为提高加拿大一枝黄花的治理效率,实现对其智能化监测,提出一种改进的YOLOv5(You Only Look Once)网络的检测方法。首先,在YOLOv5网络中添加通道注意力模块,在维持模型轻量化的基础上提高了目标检测精度。其次,在主干网络中添加SPD-Conv...为提高加拿大一枝黄花的治理效率,实现对其智能化监测,提出一种改进的YOLOv5(You Only Look Once)网络的检测方法。首先,在YOLOv5网络中添加通道注意力模块,在维持模型轻量化的基础上提高了目标检测精度。其次,在主干网络中添加SPD-Conv(Space-to-Depth Convolution)层,提高了网络对低分辨率图像以及小目标检测的效果。最后,采用自适应激活函数替换原网络的SiLU(Sigmoid Linear Unit)激活函数,在网络快速收敛的同时提高了网络的泛化能力。实验结果表明,改进的YOLOv5网络精度均值较原网络提高了5.8%,改进后的网络收敛速度更快,检测精度更高,能够更好地满足加拿大一枝黄花检测与防治应用的需求。展开更多
To investigate the potential role of allelopathy in plant interference and in the successful invasion of alien species Solidago canadensis, aqueous and ethanolic extracts from rhizomes, stems and leaves of S. canadens...To investigate the potential role of allelopathy in plant interference and in the successful invasion of alien species Solidago canadensis, aqueous and ethanolic extracts from rhizomes, stems and leaves of S. canadensis were prepared and used as treatment solutions to assess their effects on seed germination and seedling growth in four target species, mulberry （Morus alba）; morning glory （Pharbitis nil）, wheat （Triticum aestivum） and rape （Brassiea campestris）. Reduction and/or growth in germination and growth of the target plant species in the presence of both aqueous and ethanolic extracts at different concentrations indicated that the responses were species-specific and concentration-dependent. Generally, ethanolic extracts （especially from leaves） imposed stronger effects on both seed germination and seedling growth. Extracts with lower concentration at 0.001 g/ml dw could stimulate the seedling growth of rape and morning glory, whereas extracts at any given concentrations have inhibitory effects on wheat and mulberry. It is suggested that the aqueous and ethanolic extracts of all the three parts of S. canadensis have significant allelopathic effects. Although both inhibition and stimulation occurred in the germination and growth of the target species, extracts with higher concentrations definitely inhibit seed germination and seedling growth of all target plants. We suggest that allelopathy plays a more important role than other mechanisms do in the out-competition ofS. canadensis over other plants, and make it invasive in new habitats.展开更多
文摘为提高加拿大一枝黄花的治理效率,实现对其智能化监测,提出一种改进的YOLOv5(You Only Look Once)网络的检测方法。首先,在YOLOv5网络中添加通道注意力模块,在维持模型轻量化的基础上提高了目标检测精度。其次,在主干网络中添加SPD-Conv(Space-to-Depth Convolution)层,提高了网络对低分辨率图像以及小目标检测的效果。最后,采用自适应激活函数替换原网络的SiLU(Sigmoid Linear Unit)激活函数,在网络快速收敛的同时提高了网络的泛化能力。实验结果表明,改进的YOLOv5网络精度均值较原网络提高了5.8%,改进后的网络收敛速度更快,检测精度更高,能够更好地满足加拿大一枝黄花检测与防治应用的需求。
文摘To investigate the potential role of allelopathy in plant interference and in the successful invasion of alien species Solidago canadensis, aqueous and ethanolic extracts from rhizomes, stems and leaves of S. canadensis were prepared and used as treatment solutions to assess their effects on seed germination and seedling growth in four target species, mulberry （Morus alba）; morning glory （Pharbitis nil）, wheat （Triticum aestivum） and rape （Brassiea campestris）. Reduction and/or growth in germination and growth of the target plant species in the presence of both aqueous and ethanolic extracts at different concentrations indicated that the responses were species-specific and concentration-dependent. Generally, ethanolic extracts （especially from leaves） imposed stronger effects on both seed germination and seedling growth. Extracts with lower concentration at 0.001 g/ml dw could stimulate the seedling growth of rape and morning glory, whereas extracts at any given concentrations have inhibitory effects on wheat and mulberry. It is suggested that the aqueous and ethanolic extracts of all the three parts of S. canadensis have significant allelopathic effects. Although both inhibition and stimulation occurred in the germination and growth of the target species, extracts with higher concentrations definitely inhibit seed germination and seedling growth of all target plants. We suggest that allelopathy plays a more important role than other mechanisms do in the out-competition ofS. canadensis over other plants, and make it invasive in new habitats.
