冬小麦单产的光谱数据估测模型研究

 本文在分析冬小麦群体经济产量与叶面积系数关系的基础上，以地面实测冬小麦反射光谱数据为依据，提出了一种新的动态VI-产量模型，即LAD-产量模型。该模型具有冬小麦生育后期(抽穗一灌浆末期)光合面积和光合时间等信息，其冬小麦单位面积产量(简称单产)估测精度为98%。另外，本文根据常用的某一特定生育期VI-产量模型，用冬小麦各生育期的VI值分别估测小麦单产，确定山东省禹城市冬小麦的灌浆中期为最佳估产时间。此时期．小麦单产估测精度为96%。

A STUDY ON THE MODEL FOR ESTIMATING WINTER WHEAT YIELD USING SPECTRAL DATA OF WHEAT FIELD

A new dynamic vegetation index (VI)-yield model, that is, the leaf area duration (LAD)-yield model was structured for estimating winter wheat yield according to the measured reflection spectral data on the wheat field, and the relationship between wheat yield and LAI. The model had the information on the photosynthetic area and time during the later period of wheat growth, i. e., the period from the heading stage to the end of filling stage. The accuracy of the estimated wheat yield arrived up to 98% .In addition, the winter wheat yield was also estimated by a VI-yield model in a given wheat growing stage, and the VI in several main wheat growing stages were used for this purpose. The results suggested that the best season for estimating wheat yield using the VI-yield model was in the middle of wheat filling stage for the case study in Yucheng, Shandong province. The accuracy of the estimation could arrive at 96%.