of Cotton Based on Spectral Parameters and the Sensitivity Study

作　　者：陈江鲁[1] 王克如[1,2] 李少昆[1,2] 肖春华[1] 陈兵[3] 王方永[1] 金秀良[1] 吕银亮[1] 刁万英[1] 王琼[1] 王楷[1] 何晟国 

机构地区：[1]新疆兵团绿洲生态农业重点开放实验室/石河子大学,新疆石河子832003 [2]中国农业科学院作物科学研究所/国家农作物基因资源与基因改良重大科学工程,北京100081 [3]新疆农垦科学院棉花研究所,新疆石河子832000 [4]甘肃省古浪县黄花滩乡农业综合服务中心,甘肃古浪733100

出　　处：《棉花学报》2011年第6期552-558,共7页Cotton Science

基　　金：国家自然科学基金(30860139);国家自然科学基金(41161068);国家科技支撑计划(2007BAH12B02);"863"计划(2006AA10A302)

摘　　要：研究棉花冠层光谱参数对不同叶面积指数的响应,建立棉花叶面积指数光谱参数最佳估测模型,并对所选光谱参数进行敏感性分析。利用高光谱仪测定不同时期不同叶面积指数条件下的棉花冠层光谱反射率。结果表明,694 nm和1099 nm分别为可见光和近红外波段区域内与叶面积指数相关性最好的波段,并用于改进前人所建立的光谱参数;宽范围动态植被指数和比值植被指数与叶面积指数的拟合效果最好,估测模型的决定系数(r2)分别为0.8375和0.8324;此外,比值植被指数对棉花叶面积指数变化的敏感性大于宽范围动态植被指数。Leaf area index （LAI） is one of the key structural parameter for cotton canopy. The objectives of this study were to determine the relationships between spectral parameters and LAI so that the optimum regression models for estimating LAI were developed in cotton, and to analysis the sensitivity of these spectral parameters. The reflectance spectra of canopy were measured using a field radiometric spectrometer in different canopy LAI in the different growth stages of cotton. The results showed that the maximum sensitivity of reflectance to variation in leaf area index, 694 nm and 1099 nm, were found in visible and near-infrared spectrum, respectively. Hence, previous established spectral parameters were modified using reflectance of these two wavebands. Furthermore, the models to retrieve LAI using wide dynamic range vegetation index（WDRVI） and ratio vegetation index（RVI） were most feasible with the maximum determination coefficients （r2） （0.8375 and 0.8324, respectively）. Additional, RVI showed higher sensitivity to LAI than WDRVI consistently.

关 键 词：光谱参数 叶面积指数 估测模型 敏感性 

分 类 号：S562[农业科学—作物学]