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期 刊 ：植物保护学报 2011年

关键词：豚草；广聚萤叶甲；冠层光谱；成像光谱；控制效果；

Keywords:Ambrosia artemisiifolia, Ophraella communa, canopy spectrum, imaging spectrometer, control efficiency,

摘 要 ：为建立快速有效的豚草生物防治效果评价技术体系,采用基于成像光谱遥感技术的多波段光谱辐射仪,研究豚草被广聚萤叶甲取食后冠层光谱反射率的变化规律,并利用冠层光谱特征值评价广聚萤叶甲对豚草的控制效果。广聚萤叶甲的取食会引起豚草的冠层光谱发生变化,在绿光区560 nm和近红外区710~810 nm处,随着被取食程度的加重,豚草冠层光谱反射率逐渐降低;在黄光区660 nm处,随着被取食程度的加重,豚草冠层光谱反射率逐渐升高。豚草被广聚萤叶甲取食后,归一化植被指数、比值植被指数、差值植被指数、再归一化植被指数均显著低于未被取食的对照组。在可见光绿光区560 nm处和近红外区710 nm和760 nm处豚草冠层光谱反射率与其被取食程度均达到显著负相关,故可以将可见光绿光区560 nm、近红外区710 nm和760 nm这3个波段作为监测的敏感波段。

Abstract:In order to establish fast and efficient bio-control effect evaluation technique of ragweed, Ambrosia artemisiifolia, the canopy imaging spectrometer technique was used to detect the canopy spectrum reflectance of ragweed and to evaluate the control efficiency of flea beetle, Ophraella communa, on ragweed. The results showed that the damage of O.communa could cause the canopy spectrum reflectance changes of ragweed. The canopy reflectance of ragweed decreased with the increasing damage level of O.communa at 560 nm within the green light region and 710 to 810 nm within the near-infrared light region, whereas that at 660 nm within the red light region increased with the increasing damage level of O.communa. And the normalized difference vegetation index (NDVI), ratio of vegetation index (RVI), difference vegetation index (DVI) and renomalized difference vegetation index (RDVI) of ragweed fed by flea beetles were all less than that of CK. The canopy spectrum reflectance at the green light region of 560 nm and the near-infrared light region of 710 nm and 760 nm was significantly negatively correlated with the damage level of O.communa. The results indicated that the wavelengths of 560 nm, 710 nm and 760 nm can be used to evaluate the control efficiency of O.communa on A.artemisiifolia when using a multispectral radiometer.

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