Gradient under water 海底坡度
In combination with the gravimetric method, one can obtain the adsorption amount of water and the thickness of adsorbed water layer on solid surface under various driving gradient pressures.
结合重量分析，用离心法可得到不同驱动压力梯度下的吸附水量及吸附水层厚度。
Under the same condition the effect of water content gradual drought stress to photosynthetic rate was weaker than that of gradient drought, which showed that the poplar could endure temporal drought.
在逐渐干旱过程中，水分利用率随着含水量的下降而上升，但长时间的严重干旱胁迫导致水分利用率降低；
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