论文部分内容阅读
玉田县北部荒山,一般海拔在100至400米之间,成土母质为石灰岩,白云岩。从坡脚向上,多处岩石裸露,植被稀疏,是山区生态系统中的一个薄弱环节。搞好荒山绿化,扩大植物资源,对山区的开发治理,调整产业结构发展本县经济占有重要位置。 北部山区有山场86542亩,按土层划分,大体分为四种类型:①除地,主要为基岩裸露或碎石坡占16.6%;②薄层土,土层在25厘米以下的坡地和混有少量土壤的碎石坡地占68.1%;③中层土,土层在25—50厘米的坡地
Yutian County, northern barren hills, the general elevation of 100 to 400 meters, into the soil as the mother of limestone, dolomite. From the foot of the slope upwards, many rocks are exposed and the vegetation is sparse, which is a weak link in the mountainous ecosystem. Do a good job afforestation, expanding plant resources, the development and management of mountainous areas, adjust the industrial structure development of the county economy occupies an important position. There are 86542 mu of mountainous area in the northern mountainous area. According to the soil classification, it is divided into four types: (1) Except for the land, the bare or gravel slope mainly accounts for 16.6% of the bedrock; (2) Thin soil with slope below 25cm And mixed with a small amount of soil gravel slope accounted for 68.1%; ③ middle soil, soil in the 25-50 cm slope