Using the theory of SPAC and the method of control experiment, the biology and growth behavor of young trees of the main afforestation tree species under different water conditons were studied.

• 基于水分因子是反映黄土高原不同造林立地类型宜林性，以及影响林木生长的主导环境因子这一观点，运用SPAC理论，通过控制试验，研究主要造林树种幼树在不同水分梯度下的生理及外观反应。