Abstract:

Based on the survey for 6 sample artificial Robinia pseudoacacia forestland sites and the analysis of soil water content and bole growth ring, the relationship of growing status(about height, DBH and volume and soil water deficit was studied. The results showed that the deficit degree of soil water was related to the growth status of Robinia pseudoacacia. In Yijun County, southern Shannxi, there is no severe soil water deficit, no obvious soil desiccation, the Robinia pseudoacacia growth was good. In Fu County, dried soil layer has been formed because of soil desiccation that already has had bad effects on the growth of Robinia pseudoacacia. In Wuqi, Ansai, Suide and Mizhi County, soil water deficit become severer, dried soil layer was worse, which caused artificial Robinia pseudoacacia plantation to form into low efficient and productive one and limited the ecological functions of artificial Robinia pseudoacacia plantation suggesting that those areas were not suitable for the growth of artificial Robinia pseudoacacia plantation.

Key words: Loess Plateau, Artificial Robinia pseudoacacia plantation, Soil desiccation, Water deficit, Growth of plantation