| 1. | Compared manual with spontaneous vegetation recovery process of blown sands , the pace is quicker , the degree is higher , the transformation range is larger of every physical and chemical characters 与风沙土人工植被恢复相比较自然植被恢复,土壤发育速度慢、强度低、程度弱,土壤质量较差,肥力水平很低。 |