Vetiver grass (</span><i><span style="font-family:Verdana;">Vetiveria</span></i> <i><span style="font-family:Verdana;">zizanioides</span></i>&l...Vetiver grass (</span><i><span style="font-family:Verdana;">Vetiveria</span></i> <i><span style="font-family:Verdana;">zizanioides</span></i><span style="font-family:Verdana;"> L.) is widely used for soil and water conservation, and land management. In practice, all vetiver seedlings are propagated via ramets or tillers, which cannot meet the market demand and would also destroy the original habitat. Most</span><span style="color:red;"> </span><span style="font-family:Verdana;">vetiver genotypes flower but do not produce seeds. A wild ecotype of vetiver grass originated in southern China is fertile, but the rate of seed germination is very low. This study aimed to develop a novel method to improve its seed germination and seedling establishment. In the field, the inflorescences of wild vetiver were wrapped using a transparent plastic bag with a pot containing wet soils. The effects of inflorescence bagging and Tween 80 application on seed germination and seedling growth were examined. The results showed that seed development was characterized by low seed setting rate (19.2%), uneven maturity time, easy shedding (more than 95% of spikelets shed off 20 days after flowering), therefore difficult harvest of viable seeds. Bagging the inflorescence with moist soils in pot ensured the mature seeds falling onto the nursery soil surface and absorbing water for germination while the immature seeds continued to grow on the inflorescence. Bigging not only improved seed development and maturity, saved the procedure of seed collection and storage, but also provided a humid micro-environment for seed germination and seedling growth. Tween 80 as a surfactant promoted seed water absorption, germination and seedling growth. This simple and novel method has integrated the procedures of seed collection, storage, germination and seedling establishment, and enables </span></span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">produc</span><span style="font-family:Verdana;">tion</span><span style="font-family:""> </span><span style="font-family:Verdana;">of </span><span style="font-family:Verdana;">a large </span><span style="font-family:Verdana;">number</span><span style="font-family:Verdana;"> of healthy seedlings. The possible reasons for the degeneration and disappearance of the original population were also discussed from the perspective of the disadvantages of vetiver propagation.展开更多
In the all-media era,in order to adapt to the transmission of different channels,the requirements for meteorological information have become increasingly high,and the display format has also undergone a huge change.To...In the all-media era,in order to adapt to the transmission of different channels,the requirements for meteorological information have become increasingly high,and the display format has also undergone a huge change.To expand the effect of communication,create public opinion and hot spots,popularize meteorological knowledge,and spread meteorological disaster prevention and mitigation knowledge,it is necessary to transform original meteorological information into video pictures or recently popular short videos,small moving pictures,etc.Transforming meteorological information into graphics,video,dynamic graphics,micro-video,etc.is collectively called the visualization process of meteorological information.Therefore,meteorological information visualization is extremely urgent,and the natural visual communication production advantages of meteorological film and television will play a huge role.In this paper,some methods of visualizing meteorological information,expanding the spread of visualized meteorological information,and enhancing the transmission rate were proposed.展开更多
文摘Vetiver grass (</span><i><span style="font-family:Verdana;">Vetiveria</span></i> <i><span style="font-family:Verdana;">zizanioides</span></i><span style="font-family:Verdana;"> L.) is widely used for soil and water conservation, and land management. In practice, all vetiver seedlings are propagated via ramets or tillers, which cannot meet the market demand and would also destroy the original habitat. Most</span><span style="color:red;"> </span><span style="font-family:Verdana;">vetiver genotypes flower but do not produce seeds. A wild ecotype of vetiver grass originated in southern China is fertile, but the rate of seed germination is very low. This study aimed to develop a novel method to improve its seed germination and seedling establishment. In the field, the inflorescences of wild vetiver were wrapped using a transparent plastic bag with a pot containing wet soils. The effects of inflorescence bagging and Tween 80 application on seed germination and seedling growth were examined. The results showed that seed development was characterized by low seed setting rate (19.2%), uneven maturity time, easy shedding (more than 95% of spikelets shed off 20 days after flowering), therefore difficult harvest of viable seeds. Bagging the inflorescence with moist soils in pot ensured the mature seeds falling onto the nursery soil surface and absorbing water for germination while the immature seeds continued to grow on the inflorescence. Bigging not only improved seed development and maturity, saved the procedure of seed collection and storage, but also provided a humid micro-environment for seed germination and seedling growth. Tween 80 as a surfactant promoted seed water absorption, germination and seedling growth. This simple and novel method has integrated the procedures of seed collection, storage, germination and seedling establishment, and enables </span></span><span style="font-family:Verdana;">the </span><span style="font-family:Verdana;">produc</span><span style="font-family:Verdana;">tion</span><span style="font-family:""> </span><span style="font-family:Verdana;">of </span><span style="font-family:Verdana;">a large </span><span style="font-family:Verdana;">number</span><span style="font-family:Verdana;"> of healthy seedlings. The possible reasons for the degeneration and disappearance of the original population were also discussed from the perspective of the disadvantages of vetiver propagation.
文摘In the all-media era,in order to adapt to the transmission of different channels,the requirements for meteorological information have become increasingly high,and the display format has also undergone a huge change.To expand the effect of communication,create public opinion and hot spots,popularize meteorological knowledge,and spread meteorological disaster prevention and mitigation knowledge,it is necessary to transform original meteorological information into video pictures or recently popular short videos,small moving pictures,etc.Transforming meteorological information into graphics,video,dynamic graphics,micro-video,etc.is collectively called the visualization process of meteorological information.Therefore,meteorological information visualization is extremely urgent,and the natural visual communication production advantages of meteorological film and television will play a huge role.In this paper,some methods of visualizing meteorological information,expanding the spread of visualized meteorological information,and enhancing the transmission rate were proposed.
