结果表明：乔木树种的水分利用效率远比草本和灌木树种低。
The results show that the water use efficiency of arbor is lower than one of herb and shrub.
毛竹群落内混交乔木树种的种类、数量和分布均匀程度对毛竹产量影响显著。
The variety, quantity and distribution of trees mixed in bamboo communities significantly impact the bamboo production.
在干旱瘠薄山地，灌木保持水土、涵养水源、改善生态环境等方面具有乔木树种不可代替的作用。
In the arid and poor mountain lands, shrubs are used to conserve soil, water and headwater and to improve ecological environment, which can not be replaced by any tree species.
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