依据吉林省前郭县地区复杂的立地类型及气候条件，提出了针对不同立地条件的造林技术，并对三北防护林体系建设工程困难立地造林项目效益做了初步分析。

The suitable temperature conditions on the seed germination and effects of temperature on substance transformation of Tilia amurensis Rupr. seeds during germination were discussed. Germination percentage and germination index was examined in 5 constant temperature and 4 alternating temperature. The effects of two temperature regimes on substance of Tilia amurensis Rupr. seeds during germination were discussed. Results showed that the optimum alternating and constant temperature regimes were 15℃/10℃ and 10℃ respectively under the darkness condition. When the temperature was over 20℃ , the germination percentages decreased. When the stratified seeds germinated over 25℃ , the amylase activity of seed were restrained, the decomposition of starch was slow, and the metabolism of soluble and sugar was restrained, thereby the seeds cold not germinate normally.