封山育林对杂谷脑河干旱河谷区植被恢复的影响

Effect of Closed Forest on Vegetation Restoration in Arid Valleys of the Zagunao River

本文通过对干旱河谷封山育林区域与未封山育林区造林苗木生长状况和灌草群落特征对比,开展封山育林对干旱河谷区植被恢复成效研究。研究结果表明：在相同坡向和海拔梯度上,封山育林区造林苗木平均保存率和树高净生长量均极显著性高于未封山育林区,其差值变化幅度分别为21%（阴坡Ⅰ）-31%（阴坡Ⅲ）和42.7%（阳坡Ⅰ）-59.7%（阳坡Ⅱ）;灌草平均盖度和高也表现为封山育林区高于未封山育林区,灌木和草本平均盖度差值变化幅度1.1%（阳坡Ⅰ）-26.7%（阳坡Ⅱ）和2.2%（阳坡Ⅰ）-18.5%（阳坡Ⅱ）之间;灌木和草本平均高度差值变化幅度8.2%（阳坡Ⅰ）-53.5%（阴坡Ⅲ）之间和17.9%（阴坡Ⅲ）-28.9%（阴坡Ⅱ）之间。

Based on the contrast between afforestation seedling growth and shrub community characteristics in arid valleys of closed forest area and the non-closed forest area,researches were conducted on the effect of closing forest on arid vegetation restoration. The results showed that on the same slope and elevation gradient,the afforestation seedlings survival rate and average tree growth in closed forest area were significantly higher than those in non-closed forest area,the difference between the change extent was respectively 21%（ North SlopeⅠ） - 31%（ North Slope III） and 42. 7%（ South Slope Ⅰ） to 59. 7%（South SlopeⅡ）; the shrub coverage and height in the closed forest area were higher than those in non closed forest forest. The difference between average coverage range of shrub and herb was 1. 1%（ South SlopeⅠ） - 26. 7%（South SlopeⅡ） and 2. 2%（South SlopeⅠ） - 18. 5%（South SlopeⅡ） between shrubs and herb; the difference of average height was between 8. 2%（（ South Slope Ⅰ） - 53. 5%（North Slope III）） and 17. 9%（North Slope III） - 28. 9%（North SlopeⅡ）.