嫩江沙地人工防风固沙林立地质量变化研究

Study on the Dynamic Change of Site Quality of Plantation for Wind Protection and Sand Fixation in Nenjiang Sandy District

对嫩江沙地不同发育阶段的小黑杨人工防风固沙林土壤水分、土壤理化性质进行了测定与分析。结果表明:随着种植年限的增长,小黑杨人工防风固沙林土壤的立地质量发生了很大的变化,土壤容重降低,孔隙度增加,土壤的持水能力和土壤肥力都有所提高,土壤理化性质均得到不同程度的改善。随着人工防风固沙林的建立,土壤水分呈下降的趋势,成为嫩江沙地植被恢复和人工固沙林群落稳定发展的一个重要的限制因子。

The soil water and the physical and chemical properties of soil were studied. The results showed that： with increase in age, the site quality of plantation for wind protection and sand fixation was changed obviously, bulk density decreased, soil porosity increased, soil water holding capacity improved and soil fertility enhanced, the physical and chemical characteristics of soil were improved to some extent. With the planting of plantation for wind protection and sand fixation, the trend of soil water decreasing became the limiting factors for vegetation renewal and rebuilding and the stability of plantation for wind protection and sand fixation.