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我国早在建国初期就开始有计划地发展农田防护林,其林带结构与方位多以宽行并与主害风方向垂直的设计方案为主。自70年代以后,逐渐发展窄林带小网格的农田防护林网模式。据初步统计,目前全国已有1/5的耕地实现了此种类型的农田林网。但至今对农田林网与主害风向方位(即林网与风偏角的关系)关系的认识还不统一,为此,我们于1984年5月至7月在安徽省宿县新河乡黄淮海平原综合防护林体系试验示范区,通过野外模型实验和理论推导,对窄林带小网格的农田防护林网的透风度,方位与防风效应进行了较深入的探讨,为黄淮海平原综合防护林体系的建设提供规划设计的理论依据。
As early as the founding of our country, China began to plan the development of farmland shelterbelt in a planned way. The design of shelterbelt with its vertical structure and orientation is mainly vertical and wide. Since the 1970s, there has been a gradual development of a farmland shelterbelts model with narrow grids and small grids. According to preliminary statistics, at present, about one-fifth of the cultivated land nationwide has realized this type of farmland forest network. However, so far, the understanding of the relationship between farmland forest network and the direction of the main wind direction (that is, the relationship between forest network and wind declination) is not uniform. Therefore, from May 1984 to July 1984, Through the field experiment and theoretical derivation, the permeability, azimuth and windbreak effect of farmland shelterbelt in the narrow grid with small grids are discussed in depth, which is the comprehensive protection forest system in the Huang-Huai-Hai Plain Construction provides the theoretical basis for planning and design.