The gradual drying of the soil caused by its diminished ability to absorb water results in the further loss of vegetation, so that a cycle of progressive surface deterioration is established.
土壤吸收水分的能力减弱使土壤逐渐变得干燥，导致植被进一步减少，从而建立了一个渐进的地表退化循环。
2
It is a indubitable fact that the deterioration of soil environment in loess plateau is caused by the long — standing destruction of vegetation and the serious erosion of soil and water.
由于长期的植被破坏和严重的水土流失黄土高原土壤环境的恶化是无容置疑的事实。
3
Excessive firewood consumption caused the vegetation system deterioration, the unbalance of species in each oasis system, appearing as various differences in the residents' firewood structure.