洞庭湖湿地防浪林三角形树团造林模式力学分析

Mechanical analysis on forestation model of triangle tree-groups in wavebreak forest in the Dongting Lake wetlands

以洞庭湖湿地三角形树团造林模式营建的川三蕊柳防浪林为研究对象,以传统造林模式为对照,研究扦插苗偏离机制。结果表明:受力点距树苗基部距离、拉力大小、造林模式三者对扦插苗偏离角度均存在显著影响(P<0.001)。随着受力点的升高,川三蕊柳扦插苗偏离角度明显增大;在近树苗基部受力(10 cm),拉力大小及造林模式对扦插苗偏离角度不存在影响,而在距树苗基部较高处受力(30 cm与60 cm),三角形树团造林模式可导致扦插苗偏离角度明显减小。

Taking shelterbelt of Salix triandroides by triangle tree-group as objects and by conventional model as control in the Dongting Lake wetlands, deflected process of cuttings seedlings were studied. The results showed that, the distance from pull point to seedlings base, pull force and forestation models had significant effects on the deflected angles. Deflec- ted angles increased with the increasing distance from pull point to seedling bases. In the lower place of seedlings （ 10 cm）, deflected angles did not differ among 3 forestation models and 2 pull forces. However, in the higher places （30 cm, 60 cm）, defected angels was lower in triangle tree-group than in conventional forestation model.