Experiment Of Plant Water Transport Micro-Nano Construction Driving Force And The Theory Analysis Of Water Transport Model In Plant

At present, Micro- Nanochips either have a low efficient fluidic driving method or have a big driving device, which can not achieve"lab-on-a-chip"imagine. On another hand, plant has high water transport efficiency and its shape similarly as Micro- Nanochip's channels. So that it could imitate plant water transport driving force to make a new driving theory for Micro- Nanochips.However, the long water transport theory of plant is a problem to the plant physiology and zoology research, resulting in many controversies. Therefore, the thesis plotted designing experiments which separate the plant to find out the resources of the driving in plant water transport. Use Ligustrum vicaryi, Salix babylonica, Sophura japonica cv. pendula branches joining to capillary to compare driving capability of laminas and xylem. The result illustrated that the xylem of plant existed driving resource, very strength, which is fourth larger than laminas, compared to the laminas transpiration. In addition, the function of xylem is not capillarity in simple capillary. The main function of the laminas in water transport is a place for water to dissipate.In addition, we use Ligustrum vicaryi tress which loses water to carry on the water transport experiment in xylem, its results present that cell activity is one of xylem water transport condition, and xylem construction is propitious to transport direction from down to up.By adopt cellophane paper to simulate cell membrane's function; we investigate the effect of osmotic pressure in water transport. It finds out when transpiration velocity is low, the osmotic pressure could finish plant water transport, yet need six vessels parataxis composed of cambium of xylem at least. When transpiration velocity is high, osmotic pressure could not complete water transport of plant.Via analyze fluidic physics and chemistry property and vessel construction, we find that capillary could drive 59cm high water column, and osmotic pressure is produced by photosynthesis and respiration, to adjust cell water transport. The research establishes one dimension uncompress viscidity laminar flow movement model of vessel, and get relationship expression of vessel radius, pressure grads and each vessel node's length.Therefore, In order to afford theory for"lab-on-a-chip"in Micro- Nanochips, the thesis suggested that it could analyze of the different contact angle between xylem construction and water molecule, plus xylem materials property which would show the reason of water transport in plant.