Study On Root Vertical Distribution Of Three Kinds Of Shrubs In Mu Us Sandy Land

In this study, we took Caragana davazamcii, Salix psammophila and Artemisia ordosica as research objects, and use the method that dig the whole root of every plant to investigate the root vertical distribution of the three kinds of plant. Meanwhile, we combined with the chemical analysis of soil properties, then summarized the root vertical distribution characteristics of the three kinds of plant on different sandy land. The results are as follows:1. The root-shoot ratio of Caragana davazamcii, Salix psammophila and Artemisia ordosica are 0.99,0.54 and 0.46, respectively. So, the relationship of root-shoot ratio among them is Caragana davazamcii> Salix psammophila> Artemisia ordosica.If we distinguished the sandy land, the shoot ratio of Salix psammophila were 0.56 on semi-fixed sandy land,0.52 on shifting sandy land. The shoot ratio of Artemisia ordosica were 0.32 on fixed sandy land,0.53 on semi-fixed sandy land, 0.43 on shifting sandy land.2. The thick root occupy 89.57%,93.51% and 88.87% of underground biomass of Caragana davazamcii, Salix psammophila and Artemisia ordosica respectively. The fine root occupy 10.43%,6.49% and 11.13% of underground biomass respectively.Caragana davazamcii’s thick roots concentrated in the soil layer of 0-30 cm, accounting for 62% of total thick root, the largest biomass of thick root apperas in the soil layer of 0-10 cm, accounting for 23% of total thick root. Fine roots concentrated in the soil layer of 10-70 cm, accounting for 76% of total fine root, the largest biomass of fine root appears in the soil layer of 10-20 cm, accounting for 21% of total fine roots.Salix psammophila’s thick roots concentrated in the soil layer of 0-20 cm, accounting for 74% of total thick root, the largest biomass of thick root in the soil layer of 0-10 cm, accounting for 51%. Fine roots concentrated in the soil layer of 0-30 cm, accounting for 79% of total fine root, the largest biomass of fine root appears in the soil layer of 0-10 cm, accounting for 33% of total fine roots.Artemisia ordosica’s thick roots concentrated in the soil layer of 0-30 cm, accounting for 81% of total thick root, the largest biomass of thick root appears in the soil layer of 0-10 cm, accounting for 43%. Fine roots concentrated in the soil layer of 0-30 cm,accounting for 78% of all fine root, the largest distribution of fine root appears in the soil layer of 10-20 cm, accounting for 33% of all fine roots.3. On semi-fixed sandy land, Salix psammophila’s thick root occupies 93% of the underground biomass, fine root accounted for 6%. On the shifting sandy land, Salix psammophila’s thick root occupies 85% of the underground biomass, fine roots accounted for 15%. On fixed sandy land, Artemisia ordosica’s thick root occupies 85.55% of the underground biomass, fine root accounted for 14.45%; On Semi-fixed sandy type, Artemisia ordosica’s thick root occupies 86.05% of the underground biomass, fine root accounted for 13.95%; On the shifting sandy sand, Artemisia ordosica’s thick root occupies 84.95% of the underground biomass, fine roots accounted for 15.05%.