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选择岩溶区3种不同的典型根系地下生境类型土壤作为研究对象(类型Ⅰ——白云岩水平产状多层空间类型、类型Ⅱ——白云岩倾斜产状多层空间类型及类型Ⅲ——白云岩直立产状多层空间类型),分析不同类型及层次对土壤微生物生物量的影响,以及土壤养分、土壤酶活性的变化。结果表明:(1)根系地下生境类型和层次对土壤微生物生物量的影响极显著(p<0.01);(2)3种类型的土壤微生物生物量差异极显著(p<0.01),均随土壤层次的下降而降低,类型Ⅰ的微生物环境较差,类型Ⅱ较好,类型Ⅲ居中;(3)类型Ⅰ在一定程度上能促进碳循环,类型Ⅱ利于有机碳的循环、氮的供应,类型Ⅲ利于磷的供应及有机物质的氧化。该研究可为探索岩溶地区的根系地下生境及其土壤条件,并为同等条件的土壤肥力评价、植被恢复技术研究提供参考。
Three typical underground habitat types of soils were selected as the study objects (Type I - horizontal dolomite-bearing multi-layered spatial type, type II - dolomite tilted-shaped multi-layered spatial type and type III - Baiyun Rock upright producing multi-layered space type), the effects of different types and levels on soil microbial biomass and the changes of soil nutrients and soil enzyme activities were analyzed. The results showed that: (1) The effect of underground root habitat types and layers on soil microbial biomass was significant (p <0.01); (2) The difference of soil microbial biomass among the three types was significant (p <0.01) Type Ⅰ microbial environment is poor, type Ⅱ is better, type Ⅲ center; (3) type Ⅰ can promote carbon cycle to some extent, type Ⅱ conducive to the cycling of organic carbon, nitrogen supply, type Ⅲ is conducive to the supply of phosphorus and organic matter oxidation. The study can be used to explore the underground habitats and soil conditions in karst areas and to provide reference for the research of soil fertility evaluation and vegetation restoration under the same conditions.