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采用垂直梯度观测与样地调查相结合的方法 ,对紫椴和水曲柳人工幼林最低温度变化、物候及霜冻程度进行了系统研究和分析 ,同时进行了防止紫椴晚霜冻田间试验 .结果表明 ,紫椴的物候较水曲柳晚 ;受逆温现象的影响 ,不同坡向和坡位的紫椴和水曲柳物候变化表现出特殊的规律性 ,西坡芽苞开放时间较东坡早 ,芽苞开放随坡位的上升而提前 ,并以坡上最早 ;晚霜的发生是早春季节降温过程与该阶段林木物候变化动态吻合的结果 ;通过立地选择可以有效地控制霜冻 ,该地区坡下特别是东坡的坡下不适合营造紫椴和水曲柳人工林 ;化学物质和生物遮荫可以推迟紫椴萌动 ,进而防止霜冻 ;混交林对防止霜冻具有明显效果 ,无论是霜冻指数还是各受害等级的株数比例均低于纯林 .
The method of combining vertical gradient observation and sample survey was used to systematically study and analyze the minimum temperature variation, phenological and frost degree of artificial young stands of Tilia amurensis and Fraxinus mandshurica, and the field experiments were conducted to prevent late frost of Tilia amurensis , Tilia amurensis later than the Ash; Lateral temperature phenomenon, the different slope and slope of Tilia amurensis and Phyllostachys phenotypic changes showed a special regularity, west slope buds open earlier than the east slope , Buds open with the rise of the slope position ahead of time, and the earliest slope; the occurrence of night frost is the result of the early spring season cooling process and the dynamic changes of the phenology of the tree phenology at this stage; site selection can effectively control the frost, the slope In particular, the slopes of Dongpo are not suitable for creating Tilia amurensis and Fraxinus mandshurica plantations; chemical substances and biological shading can delay the sprout of Tilia amurensis, thereby preventing frosts; and the mixed forest has a significant effect of preventing frost, whether it is the frost index or the The number of affected plants was lower than pure forest.