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以不同林木枝条为试材,研究了土壤20cm深度添加长2cm的杨树枝条粉碎材料(A)、土壤添加杨树枝条粉碎材料的基础上同时土表覆盖40cm厚的去除叶片的柳树枝条(AB)、土壤表层覆盖3cm厚的长4cm的混合枝条粉碎材料(M)和不做任何处理的对照(CK),对宁夏沙化草地土壤微生物学特性和土壤理化性质的短期影响。结果表明:林木枝条不同处理方式较CK均不同程度的提高了土壤微生物(细菌、放线菌和真菌)的数量、土壤微生物碳、氮含量和土壤酶(过氧化氢酶、脲酶)活性,增加了土壤中有机碳氮含量、水分含量和土壤水稳性团聚体的比例,同时降低了土壤pH值;总体而言,林木枝条处理对提高土壤微生物活性和改善土壤理化性质的效果依次为AB>A>M>CK;表征土壤微生物特性指标和土壤理化性质的指标间存在显著(P<0.05)或者极显著相关(P<0.01)的关系,同时还符合线性关系(P<0.05);利用林木枝条不同处理方式均为微生物提供了有机能源,改善了土壤环境,促进了微生物对林木枝条的分解和转化,提高了土壤养分含量,同时改善了土壤的结构,可以作为未来沙化草地改良的一种措施。
Different tree branches were used as experimental materials to study the effects of adding poplar branches (A) with a length of 2 cm at the depth of 20 cm. The soil was covered with 40 cm-thick poplar branches (AB ), The soil surface covered with 3cm thick 4cm mixed shoots crushed material (M) and no treatment CK (CK), the short-term effects on soil microbiological characteristics and soil physical and chemical properties of sandy grassland in Ningxia. The results showed that the amount of soil microorganisms (bacteria, actinomycetes and fungi), soil microbial biomass C and N and soil enzymes (catalase, urease) activity were increased by different treatments of forest tree branches compared with CK Soil organic carbon and nitrogen content, water content and soil water-stable aggregates, while reducing soil pH; Overall, the effect of forest tree branches to improve soil microbial activity and improve soil physical and chemical properties of the order of AB> A> M> CK. There was a significant (P <0.05) or very significant (P <0.01) correlation between soil microbial properties and soil physico-chemical properties as well as a linear relationship The different treatments of branches provide organic energy for microorganisms, improve the soil environment, promote the decomposition and transformation of forest tree branches by microorganisms, increase the nutrient content of the soil, and improve the structure of the soil at the same time, which can be used as a kind of improved desert grassland in the future Measures.