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为了探讨互花米草入侵对长江河口湿地土壤理化性质的影响,在长江口崇明东滩湿地设置了两条样线,利用配对试验设计,高潮滩为互花米草和芦苇群落配对样线,低潮滩为互花米草和海三棱藨草群落配对样线。结果表明,互花米草入侵对东滩湿地高潮滩和低潮滩的土壤温度和p H均无显著影响,且所有群落土壤p H值均在8.0以上。在高潮滩,与芦苇群落相比,互花米草入侵显著降低了土壤盐度、硫酸盐和Fe(III)/Fe(II)比率,而在低潮滩,与海三棱藨草群落相比,互花米草入侵对土壤盐度和硫酸盐无显著影响,但显著增加了土壤Fe(III)/Fe(II)比率。无论是高潮滩,还是低潮滩,与土著植物群落相比,互花米草入侵均显著增加了植物生物量,增加了土壤有机碳和微生物碳含量,而对占土壤总碳60%以上的无机碳含量无显著影响。互花米草入侵可以显著影响长江河口湿地部分土壤理化性质,且对不同潮位的部分土壤理化性质的影响有明显分异,进而可能会对长江河口湿地的生物地球化学过程及生态系统的结构和功能产生重要影响。
In order to investigate the influence of Spartina alterniflora invasion on the physical and chemical properties of the Yangtze River estuary wetland, two sample lines were set up in the Chongming Dongtan wetland of the Yangtze River estuary. Using the paired experimental design, the high tide beach was paired with Spartina alterniflora and Phragmites australis communities, Low tide beach for the Spartina alterniflora and the sea Pairs of grassland matching sample line. The results showed that Spartina alterniflora invasion had no significant effect on the soil temperature and p H of the high and low tidal flats in the Dongtan wetland, and all the soil p H values in the community were above 8.0. Compared with Phragmites australis communities, the invasion of Spartina alterniflora significantly decreased soil salinity, sulfate and Fe (III) / Fe (II) ratio at the high tide beach, whereas in the low tide beach, Spartina alterniflora invasion had no significant effect on soil salinity and sulfate, but significantly increased the soil Fe (III) / Fe (II) ratio. Compared with indigenous plant communities, Spartina alterniflora invasion significantly increased plant biomass and increased soil organic carbon and microbial carbon content, both in high tide beach and low tide beach. However, in the case of more than 60% of total soil carbon Carbon content had no significant effect. Spartina alterniflora invasion can significantly affect the physical and chemical properties of part of the Yangtze River estuary wetland soil physical and chemical properties, and the impact of some tide levels of soil physical and chemical properties are significantly different, and may be on the Yangtze River estuary wetland biogeochemical processes and ecosystem structure and Function has a significant impact.