影响海岸带盐沼土壤有机质、TN和TP含量时空变化的关键因子:潮水和植被

发布时间：2018-08-23 11:32

【摘要】：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。
[Abstract]:In order to better understand the particularity of the distribution of organic matter, total nitrogen and total phosphorus on the gradient of tidal water and vegetation interaction, nine fixed sampling areas were arranged in the salt marshes of northern Jiangsu Province along the near tidal trench zone and the far tidal trench zone in the growing season and non-growing season, respectively. Soil samples were collected and the contents of organic matter, total nitrogen and total phosphorus were determined. The results showed that the interaction between vegetation and tidal water was the key factor to determine the temporal and spatial changes of soil organic matter, total nitrogen and total phosphorus. Compared with tidal water, the effect of vegetation is more stable and lasting, and the content of organic matter and total nitrogen in salt marsh soil has significant spatial and monthly variations. The spatial variation mainly includes the difference of vegetation zone (tidal) gradient and transect (tidal current). On the gradient of the vegetation zone (tidal water), the vegetation zone is higher than that of the smooth beach, and there is a decreasing trend from the sea to the land between the vegetation zones. In other words, the difference of organic matter in (Phragmites australis); of (Aeluropus littoralis) Reed of (Suaeda salsa) roe (Aeluropus littoralis) in (Spartina alterniflora) salt soil of Spartina alterniflora shows that the far tidal trench zone is larger than the near tide trench zone in the low salt marsh, while the middle salt marsh is larger than the far tide trench zone in the middle salt marsh. The temporal and spatial changes of total phosphorus content were not significant, soil water content and salt content were negatively related to tidal action, and soil organic matter was negatively related to distance from sea to sea. Total nitrogen and total phosphorus also showed negative correlation with distance from sea, but soil organic matter, total nitrogen and phosphorus content were positively correlated with pH, soil water content and salt content, which explained the tidal water to soil organic matter to some extent. Effects of total nitrogen and total phosphorus content.
【作者单位】：江苏师范大学城市与环境学院;
【基金】：国家自然科学基金面上项目(41271122);国家自然科学基金青年项目(31100361)资助~~
【分类号】：S153.6

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