论文部分内容阅读
植物体内的水分是由土壤—植物—大气循环的水流决定的,叶与根系之间的水势梯度是植物从土壤中吸取水分的动力,当土壤水势小于叶片水势时,植物便不能从土壤中获得水分。
The moisture in plant body is determined by the current of soil-plant-atmosphere circulation. The gradient of water potential between leaf and root is the power of plant to absorb water from soil. When soil water potential is less than leaf water potential, plant can not get from soil Moisture.