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为了更好地理解在潮水和植被交互作用梯度上有机质、全氮和全磷分布的特殊性,分别于生长季和非生长季在苏北盐沼沿近潮沟带和远潮沟带2条样线布设9个固定采样区,采集土壤样品,测定土壤有机质、全氮和全磷的含量。结果表明:植被和潮水的交互作用是决定土壤有机质、全氮和全磷时空变化的关键因素。相对于潮水,植被的影响更为稳定和持久;盐沼土壤有机质和全氮含量具有显著的空间和月份变化,空间变化主要包括植被带(潮水)梯度上和样带间(潮流)的差异,在植被带(潮水)梯度上植被带高于光滩,而植被带间呈现由海向陆的递减趋势,即互花米草(Spartina alterniflora)>盐地碱蓬(Suaeda salsa)>獐茅(Aeluropus littoralis)>芦苇(Phragmites australis);有机质样带间差异表现为在低位盐沼远潮沟带大于近潮沟带,而中位盐沼却是近潮沟带大于远潮沟带,全磷含量时间和空间变化上均不具显著性;p H、土壤含水量和盐分含量等与潮水作用直接相关的因子与距海距离呈负相关关系,土壤有机质、全氮和全磷与距海距离也表现为负相关关系,而土壤有机质、全氮和全磷含量与p H、土壤含水量及盐分含量等因子为正相关关系,一定程度上诠释了潮水对土壤有机质、全氮和全磷含量变化的影响。
In order to better understand the particularity of distribution of organic matter, total nitrogen and total phosphorus in the interaction gradient of tidewater and vegetation, respectively, in the growing season and non-growing season, Nine fixed sampling areas were arranged on the sample line, and soil samples were collected to determine the content of soil organic matter, total nitrogen and total phosphorus. The results show that the interaction between vegetation and tide water is the key factor to determine the spatio-temporal variations of soil organic matter, total nitrogen and total phosphorus. Compared with the tidal flat, the impact of vegetation is more stable and lasting. The content of soil organic matter and total nitrogen in salinized soil has significant spatial and monthly changes. The spatial variation mainly includes the difference of vegetation gradient and tidal current, Vegetation belts were higher in the vegetation belt than in the light beach, and the vegetation belts showed a decreasing trend from sea to land, ie, Spartina alterniflora> Suaeda salsa> Aeluropus littoralis )> Phragmites australis. The difference between organic-zonal samples was that in the lower salt marsh, the tidal range was greater than that in the near-tidal zone, while in the middle-salt marsh, the tidal range was larger than that in the far-tidal zone. And spatial variation were not significant. The factors such as p H, soil moisture content and salt content, which were directly related to the tidewater effect, had a negative correlation with the distance to the sea. The contents of soil organic matter, total nitrogen and total phosphorus and the distance to the sea also showed Negatively correlated with the soil organic matter, total nitrogen and total phosphorus, and p H, soil water content and salt content of soil organic matter, to a certain extent, the impact of tide water on the changes of soil organic matter, total nitrogen and total phosphorus .