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为适应六盘山水源林可持续经营实践的需求,利用六盘山林业局120个森林连续清查固定样地调查资料,分析了林分郁闭度对林下灌木、草本植物生长影响的规律,建立了适用于当地的数学模型,提出了该区水源林林分的目标层次结构。结果表明:1)该区水源林林分郁闭度影响林下植被的生长,林下灌木层、草本层盖度随林分郁闭度升高而降低;2)该林区水源林林分郁闭度保持在0.5～0.8之间时能够形成明显的乔灌草层次结构,有利于实现水源林经营的生态功能和经济功能的协调;3)该区水源林林分的目标层次结构为,林分郁闭度0.5～0.8,灌木层盖度35%～46%,草本层盖度35%～46%。研究结果可为该区水源林结构调整提供依据。
In order to meet the needs of sustainable management of water source forests in Liupan Mountains, the data of 120 plots of Liupan Mountains Forestry Bureau were used to continuously survey the fixed sample plots. The influence of canopy density on the growth of understory shrubs and herbaceous plants was analyzed. Applies to the local mathematical model and proposes the target hierarchy of water source forest in this area. The results showed as follows: 1) The canopy density of water source forest in this area affected the growth of understory vegetation. The coverage of shrub layer and herb layer decreased with the increase of canopy density. 2) When the canopy density is kept between 0.5 and 0.8, it can form a clear hierarchical structure of trees, shrubs and weeds, which is conducive to the coordination of the ecological functions and economic functions of the water source forests. 3) The target structure of the water source forests in this area is: Forest stand density 0.5 ~ 0.8, shrub layer cover 35% ~ 46%, herb cover 35% ~ 46%. The results can provide the basis for the structural adjustment of water source forests in this area.