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茶树体内的水分状况,不但和土壤水分具有密切的能量联系,而且与大气中的水汽也产生能量联系,并形成在土壤——茶树——大气这一连续体中的水势下降梯度;在茶树体内导管中常承受着不同程度的负压,因此形成了根——茎——叶的水势下降梯度,从而促使水分能源源不断地从土壤进入根系,通过茎于运向枝叶,使蒸腾、呼吸、光合等一系列生理代谢活动能顺利进行。1964年,Scholander首先用压力室技术测定了多种植物木质部液流所承受的负压(即水势),对促进植物水分状况的研究起了很大作用。七十年代,坦桑尼亚(Carr,1971)、肯尼亚(Othieno,
Water conditions in the tea tree not only have close energy connection with soil moisture, but also produce energy connection with the water vapor in the atmosphere and form a gradient of water drop in the continuum of soil-tea tree-atmosphere. In the tea tree Catheter often bear different degrees of negative pressure, thus forming a root - stem - leaf water potential gradient, thus contributing to the water source of energy from the soil into the root system, through the branches in the operation of the leaves, so that transpiration, respiration, photosynthesis A series of physiological metabolic activities can be carried out smoothly. In 1964, Scholander first used pressure chamber technology to determine the negative pressure (ie, the water potential) on the xylem flow of various plants, which played a significant role in the study of plant water status. Seventies, Tanzania (Carr, 1971), Kenya (Othieno,