Soil Nutrient,Microorganism and Enzyme Activities under Different Artificial Sand-fixing Forests in the Sandy Area of Yulin

Soil nutrients,microorganism,and enzymes activities of 6 kinds of typical artificially sandland-fixing vegetation in the sand areas of Yulin were measured.The results showed that after artificial plantations were set up,soil nutrients,biology properties of artificial vegetation had been improved greatly,the enzyme activity was strengthened significantly.The soil nutrient,microorganism and enzyme activity were different in different vegetations.The soil nutrients and bacterium numbers and the soil urease activity under Hedysarum scoparium × H.mongolicum were 5.15 g·kg-1,21.75×105·g-1,and 1.48 μg·g-1respectively,higher than those in structure H.mongolicum.The number of actinomyces and fungi under Pinus sytvestris var.mongolica was the biggest,but soil organic matter and urease were low.The activity of soil alkaline phosphatase and catalase under Salix psammophila was higher than others,which were respectively 2.35 mg·g-1,14.10 mL·g-1.Close ralationship existed among soil microorganism quantity,enzyme activity and soil nutrient content,from which the content of soil organic matter was significantly correlated to soil bacterium quantity,alkaline urease,sucrace,phosphatase,catalase activity,and soil nutrient content.