Effects of ridge-fertilization mode on soil physicochemical properties and enzyme activity of degraded alpine meadow
[Objective]In order to obtain a rapid soil restoration model for the extremely degraded alpine meadow.[Method]a typical extremely degraded alpine meadow in Luqu County,Gannan Tibetan Autonomous Prefecture was elected as the test site. Different soil preparation measures,fertilization treatments and then,mixed sowing of 70％ Elymus nutans+30％ Oat (Avena sativa) were carried out on this meadow. Analysis of its effects on soil properties of extremely degraded alpine meadows was made.[Result]The results showed that:1) The soil organic matter,alkaline hydrolyzed nitrogen,available phosphorus content and alkaline phosphatase activity in the 0～20 cm soil layer in the ridged plot were higher than those in the flat land . And the contents of phosphorus,alkali-hydrolyzed nitrogen,available phosphorus and sucrase activity in the 20～30 cm soil layer in the ridged plot were higher than those of the flat field. 2) Comparing the fertilization modes,the total phosphorus content in nitrogen fer-tilizer,microbial inoculum and nitrogen fertilizer+microbial inoculant treatment in 0～10 cm soil layer in the ridged plots,were lower than those with no fertilization treatment. In the 0～10 cm and 20～30 cm soil layers of flat plots,the contents of total phosphorus,total potassium,alkali-hydrolyzed nitrogen,available phosphorus and the activities of alkaline phosphatase and sucrase in soil treated with nitrogen fertilizer and microbial microbial agent were higher than those treated with nitrogen fertilizer or microbial microbial agent alone. 3) Under the interaction of soil prepara-tion and fertilization mode,the total phosphorus content in 0～10 cm and 20～30 cm soil layers and the content of alkali-hydrolyzed nitrogen and organic matter in 10～20 cm soil layers increased significantly.[Conclusion]Ridging mode has more advantages than flat land in optimizing soil organic matter,total phosphorus,alkali-hydrolyzed nitro-gen,available phosphorus and alkaline phosphatase activity. The complementary technology of ridging and nitrogen fertilizer+microbial agent can rapidly increase the content of organic matter,total phosphorus,alkali-hydrolyzed ni-trogen and alkaline phosphatase activity.
万方数据
维普
