中文摘要：

互花米草是从美国引进我国的适宜在海滩高潮带下部至中潮带上部广阔滩面上生长的耐盐耐淹植物，研究互花米草盐沼湿地土壤腐殖质的空间分布规律是了解外来物种互花米草对我国潮滩环境影响的重要方面。本文选择了10个地点，采集了41个土壤样品并进行了腐殖质含量测定，分析了互花米草盐沼湿地土壤腐殖质各指标沿垂直于海堤方向以及平行于海堤方向和地下剖面方向的空间分布特征，探讨了产生空间异质性的可能原因。结果表明，互花米草盐沼湿地土壤属于典型的富里酸性、在稳定海岸沿垂直于海堤方向一般表现为从海岸向外逐渐降低的趋势以及从表层向下腐殖质含量呈波状降低，但降低幅度一般较小。

英文摘要：

The soil humus is the major part of the soil organic matter, and it is the major sign of the soil fertility. Spartina alterniflora loisel is an abextra species introduced into China from America which can occupy vast areas between mean sea level and mean high level. The soil humus affected by the salt-tolerant plants of the Spartina alterniflora has special character. Therefore, it is very important to study the spatial diversity of the soil humus in Spartina alterniflora loisel salt marsh. The paper collected 41 soil samples in 10 typical areas in Spartina alterniflora loisel salt marsh in Jiangsu province and Fujiang province, which include those collected from sea toward direction, parallel the sea wall direction and vertical direction, and the plants community character of the Spartina alterniflora loisel was investigated. Then the soil humus and the soil organic carbon contents were measured, and the spatial distributing characters of the soil humus and the possible reason were analyzed. The results show that the amount of the fulvic acids is more than that of the humic acids in Spartina cdterniflora loisel salt marsh, that the humus content near the sea wall usually are more than that of the sea toward site in steadily coast, and that the soil humus content reduces flexuously from surface layer to the bottom layer with small extent duo to the long root of the Spartina alterniflora loisel.