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对我国北方地区１０种树种一年生枝木质部栓塞程度及水势在不同季节的日变化情况进行了测定。结果表明，木本植物木质部栓塞化存在着日变化规律。３种针叶树木质部栓塞的日变化不明显，变化幅度较小。７种阔叶树种冬季清晨和傍晚时木质部栓塞程度大于上、下午，生长季节则为上、下午大于清晨和傍晚。生长季节水势的日变化趋势与木质部栓塞程度的日变化趋势相反，清晨和傍晚高于上、下午。并对木质部栓塞化在自然状态下的恢复状况作了一些讨论。
The decay degree of annual xylem in 10 species of tree species in northern China and the diurnal variation of water potential in different seasons were measured. The results showed that the xylem embolization of woody plants exist diurnal variation. The diurnal changes of three kinds of coniferous xylem emboli were not obvious, and the variation range was small. The species of xylem embolism in the seven broadleaf species were higher in the early morning and late afternoon in the morning and afternoon than in the early afternoon and late afternoon. The growing season was higher than the early morning and the late afternoon. The daily variation trend of water potential during the growing season was opposite to that of the xylem embolism. The morning and evening were higher than the morning and afternoon. And made some discussions on the restoration of xylem embolization in the natural state.