长江流域资源与环境 >> 2017, Vol. 26 >> Issue (05): 730-737.doi: 10.11870/cjlyzyyhj201705010
李金前1,2, 王吉1, 刘亚军1,2, 邹锋1,2, 马燕天1,2, 吴兰1,2
LI Jin-qian1,2, WANG Ji1, LIU Ya-jun1,2, ZOU Feng1,2, MA Yan-tian1,2, WU Lan1,2
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、NH4-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。
中图分类号:
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