中文摘要：

为了解阔叶林土壤有机碳及其组分的空间分布规律,采用线样法调查阔叶林土壤有机碳及其组分在土壤剖面层次、坡位和坡向的空间分布状况。结果表明,温带阔叶林土壤总有机碳量、粗颗粒有机碳和细颗粒有机碳含量存在明显剖面垂直特征,均表现出随剖面深度增加而含量逐渐减少的趋势。总有机碳含量随坡位（海拔）升高而增加,而颗粒有机碳含量随坡位（海拔）升高而降低。土壤粗颗粒组分在剖面结构中以0-5cm层和母质层分布比例较高,剖面中间层次分布较低。海拔升高,有利于母质层细颗粒组分积累。0-5cm表层土壤的粗颗粒比例显著高于细颗粒,二者间的差异随着土壤剖面深度的加深而逐渐减小。东、西坡向对土壤总有机碳、粗颗粒有机碳和细颗粒有机碳分布无明显影响。矿物结合态有机碳在剖面层次间的分布受坡向影响。西坡土壤矿物结合态有机碳剖面垂直分异性与颗粒有机碳相似,但东坡矿物结合态有机碳分布无剖面层次递度和海拔递度分异性。

英文摘要：

In order to know the spatial distribution patterns of organic carbon and size fraction of soil in temperate broad-leaved forest,the experiment investigated soil organic carbon and particulate organic carbon of soil profiles on slope position and slope direction in temperate broad-leaved forest.The results showed that there were similar vertical distribution patterns among total organic carbon,coarse particles organic carbon and fine particles organic carbon in soil profiles which reduced with the soil deepening.The total soil organic carbon content increased with the increasing elevation,while the soil particulate organic carbon decreased with the increasing elevation.The coarse particulate component of soil had high distribution proportions in 0-5cm layer and in parent material and low distribution proportion in middle layers of a soil profile.Rising elevation promoted the accumulation of soil fine particle fraction in parent material layer.The distribution of coarse particle fraction was higher than that of fine particle fraction in 0-5cm layer.The difference between the coarse particle and fine particle fraction of soil gradually decreased with the soil deepening.There were no obvious effects on total organic carbon,coarse particle organic carbon and fine particle between on western slope and on eastern slope.However,the distribution of mineral organic carbon on profile layers was affected by the aspect of slope.On western slope,the profile vertical distribution of soil mineral organic carbon was similar to that of soil particulate organic carbon,but there were not gradations of soil mineral organic carbon on profile layer level and elevation level on eastern slope.