中文摘要：

为研究干旱半干旱地区森林土壤碳、氮分布特征,选取太行山南麓20年生侧柏、刺槐、栓皮栎人工次生林为研究对象,对林下0~60 cm土层的土壤有机碳、全氮、铵态氮、硝态氮含量及土壤物理性质进行测定。结果表明：3种人工林土壤容重随土层深度增加而增大,土壤含水率和孔隙度均表现出随土层深度增加而减少的趋势。3种人工林不同土层的土壤有机碳、氮（全氮、铵态氮、硝态氮）含量均呈现出随土层深度增加而减小的趋势,总体上有机碳和全氮含量均表现为刺槐人工林最高、侧柏人工林最低。3种人工林林下土壤剖面的C/N比值介于6.44~12.00,没有明显差异。3种人工林土壤有机碳含量与全氮、铵态氮、硝态氮（除侧柏人工林）含量均存在极显著相关性。3种人工林土壤含水率与土壤有机碳、全氮、铵态氮、硝态氮（除侧柏人工林）含量呈显著或极显著正相关;而土壤容重与之表现出一定的负相关关系,但仅侧柏人工林的有机碳、铵态氮、硝态氮与土壤容重的相关性达显著水平。

英文摘要：

In order to explore the distribution characteristics of soil carbon and nitrogen in arid and semiarid areas,contents of soil organic carbon（SOC）,total nitrogen（N）,NH＋4-N and NO-3-N and soil physical characteristics were investigated in three 20 year-old artificial forests（Platycladus orientalis,Robinia hispida,Quercus variabili） in southern foot of Taihang mountain.The results showed that with the increase of the soil depth,bulk density of soil increased in three artificial forests; soil moisture content and soil capillary porosity decreased; contents of SOC,N（total N,NH＋4-N and NO-3-N） decreased; overall,for the contents of SOC and total N,Robinia hispida artificial forest was the highest,Platycladus orientalis artificial forest was the lowest.The C / N ratio of soil profiles had no significant differences with the value from6.44 to 12.00.SOC content and soil moisture content were all significantly positively related with the contents of total N,NH＋4-N and NO3-N（except Platycladus orientalis artificial forest） in three artificial forests; the soil bulk density was negatively related with the contents of SOC,total N,NH＋4-N and NO-3-N,but only significantly related with the contents of SOC,NH＋4-N and NO-3-N in soil of Platycladus orientalis artificial forest.