论文部分内容阅读
黄土丘陵沟壑区是我国农业发展战略研究重点地区之一,也是我国水土流失最严重地区。其生态失调造成的恶性循环,使本区自然环境恶化,土地生产力衰竭。本文拟从延安市附近土地类型研究入手,揭示黄土丘陵沟壑区土地类型结构格局、分布规律、阐明土地类型的自然特征、演替图式及改造利用措施,为合理利用土地资源、合理布局农林牧业生产,进行生产规划提供科学依据。
The loess hilly and gully areas are one of the key areas for the study of China’s agricultural development strategy and also the most serious areas for water and soil loss in China. The vicious cycle caused by its ecological disorders has deteriorated the natural environment and depleted the productivity of the land. This paper intends to start with the study of land types around Yan’an, reveal the pattern and distribution pattern of land types in the loess hilly and gully regions, and clarify the natural characteristics, succession patterns and transformation and utilization measures of land types. In order to make rational use of land resources, Industry production, production planning to provide a scientific basis.