在植物弱蒸腾情况下，木质部的水分处于正压状态，这种压力叫根压。

The positive xylem pressure, often occurs with low transpiration rate, is termed as root pressure.

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构成年轮的组织被称为木质部。

Tree rings are made of tissue called xylem.

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叶脉中木质部比重越大，越有利于水分的传输。

Large proportion of xylem benefit to the water transfer.

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根的次生木质部导管大。

The secondary structure of root has large vessel diameter.

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根的次生木质部导管大。

The secondary structure of root has large vessel diameter.

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