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本文对白粉菌侵染后田间小麦叶片叶绿素含量与光谱反射率的关系进行了研究。用不同浓度的药液控制田间病害的发生梯度,于灌浆期对不同严重度小麦冠层的光谱反射率进行了测量,同时测定小麦叶绿素含量并调查病情指数,分析叶绿素含量与病情指数、冠层光谱反射率的关系。结果表明,药剂对叶绿素含量无显著影响;受白粉病危害后,小麦叶片叶绿素含量明显降低,抗性不同的品种之间下降速度存在差异,与病情指数之间也有极显著的相关性。绿光波段与叶绿素含量之间的相关性达到了显著水平;基于多波段建立的模型要优于单波段,可以利用绿光、红光波段的反射率估计叶绿素含量。红边参数与叶绿素含量之间也有较好的相关性,其中以红边面积的相关系数最大。
In this paper, the relationship between chlorophyll content and spectral reflectance of wheat leaves after inoculated with powdery mildew was studied. With different concentration of liquid to control the gradient of field disease, the spectral reflectance of different severity wheat canopies at grain filling stage was measured. The chlorophyll content in wheat was also measured and the disease index was investigated. The chlorophyll content and disease index, Spectral reflectance. The results showed that the agent had no significant effect on the content of chlorophyll. After the powdery mildew was endangered, the content of chlorophyll in wheat leaves was significantly decreased. There was a difference in the rate of decline between the varieties with different resistances, which was also significantly correlated with the disease index. The correlation between green band and chlorophyll content has reached a significant level. The model based on multi-band is better than single band, and the green and red band reflectivity can be used to estimate the content of chlorophyll. There is also a good correlation between red edge parameters and chlorophyll content, of which the correlation coefficient of red edge area is the largest.