基于光谱指数和偏最小二乘的棉花类胡萝卜素/叶绿素a比值估算

易秋香,刘英,常存,钟瑞森

Estimation of cotton Car/Chla ratio by hyperspectral vegetation indices and partial least square regression

Qiu-Xiang YI,Ying LIU,Cun CHANG,Rui-Sen ZHONG

表2 用于模型构建和验证的Car/Chla比值以及Car的统计特征

Table 2 Statistical information of the Car/Chla ratio and Car for calibration and validation datasets

尺度 Level 数据集 Dataset 样本数n Car/Chla比值Car/Chla ratio 类胡萝卜素Car (μg cm-2) 平均值Mean 取值范围 Range 标准偏差SD 平均值Mean 取值范围 Range 标准偏差SD 叶片尺度 Leaf level 总体All 141 0.286 0.109-0.495 0.081 13.49 3.97-23.06 3.99 验证样本Calibration 94 0.283 0.109-0.478 0.081 13.08 5.76-22.83 3.72 检验样本Validation 47 0.292 0.118-0.495 0.083 14.32 3.97-23.06 4.40 冠层尺度Canopy level 总体All 159 0.302 0.109-0.495 0.082 14.15 3.97-23.06 4.16 验证样本Calibration 104 0.300 0.109-0.440 0.082 13.88 5.76-20.93 3.91 检验样本Validation 55 0.306 0.118-0.495 0.082 14.55 3.97-23.06 4.51