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在人工改造低产林或幼林抚育时,需要连续二、三年带状或块状割除灌木,为幼苗幼树的生长创造更好的光、热、水、肥条件。但是,什么时期割灌才能最有效的抑制灌木生长,以降低抚育投资,提高造林成活率和保存率。为此,1982年至1984年我们做了割灌时间的选优试验,以探索割灌的最佳时间,现将试验情况介绍如下。一、试验区概况试验地设在榆中县马卸山林场翻车沟的灌木林内。该县属大陆性干旱草原气候区。试验地的海拔高度为2300—2400米,坡度15—25度,淋溶褐色土壤。灌木盖度80—90％。主要种
In the artificial transformation of low-yielding or young forest tending, the need for two or three consecutive years strip or block shrubs, seedling saplings for the growth to create better light, heat, water and fertilizer conditions. However, when cutting irrigation is the most effective way to reduce the growth of shrubs, to reduce the investment and improve the survival rate and preservation rate. Therefore, from 1982 to 1984, we conducted the optimization test of cutting irrigation time in order to explore the best time for cutting irrigation. The experimental conditions are as follows. First, the experimental area profile Experimental site located in Yuzhong County Ma’anshan forest dumper ditch shrubs. The county is a continental arid steppe climate zone. The experimental altitude of 2300-2400 meters, 15-25 degrees slope, leaching brown soil. Shrub cover 80-90%. The main species