【摘要】 在京津风沙源工程区流动沙地采取不同的恢复和治理措施,7 a后,沙化土地理化性质的变异规律不同。①林地和草地由于植物枯枝落叶和根系的作用,土壤剖面颜色加深,部分地段出现了土壤结皮。②生态垫治理流动沙地可起到立竿见影的作用,但也阻断了沙地景观生态系统正常的生态过程,其土壤机械组成和养分含量基本没有变化。③主要受各种恢复和治理措施实施后所形成的植被近地表防风阻沙效益的影响,改善沙化土地机械组成和养分含量以灌木林最佳,封育后形成的天然草地次之,以乔木林最差。更多还原

【Abstract】 Different desertification control and rehabilitation countermeasures of the source area of the sand and dust endangering Beijing-Tianjin was taken on the shifting sandy land.Seven years later,the variation regularity of soil physical and chemical properties is different.The first variation is that soil profile color of forestland and grassland becomes deeper because of the effects of the forest litter and the roots system,and soil crusts appear in some areas.The second is that using ecological mat to control mobile sand dune can achieve outstanding effects,and the results showed that the normal ecological process were also blocked by the mat in the ecosystem of sandy landscape,and soil mechanical composition and soil nutrients kept constant during the study period.The third is that the vegetation formed after taking control and rehabilitation countermeasures have created great benefits from the wind prevention and sand resistance on the earth surface.For improving mechanical composition of sandy land and nutrients,the shrub forests are the most effective and the non-grazed grassland is the next,and the arbor forests is the least effective.更多还原