Phosphorus Speciation Characteristics of Typical Artificial Vegetation Rhizosphere Soil in Mu Us Sandy Land

Understanding the phosphorus (P) forms in the rhizosphere and bulk soils of typical artificial vegetation can provide a basis for scientific vegetation construction in the area. The rhizosphere soil and bulk soil of seven typical artificial vegetations (Pinus sylvestris, Populus simonii, Amygdalus pedunculata, Amorpha fruticosa, Salix psammophila, Sabina vulgaris, and Artemisia ordosica) in Mu Us Sandy Land were collected and the phosphorus content of different forms were subsequently determined using Jiang-Gu phosphorus fractionation method.

The results showed that 1) The total phosphorus (TP) content of Salix psammophila rhizosphere soil was significantly higher than that of other vegetation types while Populus simonii, Amygdalus pedunculata, and Artemisia ordosica increased available phosphorus (AP) content in rhizosphere soil. This indicates that planting Populus simonii and the other 3 vegetation types was beneficial for P activation. 2) The Ca8-P content in rhizosphere soil of Pinus sylvestris, Amygdalus pedunculata, Amorpha fruticosa, and Salix psammophila was lower than in the bulk soil.