关键词: 紫椴, 光, 树冠结构, 幼树

Abstract: All biological energy sources are come from soils. Even such so-called fossil energy sources as coal and oil are also come from fossil soils.In our country, the main problem about energy sources is the fuel for daily use of peasants.It is necessary to work out a comprehensive plan for farmland construction including the establishment of fuel basis, and the popularization of using marsh gas.

Key words: Tilia amurensis, Light, Crown architecture, Saplings