碳/氮比率可作为白榆新梢生根的指标。

C/N ratio can be taken as a rooting index of elm tip.

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新梢直立，绒毛无，节间浅绿色；

The shoot is erect without villus and the internode is light green.

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新梢生长呈快-慢-快-较慢的规律。

The shoot growth was a fast-slow-fast-slower rule.

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新梢叶片数以南京的为最高，昆明的最低。

As to leaf number of new shoot, Nanjing the most, Kunming the least.

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新梢开始生长含量较低。

At the new shoots growth, the nitrogen amount is lower.

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随着新梢生长减缓，白藜芦醇含量逐渐降低；

Then it declined with shoot growth being weaken.

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随着新梢生长减缓，白藜芦醇含量逐渐降低；

Then it declined with shoot growth being weaken.

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