可在原生木质部和初始后生木质部的管胞和导管中见到。
It is found in protoxylem and first metaxylem tracheids and vessels.
如用圆木杆，可削去顶端树皮，露出木质部的明亮色泽。
If timber poles are used, the bark can be peeled off the tops to expose the light colored sapwood.
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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