水土保持学报2017，Vol.31Issue(3)：224-230,238,8.DOI:10.13870/j.cnki.stbcxb.2017.03.038
名山河流域不同土壤类型和土地利用方式下有机碳的分布特征
Distribution of Organic Carbon under Different Soil Types and Utilization Patterns in Mingshan River Watershed
摘要
Abstract
The distribution of soil organic carbon was studied under different soil types and land use patterns,samples were collected in Mingshan River watershed and analysed in the laboratory.The results showed as follows:(1) Organic carbon content of the three types of soil was 17.50-34.70 g/kg,and followed the order of paddy soil ＞ yellow soil ＞ purple soil;From the way of land use,the content of paddy soil organic carbon and active organic carbon were significantly higher than those of the dry land,tea gardens and orchards,soil active organic carbon and soil organic carbon were significantly positively correlated (R2=0.884 6).(2) The content of organic carbon of soil decreased gradually with the increase of soil depth.Soil organic carbon content showed the order of paddy soil ＞ yellow soil ＞ purple soil at the depth of 0-20 cm,and paddy soil ＞ purple soil ＞ yellow soil at the depth of 20-40 cm,and active organic carbon showed a similar pattern.(3) Under different land use patterns,organic carbon content in the surface soil followed the order of paddy field ＞ dry land ＞ tea garden,and that in the subsoils (20-40 cm) was in the order of paddy field ＞ tea garden ＞ dry land.Active organic carbon contents in both in the upper and the lower layers of the paddy field were significantly higher than those of the dry land,orchard and tea garden.It is proved again that active organic carbon is one of the important indicators of organic carbon.(4) Organic carbon content of soil aggregates decreased with the increase of soil depth,at the same time,the organic carbon content of soil aggregates showed a wavy changing trend with the decreasing particle size.Organic carbon content of soil aggregates was positively correlated with total soil organic carbon content.In conclusion,organic carbon contents in the soil and soil aggregates of different particle sizes were influenced by soil types and different utilization pattern,the distribution characteristics of organic carbon in the soil and soil aggregates were different.关键词
土壤有机碳/土壤团聚体/土壤类型/土地利用方式/名山河流域Key words
soil organic carbon/soil aggregate/soil type/land use pattern/Mingshan River watershed分类
农业科技引用本文复制引用
李欣雨,夏建国,鄢广奎,宋承远,李琳佳..名山河流域不同土壤类型和土地利用方式下有机碳的分布特征[J].水土保持学报,2017,31(3):224-230,238,8.基金项目
四川省学术和技术带头人培养基金项目(2014) （2014）
四川农业大学学科建设双支计划项目(2016) （2016）
