河流对河岸带落水区土壤线虫生态指数的影响

Journal of Hydroecology(2013)

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Abstract
选取辽河干流中下游鞍山-盘锦段为研究区域,通过对5个采样点的分析,以河岸之外未受流域影响的区域为对照,探讨河岸带落水区土壤线虫生态指数的变化。结果表明,由于受流域影响,在河岸带落水区,土壤线虫c-p(colonizer-persister)值显著低于对照区域。c-p1至c-p3的线虫占全部线虫比例的90%左右。各采样点落水区c-p1和c-p2线虫比例均高于对照区(P<0.05)。食真菌与食细菌线虫比例指数F/B(Fungivores to baterivores ratio)整体小于对照区域,表明河岸带落水区土壤食微线虫食物网更倾向于食细菌通道,线虫通路比值NCR分析(Nematode channel ratio)也说明了这种变化趋势。落水区线虫瓦斯乐斯卡指数WI(Micro-to plant-feeding nema-todes ratio)整体小于对照区域。河岸带落水区土壤线虫香农-威纳多样性指数H'(Shannon-Weiner diversity)、线虫均匀度指数J(Evenness)以及线虫丰富度指数SR(Richness)均整体小于对照区域,线虫优势度指数λ(Domi-nance)大于对照区域。土壤线虫生态指数可以作为评价河岸带土壤健康程度的重要依据。
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Key words
soil nematode,falling zone in the riparian,ecological index
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