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草业学报  2014 

黄河口潮滩湿地土壤CH4氧化潜力及其对有机物输入的响应

DOI: 10.11686/cyxb20140113, PP. 104-112

Keywords: 黄河口,潮滩湿地,CH4氧化潜力,酵母膏,甲醇

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Abstract:

2010年11月,采集了黄河口北部滨岸高潮滩、中潮滩、低潮滩和光滩表层土壤样品,基于短期培养实验,研究了不同潮滩土壤CH4氧化潜力及其对有机物输入的响应。结果表明,尽管4种湿地土壤的CH4氧化潜力存在一定差异(P>0.05),但整体变化规律相似。12~60h,CH4氧化潜力均呈先增加后降低变化;60~132h,CH4氧化潜力均呈迅速增加趋势。4种湿地土壤CH4氧化潜力整体表现为光滩(2.37μg/g·d)>低潮滩(2.29μg/g·d)>中潮滩(1.70μg/g·d)>高潮滩(1.47μg/g·d)。甲醇输入整体抑制了湿地土壤的CH4氧化潜力,抑制程度表现为光滩>中潮滩>低潮滩>高潮滩。4种湿地土壤的CH4氧化潜力分别为1.27,0.49,0.67和0.38μg/(g·d),较对照组降低13.56%,70.98%,70.65%和83.83%;酵母膏输入对高潮滩、中潮滩和光滩土壤的CH4氧化潜力表现为促进作用,促进程度表现为中潮滩>高潮滩>光滩。3种湿地土壤的CH4氧化潜力分别为2.89,2.41和2.96μg/(g·d),较对照组增加69.38%,64.01%和24.76%。与之相比,酵母膏对低潮滩土壤的CH4氧化潜力表现为弱抑制作用,其氧化潜力为2.14μg/(g·d),较对照组降低6.67%。可见,不同有机物对潮滩湿地土壤CH4氧化潜力的影响差异较大,在当前外源有机物为黄河入海主要污染物情况下,潮滩湿地CH4的源/汇功能将会发生明显变化,这就使得在估算黄河口潮滩CH4排放清单时应特别关注不同有机物输入对CH4释放的影响。

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