经过野外调查发现，完成施工但尚未投入运营的青藏铁路沿线出现了一些次生不良冻土现象。

A number of secondary harmful frozen soil phenomena were found along Qinghai—Tibet railway which are being developed since the completion of construction of the railway.

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结果表明，青藏铁路沿线9个测站局地气温系统是明显的非线性系统，其演变周期大致在3～6年之间，气温振幅随时间增加而衰减。

The results indicate that the local-air systems at 9 stations along Qinghai-Xizang Railway are obvious nonlinear systems, and their inherent periods are form 3 to 6 years.

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结果表明，青藏铁路沿线9个测站局地气温系统是明显的非线性系统，其演变周期大致在3～6年之间，气温振幅随时间增加而衰减。

The results indicate that the local-air systems at 9 stations along Qinghai-Xizang Railway are obvious nonlinear systems, and their inherent periods are form 3 to 6 years.

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