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鄱阳湖湿地土壤酶及微生物生物量的剖面分布特征
于昊天,刘亚军,寇文伯,刘以珍,吴 兰,等
作者单位地址
于昊天 南昌大学生命科学学院 江西省,南昌市,红谷滩新区,学府大道999号,南昌大学(前湖校区),理科生命大楼a720
刘亚军 南昌大学生命科学学院 
寇文伯 南昌大学生命科学学院 
刘以珍 南昌大学生命科学学院 
吴 兰 南昌大学生命科学学院 江西省南昌市红谷滩新区学府大道999号(南昌大学前湖校区)理科生命大楼A724室
摘要:
本研究以鄱阳湖区内典型的苔草湿地土壤为研究对象,选择剖面深度为1m共5层(0~20cm,20~40cm,40~60cm,60~80cm,80~100cm),对土壤酶活性(β-葡萄糖苷酶、乙酰氨基葡萄糖苷酶、β-木糖苷酶、土壤磷酸酶、酚氧化酶、过氧化物酶)、微生物生物量(碳和氮)及土壤理化性质进行了研究。结果表明,代表微生物功能活性的土壤酶和微生物生物量均随着剖面深度的增加而逐渐降低,表层土壤(0~20cm)中的酶活性和微生物生物量均显著高于深层土壤。值得注意的是,不同土壤酶活性随着剖面深度的变化规律不一,但总体酶活性在土壤深度为60cm时达到稳定,且仍都具有较高活性;表层土壤微生物生物量碳为65.58~161.90 mg/kg,微生物生物量氮为7.39~16.28 mg/kg,占所研究剖面总含量的51%-69%。进一步的相关性分析发现土壤微生物功能特性与有机质、总有机碳、总氮、土壤含水量及pH存在显著的相关性,其中土壤有机碳和总氮是影响鄱阳湖湿地土壤微生物数量和活性的最主要因素。结果提示,土壤深度对湿地土壤微生物功能特性及土壤性质具有显著影响,表层土壤中微生物功能活性最高,但湿地深层土壤中仍存在大量的微生物,由微生物参与的代谢活动仍然活跃,深层土壤微生物功能特性不容忽视。
关键词:  天然湿地  剖面土壤  微生物生物量  土壤酶  微生物功能
DOI:
分类号:
基金项目:国家自然科学(31360127; 31260110)
Profile Distribution Characteristics of Soil Enzyme and Microbial Biomass in the Poyang Lake Wetland
YU Haotian,LIU Yajun,KOU Wenbo,LIU Yizhen,WU Lan,et al
Abstract:
In this study, the Poyang Lake wetland with typical Carex cinerascens community was selected as the research object. The profile soil depth is 1m, which is divided into five layers(0~20cm, 20~40cm, 40~60cm, 60~80cm, 80~100cm). The soil profile distribution of soil enzyme activities (β-glucosidase, acetylaminoglucosidase, β-xylanase, phosphatase, phenol oxidase and peroxidase), microbial biomass and soil physicochemical properties were determined. The results showed that the soil enzyme and microbial biomass, which represented microbial functional activities, decreased gradually as the soil depth increased. The soil enzyme activities and microbial biomass in surface soil (0~20cm) were significantly higher than those in deep soil. It should be noted that the profile distribution of different soil enzyme activities varied with increasing soil depth, but the overall enzyme activity was not only stable, but also relatively high at the soil depth of 60cm. Besides, microbial biomass carbon in the surface soil was 65.58~161.90 mg/kg, and microbial biomass nitrogen was 7.39~16.28 mg/kg, accounting for 51%-69% of the total content in soil profile. In addition, correlation analysis showed that soil microbial functional characteristics were significantly related to organic matter, total organic carbon, total nitrogen, soil water content and pH. Among them, soil organic carbon and total nitrogen were the most important factors affecting the soil microbial biomass and activity in the Poyang Lake wetland. These results indicated that soil depth had significant effects on both soil microbial functional characteristics and soil physicochemical properties. Our findings suggested that although the microbial activity in surface soil was highest, a large number of microorganism still exist in deep soil, and their metabolic activities are also active. Therefore, the microbial functional characteristics in deep soil remains to be explored in the future work.
Key words:  natural wetland  profile soil  microbial biomass  soil enzyme  microbial function