Tree rings are made of tissue called xylem.
构成年轮的组织被称为木质部。
Large proportion of xylem benefit to the water transfer.
叶脉中木质部比重越大，越有利于水分的传输。
The positive xylem pressure, often occurs with low transpiration rate, is termed as root pressure.
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.
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。
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