黄土高原土壤干层初步研究

在详细描述土壤干层现象和类型的基础上 ,分析了土壤干层的成因 ,即低降水高蒸发、水土流失、植被类型选择失当、群落生产力过高和群落密度过大等 ,指出土壤干层的危害主要表现为使局部小气候环境趋于旱化、土地退化、植被生长衰退、天然下种更新不良及加大造林难度等 ,最后提出了缓解土壤干层对黄土高原生态环境的恢复和重建的意义和重要性。

The primary research on dried soil layer in the Loess Plateau

In this paper,on the basis of describing the phenomena and style of dried soil layer,the causes of formation of dried soil layer are analyzed,which are low precipitation and high transpiration,loss of soil and water,inappropriate to choose vegetation styles,exorbitant productivity of community,and too high community density.Meanwhile,the hazards of dried soil layer are put forward,which leads to microclimate environment to drought,soil degradation,declining of vegetation growth,bad natural sowing,and difficult afforestation and so on.Finally the significance for recovering and reconstruction of eco environment on the Loess Plateau of solving the problem of dried soil layer is suggested.