Effects of Gobi afforestation on soil physicochemical properties in the in Alxa League region
Soil physicochemical properties are an important basis for evaluating soil productivity,and an important factor restricting ecosystem succession in arid areas.According to the average annual precipitation of Alxa League from 1980 to 2017,the physical and chemical properties of the surface and profile soils Haloxylon ammodendron plantation forests of different forest ages in the 0-150 mm precipitation area of Gobi were compared and analyzed.The results showed that:(1)In the area of 0-50 mm precipitation area,the original Gobi surface was destroyed in the early stage of Haloxylon ammodendron plantation,and gradually approached the bare surface in the later stage,and in the area of 50-100 mm precipitation,the fine particle components of the surface decreased,and the coarse particle components increased,and the soil surface components coarsened after the planting of Haloxylon ammoden-dron.(2)The content of total nitrogen(TN)was 0.041-0.099 g.kg-1,the content of total phosphorus(TP)was 0.23-0.26 g.kg-1,the content of available phosphorus(AP)was 2.91-4.90 mg.kg-1,the content of total potas-sium(TK)was 18.61-19.61 g.kg-1,and the content of available potassium(AK)was 62.88-106.21 mg.kg-1.Nutrient content was low,and the soil was barren.The contents of each nutrient had surface aggregation,but there was no significant difference in the TK content of each soil layer.(3)In the area of 0-50 mm precipitation,the con-tents of TK and AK increased with the increase of forest age,the contents of AP and TN decreased,and the content of TP changed litter.However,the contents of TK and AP increased with the increase of forest age in the area of 50-100 mm precipitation,while the other nutrients decreased.
万方数据
维普
