洮河滩地柳树护岸林营造与防护效应

Protective Effect of Willow Forests along the Beach of the Taohe River

为减少洮河水流对河岸的冲刷和入黄泥沙量,在洮河滩地用5个柳树良种以4种密度配置营造护岸林,对其生长情况和防护效应进行观测。结果表明:J172柳的成活生长表现最好,3 a生平均树高为7.07 m,平均胸径为11.82 cm;最佳的护岸林密度是2 m×2 m和3 m×3 m;密度越大,阻拦的泥沙越厚,3 a生柳树最佳密度配置时阻拦泥沙平均厚1.36 m,可有效阻拦泥沙输入黄河。

5 varieties of willow were planted with 4 densities along the beach of the Taohe River,one of the tributaries of the Yellow River,to investigate the effects of diminishing the bank erosion and the amount of sediment into the Yellow River.The results showed that the willow variety J172 exhibited best behaviors in survival rate and growth.3-year old trees could reach a height of 7.07 m in average,and 11.82 in average breast height diameter.The most optimal densities for afforestation were 2 m×3 m and 3 m×3 m;The denser the density of the willow trees planted,the thicker of the sediment retained.The thickness of the sediment retained for 3 years trees could be 1.36m under the optimal densities,indicating that willow forests could effectively retain the sediment form the Taohe River into the Yellow River.