关于黄土丘陵典型地区植被建设中有关问题的研究Ⅰ、土壤水分状况及植被建设区划

根据植被调查和土壤水分调查资料 ,讨论了黄土丘陵典型地区的造林的水分条件和植被地带的划分。水分不足是造林的限制因子 ,在现有天然林及人工林中普遍存在土壤干层 ,所以 ,延安研究区南部应属干旱森林区 ,北部属森林草原区。并根据土壤水分现状和植被现状 ,进行了植被建设区划 ,其划分两个一级区和两个二级区

The vegetation reconstruction and the regionalization of the vegetation district in the Yan an experimental region,according to the investigating data of vegetation and soil moisture.The moisture insufficient is limiting factors of growing forests.The soil arid layer is existing commonly in natural and artificial forests.Consequently,the southern part in Yan an experimental region belong to arid forest prairie and the northern part belong to forest steppe prairie.The regionalization of vegetation reconst...