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本试验在划分立地条件类型的基础上,开展了营造混交林的研究。结果表明:在祁连山营造乔灌混交林可使乔木保存率提高5～27.5％,树高生长量提高3～185％;适宜的混交比例为乔木2～3、灌木7～8;优质壮苗、水平沟整地、苗木栽植深度也影响造林效果;混交林可使土壤容重较纯林降低28.9％,贮水量增加17.3％;并用灰色关联分析理论对影响祁连山造林效果的立地因子进行了综合评价;用GM(1,1)建模理论对混交林树高生长过程进行了预测;对水热条件与林木生长的关系进行了探讨。
Based on the classification of site condition types, this study carried out the research of creating mixed forest. The results showed that the mixed plantation of Qiu Lian Mountain could improve the preservation rate of arbor and the height of tree height by 5 ~ 27.5% and 3 ~ 185% respectively. The suitable mixed proportion was 2 ~ 3 trees and 7 ~ 8 shrubs. The depth of seedling planting also affected the afforestation effect. The mixed forest could reduce the bulk density of soil by 28.9% and the water storage capacity by 17.3% compared with the pure forest. The gray correlation analysis theory was used to evaluate the site factors affecting the afforestation effect in Qilian Mountains. GM (1,1) modeling theory was used to predict the height growth of mixed forest. The relationship between hydrothermal conditions and forest growth was also discussed.