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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。
In order to establish a rapid and effective technical system for evaluating the biological control effect of ragweed, the change rule of canopy spectral reflectance after using ragweed tortoise furrow was studied by using multi-band spectroradiometer based on imaging remote sensing technology. Canopy Spectral Eigenvalue Evaluation of Control Effects of Diabrotica philoxeroides on. Larvae canopy feeding can cause changes in the canopy spectrum of ragweed. In the 560 nm green zone and 710 ~ 810 nm in the near infrared region, with the increasing degree of feeding, the canopy spectral reflectance Gradually decreased. At 660 nm in the yellow zone, the reflectance of ragweed canopy gradually increased with the increase of the degree of feeding. After the ragweed was fed on Diabrotica philoxeroides, the normalized vegetation index, ratio vegetation index, difference vegetation index and recalibration index of vegetation were significantly lower than those of the non-fed control group. The spectral reflectance of canopy at 560 nm in the visible light green region and 710 nm and 760 nm in the near infrared region were negatively correlated with their degree of feeding. Therefore, the visible light green region 560 nm, the near infrared region 710 nm And 760 nm as the sensitive band of the three bands.