柳树新品种等水源涵养林造林效果分析

Analysis about Afforestation Effect on Water Resource Conservation Forest of a New Type of Willow Tree

在临夏县大夏河水系支流的源头地带,用柳树进行不同方式、不同品种和不同密度营造水源涵养林试验。结果表明:植苗造林的成活和生长都明显好于压条造林;苏柳系的J172柳平均生长量最高,生长第3年平均树高达到3.67 m,明显高于对照,经方差分析,差异显著;采用3.0 m×3.0 m和2.0 m×2.0 m密度栽植的比较理想,采用1.5 m×2.0 m密度栽植的生长到3年后应适当进行间伐。

In view of the test on water resource conservation forest, with willow trees planted in different ways, species and densities, at the source of a branch of Daxia River system, Linxia Town, the results that showed the sur- vival and growth rates of plant seedling were higher of layering on willow trees. The average increment of J172 （So/- and was obviously higher than the control groups. Based on analysis of variance, there is a remarkable difference. The afforestation effect is better in 3.0 m×3.0 m and 2.0 m×2.0 m planting density. It will be proper to cut intermedi- ately at 1.5 m ×2.0 m planting density in 3 years.