鄱阳湖湿地土壤酶及微生物生物量的剖面分布特征

发布时间：2018-05-14 05:22

本文选题：天然湿地 + 剖面土壤　；参考：《环境科学研究》2017年11期

【摘要】：为探明淡水沼泽湿地土壤微生物功能活性随土壤剖面深度的变化,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1 m共5层(0~20、20~40、40~60、60~80、80~100 cm)的土壤,对土壤酶[Bglu(β-葡萄糖苷酶)、NAG(乙酰氨基葡萄糖苷酶)、Bxyl(β-木糖苷酶)、Phos(酸性磷酸酶)、Phox(酚氧化酶)、Pero(过氧化物酶)]活性、w(MBC)(微生物生物量碳含量)和w(MBN)(微生物生物量氮含量)及土壤理化性质进行研究.结果表明,代表微生物功能活性的土壤酶和w(MBC)、w(MBN)均随着剖面深度的增加而逐渐降低,表层(0~20 cm)土壤中的酶活性和w(MBC)、w(MBN)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40~60 cm时达到稳定,并且仍都具有较高活性;表层土壤中w(MBC)为65.58~161.90 mg/kg,w(MBN)为7.39~16.28 mg/kg,二者占所研究剖面土壤总微生物碳氮含量的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AFDM(去灰分干重)、w(TOC)、w(TN)、含水量及pH存在显著的相关性,其中土壤w(TOC)、w(TN)是影响鄱阳湖湿地土壤微生物数量和活性的最主要因素.研究显示,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.
[Abstract]:In order to find out the variation of soil microbial functional activity with the depth of soil profile in freshwater swamp wetland, the typical moss wetland soil in Poyang Lake region was chosen as the research object. The soil with a depth of 1 m was selected as the soil with a depth of 1 m and a total of 5 layers (0. 020, 20, 20, 40, 60, 60, 60, 80, 80, 100 cm). Studies on the activities of soil enzyme Bglun (尾 -glucosidase) NAG (acetylglucosaminidase) Bxyl( 尾 -xylosidase) PhosPhos( Phenol Oxidase Peroc (Perox) and WMBN (microbial Biomass nitrogen content) and soil Physical and chemical properties of soil were studied. The results showed that both soil enzyme and WMBN), which represented the functional activities of microorganism, decreased with the increase of the depth of the profile, and the enzyme activity in the topsoil (0 ~ 20 cm) and the activity of WMBN in the surface soil were significantly higher than those in the deep soil. It is worth noting that different soil enzyme activities vary with the depth of the profile, but the total enzyme activity is stable when the depth of soil is 4060 cm, and all of them still have high activity. In the surface soil, the value of MBC was 65.58 ~ 161.90 mg 路kg ~ (-1) 路kg ~ (-1) ~ (-1) = 7.39 ~ 16.28 mg 路kg ~ (-1) 路kg ~ (-1), which accounted for 51 ~ (69) mg / kg of the total microbial carbon and nitrogen content of soil in the profile studied. Further correlation analysis showed that the functional characteristics of soil microbes were significantly correlated with organic matter (AFDM), water content and pH value, and the soil water content and pH were the most important factors affecting soil microbial quantity and activity in Poyang Lake wetland. The results show that the depth of soil has a significant effect on the functional characteristics and soil properties of soil microbes in wetland, and the functional activity of microorganism in surface soil is the highest, but a large number of microorganisms still exist in deep soil of wetland. Metabolic activities involving microorganisms are still active, and the functional characteristics of microbes in deep soil should not be ignored.
【作者单位】：南昌大学生命科学学院;鄱阳湖环境与资源利用教育部重点实验室;
【基金】：国家自然科学基金项目(31360127,31260110)
【分类号】：S154

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