采用土钻法和盆栽试验研究了渭北地区主要造林树种的垂直根系分布特征及其抗旱性。

Methods of soil auger and pot experiment were used to research vertical root distributions and drought resistance of main planting tree species in the Weibei loess plateau.

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根据近年来国外林木根系模型研究现状综述了垂直根型，水平根型，复合根型和具有一般性的根系动态模型。

The dynamic models of upright root, level root, compound root and general root are summarized according to foreign study actuality of forest root system model.

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直根垂直，稍微加厚，分枝。

Taproot vertical, slightly thickened, branched.

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Let's look at 2py, which is vertical.

我们看看2py，垂直向上的那根。

麻省理工公开课 - 固态化学导论课程节选