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采用垂直梯度观测与样地调查相结合的方法．对水由柳人工幼林最低温度变化、物候及受霜害的程度进行了系统研究和分析。结果表明．研究地也区受地形的影响存在着明显的逆温现象．不同坡位最低温度的温差最大达10.0℃．最小为0.6℃。水曲柳物候变化表现出特殊的规律性、西坡水曲柳芽苞开放时间较东坡提前1～2d；混交林较纯林提前3～4d；坡上芽苞开放最早．较坡中平均提前1～2d，比坡下提前5～6d。西坡水由柳受霜害程度明显低于东坡；坡上水曲柳受霜害程度最低．其次为坡中、坡下受害最重。混交林对防止霜害具有明显效果．无论是霜害指数还是各冻害等级的株数比例均低于纯林。
The method of combining vertical gradient observation and sample survey is adopted. The minimum temperature of the young plantations by Liu artificial water, phenology and frost damage degree were systematically studied and analyzed. The results show. The study area also affected by the terrain has obvious phenomenon of inversion. The temperature difference between the lowest slope temperature is up to 10.0 ℃. The minimum is 0.6 ℃. Phyllanthus alternifolius showed a special regularity. The opening time of buds in the west slope was 1-2 days earlier than that of the east slope. The mixed forest was 3 ~ 4 days earlier than the pure forest. Compared with the average slope earlier 1 ~ 2d, 5 ~ 6d ahead of the slope. The degree of frost damage on the west slope was significantly lower than that on the east slope, and the degree of frost damage on the slope was the lowest. Followed by the slope, the heaviest victims of the slope. Mixed forest to prevent frost damage has a significant effect. The frost damage index or the freezing stage of the number of strains were lower than the proportion of pure forest.