论文部分内容阅读
商都县西井子乡地处我国旱作农业区北限,为农牧业交错的地带,属于正在发展中的沙漠化地区。由于气候条件恶劣,这里的农业生产经营粗放、产量低而不稳,植被建设又跟不上去,致使沙化日趋严重。1975年以来,西井子乡营造了农田防护林,对防止沙害和农作物增产起了显著作用。为了探讨幼龄林带的防护效益,为因地制宜地确定林带类型和树种配置提供依据,我们在西井子乡选择了具有代表性的林带,做了一
Xidi Township, Shangdu County is located in the northern limit of China’s dry farming area, which is a staggered belt of agriculture and animal husbandry, belonging to the developing desertification area. Due to the harsh climatic conditions, extensive agricultural production and management here, low and unstable output, and the construction of vegetation can not keep up, resulting in the increasingly serious desertification. Since 1975, Xijingzi Township has built farmland shelterbelts and played a significant role in preventing sand damage and increasing crop yields. In order to explore the protective benefit of young belt, to provide the basis for determining the type of forest belt and the configuration of tree species according to local conditions, we chose a representative belt in Xizi Zi, made a