延安地区土壤水分生态与植被建设

半干旱半湿润的延安黄土高原地区是我国水土流失严重和植被建设的重点地区之一,90年代以来以造林为主的植被建设效果并不理想。以果园地为研究重点的延安不同地区和不同立地条件下存在土壤水分状况的空间差异和普遍的土壤干化现象,土壤水分的总体亏缺是延安地区土壤干层出现的客观依据。延安地区土壤水分状况表明,延安南部和中部地区可以进行合理的人工造林,而北部地区应以灌草植被恢复为主,而地形破碎的梁峁地在造林过程中必需运用水平阶等集水造林技术。

Soil Moisture Ecology and Vegetation Construction in Yan'an

Yan'an is located in Loess Plateau,and one of the most serious soil erosion areas in our country,and also the key areas needing vegetation construction.But the results of afforestation since the 1990s was not unsatisfactory.The results showed that there were space differenced of soil moisture and general soil-drying phenomenon,regardless our determination come from orchard field which were planted meticulously.The facts showed that soil-drying layer came from objective bases.According the soil moisture state of areas of Yan'an,rational artificial afforestation in the south of Yan'an and middle part could carry on,and northern territory should rely mainly on the grass vegetation,and topography broken area must be made horizontal steps,and collect water in the course of afforesting.