Two forest specialists showed significant increase in densities, one is native and the other is exotic species.

This paper was based on the investigation of landscape trees in various green land to carry out the directories of landscape trees, common and potential use species and native species in Taiyuan city, and analyzed their growth and ornamental characteristics and use in landscape, and concluded the blooming time of main trees for flower view.

Through study of re-reclamation afforestation on mining district of Daye iron mine in Huangshi city, the authors found that the afforestation species suitable to re-reclamation of mining district are Vetch leaf Spphora, Hankow Willow, Chinese Arborvitae and Fortune Firethorn with additional of such auxiliary measures as pulling trough and digging pit and adding filler etc.

To meet the needs of afforestation in particular natural conditions in Yuanmou dry and hot valley, the quantitative selection research of drought resistant and heat resistant afforestation species was carried out.

The dissertation chose the main afforestation tree species Patycladus orientalis, Larixprinapiam-rupprech.

Characteristics of seedlings water consumption by transpiration of main afforestation tree species in north China.;

The frozen snow damage of main afforestation tree species in southeastern and southwestern Hubei from February to March in 2008 was investigated with a sampling method in typical plots,that was set up 20 m×20 m square.

According to the ecological environments and soil,and topography conditions of gully districts of yellow earth hills in Henan Province,this paper approached the principles of tree choice in vegetation recovery and reconstruction on this region as well as the distribution(disposition)models for afforestation tree species and main trees in different site type regions.