论文部分内容阅读
张家口地区位于我省西北部,全区分坝上、坝下两部分,坝上处于蒙古高原的前沿,属高寒草原地带;坝下山峦起伏地形复杂,大部属于深山沟谷地带。全区总土地面积5,540万亩,建国以来,根据土地利用原则,全区规划宜林面积为1,696.4万亩,占全区总面积的30.6%山荒宜林面积907.2万亩,占总面积40%,截止1979年底统计,全区已造林757.03万亩,其中荒山造林379万亩,过去造林是本着先易后难的原则,凡海拔低,立地条件好,土层深厚,交
The Zhangjiakou area is located in the northwestern part of our province. The whole area is divided into two parts: the upper part of the dam and the lower part of the dam. The dam is at the forefront of the Mongolian plateau and belongs to the alpine grassland zone. The undulating terrain of the dam under the dam is complex, most of which belong to the deep mountain valley. The total land area of 55,400 mu, since the founding of the country, according to the principle of land use, the region planned forest area of 16.964 million mu, accounting for 30.6% of the total area of the mountain desert forest area of 9.072 million mu, the total area of 40% As of the end of 1979 statistics, the region has afforested 7.5703 million mu, of which 379 acres of afforestation in the mountains, the past afforestation is based on the principle of easy first, where the low elevation, site conditions are good, deep soil, pay