两种代表性蚯蚓对设施菜地土壤微生物群落结构及理化性质的影响

发布时间：2018-09-06 17:06

【摘要】：不同生态型蚯蚓的取食偏好和生境有所差异,因此蚯蚓的生态型差异可能关乎其对土壤性质的不同影响;有关不同生态型蚯蚓对土壤性质尤其是微生物学性质影响的研究有助于了解蚯蚓生态功能的作用机制。在野外调控试验的第4年采集土壤,研究了牛粪混施和表施处理下内层种威廉腔环蚓(Metaphire guillelmi)和表层种赤子爱胜蚓(Eisenia foetida)对设施菜地土壤微生物群落结构和主要理化性质的影响。结果表明,土壤微生物群落结构同时受到蚯蚓种类和牛粪施用方式的影响。牛粪表施时,两种蚯蚓均显著降低了菌根真菌、真菌生物量和原生动物生物量(P0.05);牛粪混施时,不同蚯蚓的影响有所差异,威廉腔环蚓明显增加了菌根真菌、真菌生物量和放线菌生物量,而赤子爱胜蚓的作用不明显。此外,两种蚯蚓均提高了土壤孔隙度、团聚体稳定性和土壤p H、矿质氮以及微生物生物量碳氮水平,但提高幅度取决于蚯蚓种类和牛粪施用方式。冗余分析表明蚯蚓影响下土壤微生物群落结构的变化与团聚体稳定性、p H、速效磷、矿质氮呈正相关,而与土壤容重呈负相关。
[Abstract]:The feeding preferences and habitats of different ecotypes of earthworms are different, so the ecotype differences of earthworms may be related to their different effects on soil properties. Studies on the effects of different ecotypes of earthworms on soil properties, especially microbiological properties, are helpful to understand the mechanism of the ecological function of earthworms. In the fourth year of field control experiment, the effects of mixed application of cow dung and surface application on soil microbial community structure and main physicochemical properties of the inner layer (Metaphire guillelmi) and the surface species Aisheng (Eisenia foetida) were studied. The results showed that the soil microbial community structure was affected by earthworm species and cow manure application. The two earthworms significantly decreased mycorrhizal fungi, fungal biomass and protozoa biomass (P0.05), and the effects of different earthworms were different when mixed with cow dung. The biomass of fungi and actinomycetes was not obvious, but the effect of Aisheng was not obvious. In addition, both earthworms increased soil porosity, aggregate stability, soil pH, mineral nitrogen and microbial biomass carbon and nitrogen levels, but the increase range depended on earthworm species and the application of cow dung. Redundancy analysis showed that the changes of soil microbial community structure under the influence of earthworms were positively correlated with the stability of aggregates, available phosphorus and mineral nitrogen, but negatively correlated with soil bulk density.
【作者单位】：南京农业大学资源与环境科学学院土壤生态实验室;江苏省有机固体废弃物资源化协同创新中心;
【基金】：国家自然科学基金项目(41171206) 公益性行业科研专项(201503121) 江苏省高校优势学科建设工程项目(PAPD)
【分类号】：S154.3;S626

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