Effects Of Organic Materials Treatment Strategies In Desertification Soil On Soil Carbon And Nitrogen And Microbial Activity

Ningxia is located in the Northwest inland patterns in china, It belongs to the temperate semi-arid continental climate. At present, the desertification land of Ningxia is 1.26×104 km2. It is 24.3% of total areas of Ningxia. Not only the living environment of the local residents is affected by desertification, but also desertification has become a bottleneck factor of economic and social sustainable development in Ningxia. Repairing desertification soil, therefore, promoting the ecological recovery in the region is of great significance. In this study, several common organic material and abdominal desertification soil in Ningxia were used as the research object, three different processing mode were set up. A, Adding the same mass fraction (5%) of 7 types of different organic additives in the soil. B, Adding different proportion (0%/CK,2%,5%,8%,11%) of the same kind of organic additives in the soi. C, Soil different treatments (crushing covered, branch covered, crushing added, added+branch covered). The soil water content, organic carbon and total nitrogen, microorganism quantity, enzyme activity and the change of the microbial carbon and nitrogen of desertification after 1 year were studied. The main results were as follows:1.Compared with the control, Besides the influence on the soil water content and pH was not significant (P>0.05), The different types of organic materials additives treatment were significantly(P <0.05) increased soil organic carbon, total nitrogen, the activity of soil enzyme(catalase, urease, cellulose), the quantity of microorganism (bacteria, fungi, actinomycete) and microbial biomass carbon and nitrogen of different depth (0～10 cm,10～20 cm) of soil, and each index content gradually increased with the increase of the depth, however, the effects varied with different organic materials additives treatment. The sequence of soil comprehensive evaluation index of different treatment is Locust tree branches crushing additive> Wheat straw crushing additive> Elm branch crushing additive> Rice husk additive> Grapes branch crushing additive> Poplar branches crushing additive> Organic fertilizer additive> CK.2.Compared with controls, Adding different proportion of the same kind of organic materials additive treatment were significantly (P< 0.05) increased soil water content, organic carbon, total nitrogen, the activity of soil enzyme (catalase, urease, cellulose), the quantity of microorganism (bacteria, fungi, actinomycete) and microbial biomass carbon and nitrogen of the different depth (0～10 cm,10～20 cm), and each index content gradually increased with the increase of the adding proportion, pH was not significant(P>0.05)between the groups, but overall a downward trend, each index content gradually increased with the increase of the depth. The sequence of soil comprehensive evaluation index of adding different proportions of the same organic material is 11% of Poplar branch crushing additive> 8% of Poplar branch crushing additive> 5% of Poplar branch crushing additive> 2% of Poplar branch crushing additive> CK.3.Compared with the control,5% of Poplar branch crushing added+Poplar branch covered and 5% of Poplar branch crushing added treatment were significantly increased soil organic carbon, total nitrogen, the activity of soil enzyme (catalase, urease, cellulose), the quantity of microorganism (bacteria, fungi, actinomycete), microbial biomass carbon and nitrogen (P<0.05), reduced the soil pH of the different depth (0～10cm,10～20cm); Poplar branch crushing covered and Poplar branch covered treatment can increase the soil water content, organic carbon, the activity of soil enzyme (catalase, urease, cellulose), microbial biomass carbon and pH, reduce the quantity of microorganism (bacteria, fungi, actinomycete) and microbial biomass nitrogen, but no significant differences (except Poplar branch crushing covered treatment significantly increased soil water content) (P>0.05), each index content gradually increased with the increase of the depth. The sequence of soil comprehensive evaluation index of different organic materials treatments is 5% of Poplar branch crushing added+ Poplar branch covered> 5% of Poplar branch crushing added> Poplar branch crushing covered> Poplar branch covered> CK.The results of research show that the general organic materials additives treatment can improve the different depth of soil water storage capacity, carbon and nitrogen content and microbial activity, However, The soil properties is influenced by the types, proportions and treatment of organic materials. Judging from the angle of microbiology can speculate the effects of use the Agroforestry organic waste materials obviously, we should strengthen the research in this field, which can be used as a reference to the theory of desertification soil ecological restoration in the future.