水位高程变化对湿地土壤微生物代谢功能的影响研究——以蚌湖为例

发布时间：2018-04-20 09:49

  本文选题：鄱阳湖 + 水位高程　； 参考：《长江流域资源与环境》2017年05期

【摘要】：在淡水湖泊生态系统中,水位高程的变化会对整个生态系统产生重要的影响。本研究以鄱阳湖最具代表性的碟形湖——蚌湖为实验地点,研究了水位高程对于湖泊湿地土壤微生物代谢功能的影响。在实验中沿水位高程及植被带演替布设6个样地,利用Biolog-Eco技术探究不同水位高程样地土壤微生物群落代谢功能的多样性及分布规律。结果表明:随着样地水位高程的降低,土壤含水量逐渐升高,地表植被的覆盖率逐渐减少,土壤有机养分出现先减小后增大的趋势;而土壤微生物对碳源代谢活性随着高程的降低依次减弱,且优先利用的碳源种类和碳源利用率也有显著不同。通过dbRDA排序分析表明:土壤微生物群落功能多样性沿高程呈现区域性分布特征,相邻的两样地土壤微生物碳源代谢功能更为相近。影响湿地土壤微生物碳源代谢功能的主要因子为土壤含水量、土壤有机质含量、pH、NH_4-N和地表植被类型。本研究结果可为合理管理和保护鄱阳湖湿地生态系统提供科学的指导。
[Abstract]:In freshwater lake ecosystem, the change of water level will have an important effect on the whole ecosystem. In this study, the effect of water level elevation on the microbial metabolic function of lake wetland soil was studied by using the most representative saucer lake-clam lake in Poyang Lake as the experimental site. In the experiment, six plots were arranged along the elevation of water level and succession of vegetation belt, and the diversity and distribution of microbial community metabolic function of soil microbial communities in different water level plots were studied by Biolog-Eco technique. The results showed that with the decrease of water level, the soil water content increased, the vegetation coverage decreased, and the soil organic nutrients decreased first and then increased. However, the metabolic activity of soil microbes to carbon sources decreased with the decrease of elevation, and the types of carbon sources and the utilization efficiency of carbon sources were significantly different. The results of dbRDA sequencing showed that the functional diversity of soil microbial communities showed a regional distribution along the elevation, and the metabolic function of soil microbial carbon sources was more similar in the two adjacent plots. The main factors affecting soil microbial carbon source metabolism were soil moisture content, soil organic matter content, pH value of NH _ 4-N and vegetation types. The results of this study can provide scientific guidance for the rational management and protection of Poyang Lake wetland ecosystem.
【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】：S154.3
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本文编号：1777276