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首页> 外文会议>IFIP(International Federation for Information Processing) TC 12 International Conference on Computer and Computing Technologies in Agriculture(CCTA 2007); 20070818-20; Wuyishan(CN) >SPECTRUM CHARACTERISTICS OF COTTON CANOPY INFECTED WITH VERTICILLIUM WILT AND INVERSION OF SEVERITY LEVEL
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SPECTRUM CHARACTERISTICS OF COTTON CANOPY INFECTED WITH VERTICILLIUM WILT AND INVERSION OF SEVERITY LEVEL

机译：棉花黄萎病菌冠层的光谱特征及严重度反转

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摘要

Verticillium wilt of cotton is one of the diseases of cotton with extensive occurrence and maximal harming in our country even in the world. Hyper spectrum remote sensing with the fine spectrum information has becoming the efficient method to monitor the verticillium wilt of cotton. The research was conducted in Xinjiang, the largest cotton plant region of China. The paper used data which was collected both canopy spectrum infected with verticillium wilt and SL (severity level) in the year 2005-2006, the quantitative correlation were analyzed between SL and canopy reflectance spectrum, derivative spectrum. The tested results indicated that spectrum characteristics of cotton canopy infected with verticillium wilt had better regularity with the increase of SL in different periods and varieties. Spectrum reflectance increased in visible light region (620-700 nm) with the increase of the SL, which inverted in near-infrared region, and extreme signification in 780- 1300 nm. When SL got 25%, cotton canopy infected with verticillium wilt could be used as a watershed and diagnosed index in an early time. The tested results also indicated there were evident characteristics of first derivative spectrum in these SL, it changed significantly in red edge ranges (680 -760 nm) with different SL, red edge swing decreased, and red edge position equal moved to
机译：棉花黄萎病是我国乃至世界范围内发生率最高，危害最大的棉花病害之一。具有精细光谱信息的高光谱遥感已成为监测棉花黄萎病的有效方法。该研究在中国最大的棉花种植区新疆进行。本文采用2005-2006年黄萎病和冠心病严重程度的冠层光谱数据，分析了冠层光谱与冠层反射光谱，导数光谱之间的定量相关性。试验结果表明，不同时期，不同品种间，黄萎病菌感染的棉花冠层光谱特征随SL的增加而具有较好的规律性。光谱反射率随SL的增加而在可见光区域（620-700 nm）中增加，而SL在近红外区域中发生反转，而在780- 1300 nm中则具有极端意义。当SL达到25％时，感染黄萎病的棉花冠层可以作为早期分水岭和诊断指标。测试结果还表明，这些SL具有一阶导数光谱的明显特征，在不同SL的红色边缘范围（680 -760 nm）中，其显着变化，红色边缘摆动减小，并且红色边缘位置相等。

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