不同年限铁路边坡人工土壤团聚体中碳氮磷分布特征  

Distribution Characteristics of Carbon,Nitrogen and Phosphorus of Soil Aggregates on Railway Slopes of Different Years

作　　者：郭雪姣[1] 艾应伟[1] 王克秀[1] 陈娇[1] 冯春晓[1] 

机构地区：[1]四川大学生命科学学院,生物资源与生态环境教育部重点实验室,成都610064

出　　处：《水土保持学报》2015年第4期207-211,217,共6页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(41171175)

摘　　要：选取四川盆地中部遂渝铁路遂宁站附近的岩石边坡为研究对象,以临近自然边坡为对照,就不同年限铁路边坡和自然边坡土壤团聚体中碳、氮、磷分布特征进行差异性研究。结果表明,有机碳含量在4种边坡土壤团聚体中整体表现为自然边坡〉2003年边坡〉1996年边坡〉2007年边坡;土壤氮含量在4种边坡土壤团聚体中表现为自然边坡〉2003年边坡〉2007年边坡〉1996年边坡。土壤有机碳、氮主要分布在〉5mm,5-3mm,〈0.25mm 3个团聚体粒级。不同粒级中碳、氮和磷的含量分布都表现为随着土壤团聚体粒级的减小而逐渐增加。4种铁路边坡土壤不同粒级团聚体中的C/N随着土壤团聚体粒级的减小而逐渐减小。磷在不同粒级中的含量差异与土壤质地有关。In this study, we selected rock slopes near Suiyu railway station in central Sichuan Basin as research object, and selected neighboring natural slope as control, to study the differences in distribution characteristics of carbon, nitrogen and phosphorus of soil aggregates in railway rock slope of different years and natural slope. The results showed that organic carbon content of soil aggregates in 4 kinds of slopes listed in the following order： natural slope〉slope built in 2003〉slope built in 1996〉slope built in 2007, while the content of soil nitrogen listed in the following order： natural slope〉slope built in 2003〉slope built in 2007〉slope built in 1996. Soil organic carbon and nitrogen were mainly distributed in 〉5 mm soil aggregates, 5 mm to 3 mm soil aggregates and 〈0.25 mm soil aggregates. The content of carbon, nitrogen and phosphorus in soil aggregates of different sizes increased gradually with the decrease of soil aggregate size, while the C/N ratio gradually decreased with the decrease of soil aggregate size. The difference in phosphorus content in soil aggregates of different sizes correlated with soil texture.

关 键 词：铁路边坡 人工土壤 恢复年限 碳氮磷 土壤团聚体 

分 类 号：S158.3[农业科学—土壤学] S152.4[农业科学—农业基础科学]