Abstract:

The aim was to provide a theoretical basis for the degradation of black oriented cultivation and technical support, and enrich the fertility theory. The enzyme activity variation of black soil in different farming conditions was studied through comparative analysis. The activity of hydrogen peroxide using potassium permanganate titration was detected by soil enzyme activity test method. The activity of urease was detected by indophenol blue colorimetry. The activity of sucrase was detected by 3,5-dinitrosalicylic acid method. The activity of phosphatase was detected by Lan-slope etc. The results showed that alkaline phosphatase activity and four constant (organic matter, total nitrogen, total phosphorus and available nitrogen) soil physical and chemical indicators were highly significant correlation. The alkaline phosphatase and acid phosphatase in soil phosphorus cycle played a significant role in the process, and impacted on soil available phosphorus and total phosphorus content. Phosphatase played a significant role in the process of the conversion of soil carbon, nitrogen, phosphorus. The level of alkaline phosphatase activity could be used as evaluation the most sensitive indicator of black soil fertility. Sucrase, urease and phosphatase were highly significantly related. The relationship among the soil enzyme activities, indicated that soil enzymes had obligate features, and also had common relationships. The special nature of the enzyme not only reflect the process of transformation of soil organic compounds, and the common relationship between the overall activity of the enzyme plays a big impact on the soil of the overall fertility level to a certain extent.