北京麦蚜虫害的光谱测量与分析

The Spectra Measurement and Analysis of Wheat Aphid Disaster in Beijing

通过测定小麦生育期内叶绿素含量变化及分析叶绿素含量与麦蚜量间的动态关系 ,提出小麦蚜虫灾害遥感监测的植物生理学依据。通过 1 995、1 996和 1 998年的地面光谱测量 ,绘制出蚜量同小麦光谱的相关性曲线 ,证明利用小麦的反射光谱植被指数 RVI值监测麦蚜的可行性 ,并给出了确定小麦蚜虫防治点即百株蚜量 5 0 0头左右的 RVI值方法。为确定麦蚜虫害最佳防治时间提供依据。

Based on the measurement of chlorophyll content in the period of wheat growing and yielding and the relationship analysis between the content of chlorophyll and the amount of wheat aphid, this paper presented the basis of plant physiology for wheat aphid disaster monitoring using remote sensing technologies. The correlation curves addressing the relation between the amount of wheat aphid and the wheat spectra were figured out by ground spectral testing in 1995, 1996 and 1998, which verified the feasibility of wheat aphid disaster monitoring according to the ratio vegetation index of wheat spectral reflection, namely RVI. An approach of decision making for the time to wheat aphid preventing and curing was also offered, that is, what 's the RVI when the aphid amount was about 500 in 100 trunks of wheat. It resulted in the key technology presentation for wheat aphid disaster monitoring, especially the technique for deciding the best time for wheat aphid preventing and curing.