不同空气流速对温室厚皮甜瓜容器苗性状的影响

Effects of Air Current at Different Speeds on the Characters of Container-growing Seedling of Muskmelon

为了明确增加温室空气流速来培育厚皮甜瓜壮苗的实际效果和适宜的空气流速,以不补风(V0)为对照,比较了空气流速分别为0.1m/s(V1)、0.5m/s(V2)和0.9m/s(V3)的机械补风处理对"伊丽莎白"厚皮甜瓜容器苗一些性状的影响。结果表明:补风处理后,茎粗、叶片厚度、全株干质量、子叶的叶绿素b含量增加,株高减小,其中后4个指标随着空气流速的增加变化越明显;与V0处理相比,V2和V3处理后,壮苗指数明显增大,其中V3处理后,根冠比明显增大,但真叶光合速率和叶绿素含量下降,而V2处理后,真叶数、根粗度增加,真叶光合速率和叶绿素含量上升。可见,增加空气流速明显提高了厚皮甜瓜容器苗质量,其中,0.5m/s的空气流速适宜在生产上使用。

In order to determine the practical effects of increasing the speed of air current inside greenhouse on the production of healthy seedlings of muskmelon and the optimal air current speed, some characters of container-growing seedlings of muskmelon ＂Elizabeth＂ were investigated after being treated by the forced air current induced by mechanical ventilation at the speed of 0.1 rn/s （V1）, 0.5 m/s （V2） and 0.9 m/s （V3）, while no ventilation treatment （V0）was taken as control. Results showed that after treatment, compared with control, it was observed that stem diameter, leaf thickness, total dry mass, and chlorophyll b content in cotyledon increased, and seedling height decreased significantly. The latter four indexes of the seedling characters varied more remarkably with the air current speed increasing. A significant increase in healthy index was found after being treated by V2, V3, compared with control. V3 increased the root/shoot ratio, while reducing the net photosynthetic rate and chlorophyll content in leaf. However, V2 increased the net photosynthetic rate and chlorophyll content in leaf as well as the leaf number and root diameter. Therefore, it is possible that production of healthy muskmelon seedlings by increasing the speed of air current. The air current speed at 0.5m/s is suggested to being used for practical production.