当有多个细胞连在一起时，如果一端的细胞水势较高，另一端水势较低，顺次下降，就形成一个水势梯度(Water potential gradient)，水分便从水势高的流向水势低的。植物器官之间水分流动方向就是依据这个规律。
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初始含水率的不同，对水势梯度变化幅度具有明显影响。
The initial water content can evidently influence the amplitude of this change of its hydraulic gradient.
受水势梯度的影响，犁沟内非饱和水可以侧向补给相邻畦埂的土壤。
Affected by hydraulic potential gradient, the unsaturated soil water in the furrow soil may supply laterally the ridge soil of adjacent furrow.
水势反映土壤水的能态，而水势梯度则是决定水流方向和速度的重要因素。
Water potential reflects energy level of soil water and the gradient of water potential is an impotent factor describing direction and velocity of water flow.
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