为了更直观科学地反映祁连山浅山区退耕地土壤和植被生态效益的变化,对祁连山浅山区山丹大黄山水土保持技术示范区退耕地土壤理化性质和植被覆盖度进行了测定和分析。结果表明:沙棘林地土壤水分和容重低于草地,土壤持水量和孔隙度则反之;土壤容重与土壤持水量、毛管孔隙度、总孔隙度呈显著负相关(P<0.05);沙棘林地土壤贮水量略高于草地,但差异性不显著(P>0.05);封育3年草地电导率、速效钾、速效磷和有机质等土壤养分含量高于沙棘林地和未封育草地,未封育草地土壤pH值和碱解氮含量高于其他地类,沙棘林地土壤全氮含量略高于其他地类;2017—2020年,示范区内植被覆盖度由69%提高到了78.8%,平均每年增加3.26%。

In order to more intuitively and scientifically reflect the changes of soil and vegetation ecological benefits of the abandoned farmland in the shallow mountainous area of Qilian Mountains,the soil physicochemical properties and vegetation coverage were measured and analyzed in Shandan Dahuangshan Demonstration Area of Soil and Water Conservation technology in the shallow Qilian Mountains.The results indicated that soil moisture and bulk density in seabuckthorn forest were lower than those in grassland,while soil moisture capacity and porosity were higher.Soil bulk density was significantly negatively correlated with soil water holding capacity,capillary porosity and total porosity (P<0.05).Soil water storage of seabuckthorn forest was slightly higher than that of grassland,but the difference was not significant (P>0.05).The contents of soil nutrients,such as electrical conductivity,available K,available phosphorus and organic matter,in the enclosed grassland were higher than those in the unclosed grassland and the seabuckthorn forest.The contents of pH and alkali-hydrolyzable nitrogen in the unclosed grassland were higher than those in the other land types,and the total nitrogen content in the seabuckthorn forest was slightly higher than that in the other land types.Between 2017 and 2020,the vegetation coverage in the demonstration area increased from 69% to 78.8%,with an average annual increase of 3.26%.