Soil microorganism and enzyme activities under different artificial sand-fixing vegetations in the sandy area of Yulin

【Objective】 The study explored the biological property of the sand-fixing vegetation soil in order to provide reference for seeking reasonable and feasible management measures of sandy forest.【Method】 Take the wind-drift sand as the comparison,the soil bacteria,antinomies,fungus and catalase,sucrase,alkaline phosphatase,urease activities of 6 kinds of typical artificial sand-fixing vegetations in 0―5,5―20,20―40 cm soil layers in the sandland areas of Yulin were studied,and the soil microorganism quantities and the enzyme activities relevance were analyzed.【Result】 The result indicated that the number of soil microorganisms and the enzyme activities varied in different forest lands.The bacteria under Hedysarum scoparium×Hedysarum mongolicum numbered most in 0―5 cm soil layer.The soil antinomie and fungus numbers under Pinus sytvestris var.mongolica and Hippop haerhamnoides were the highest in 0―20 cm soil layer.In the 0―5 cm soil layer,the activity of soil alkaline phosphatase under Hedysarum scoparium×Hedysarum mongolicum and soil catalase of Salix psammophila,soil urease of Ponulus hopeiensis was bigger than those of others.Soil enzymatic activities decreased with soil depth.The correlations were significant between the quantities of soil bacterium,antinomies and the activities of catalase,sucrase,alkaline phosphatase.【Conclusion】 After artificial plantations were established,the soil microorganism quantities were increased greatly,the enzyme activities were strengthened significantly,and the soil biological properties were improved obviously.