【摘要】 该文在将宁夏段黄河护岸林防护林体系划分为 5种类型的基础上 ,分析了该地区防护林的体系分布、树种配置、生长状况及防护结构指标 .研究表明 ,该地区防护林建设应适当减小株行距 ,避免害虫特别是天牛易感树种的单一配置 .更多还原

【Abstract】 Based on the five types of the construction systems of the Yellow River that are portioned according to the distribution region, position and function of the protection forest in Ningxia Autonomous Region, the distribution of the system, the arrangement of tree species, the growth status and protection structure index are analyzed. The results indicate that the space of the plants should be reduced and the single arrangement of the susceptible species should be discarded.更多还原