盐城海滨湿地盐沼植被对土壤碳氮分布特征的影响

在盐城海滨湿地不同植被带下采集土壤样品，研究了土壤有机碳和全氮的空间分布特征，分析了盐沼植物对湿地土壤碳、氮分布的影响.结果表明：在盐城海滨湿地，表层土壤中有机碳和全氮含量分别介于1.71～7.92 g·kg^-1和0.17～0.36 g·kg^-1之间，变幅较大，不同植被带之间存在显著差异，且各植被带表层土壤中有机碳、全氮含量均高于光滩.垂直方向上，各植被带土壤中有机碳、全氮的分布均呈自表向下逐渐降低的趋势，15 cm以下其含量基本保持稳定.土壤有机碳与全氮、碳氮比呈显著正相关，但全氮与碳氮比无显著相关性.

Stock structure of skipJack tuna(Katsuwonus pelamis)from the log school by purse seine in the Western and Central Pacific Ocean.

Soil samples under different salt marsh vegetations in Yancheng coasta l wetland were collected, and their organic carbon (C) and total nitrogen (N) we re determined, aimed to analyze the influence of salt marsh vegetation on the sp atial distribution of soil carbon and nitrogen. The results showed that the orga nic C and total N contents in top soils varied from 171 to 792 g·kg-1 and from 017 to 036 g·kg-1, respectively, and there were significant differences among different vegetation zones. The top soils organic C and total N contents in vegetation zones were higher than those in mudflat without vegeta tion. In the soil profiles in vegetation zones, organic C and total N contents h ad a trend of decreasing with depth, but changed little below the depth of 15 cm . Soil organic C was significantly positively correlated with soil total N and C /N, but soil total N had no significant correlation with soil C/N.