开封市城市土壤有机碳含量和密度的变化分析  

Variations of the Content and Density of Urban Soil Organic Carbon in Kaifeng City

作　　者：孙艳丽[1] 马建华[1] 李灿[2] 

机构地区：[1]河南大学资源与环境研究所 [2]洛阳工学院人事处,洛阳471003

出　　处：《河南大学学报（自然科学版）》2008年第5期491-496,共6页Journal of Henan University:Natural Science

基　　金：河南省重点科技攻关项目(72102150029)

摘　　要：城市土壤有机碳是全球碳循环的重要环节，对全球环境变化具有一定的影响．在野外调查和样品分析的基础上，讨论了开封市1994年和2006年土壤有机碳含量和密度的变化．结果表明：（1）2006年土壤表层有机碳含量、密度和削面有机碳密度基本都比1994年有所增加，增幅分别为0．99～28．19g／kg、0．12～23．39kg／m^2和0．39～7．59kg／m^2．（2）各剖面的有机碳含量都随深度的增加而降低．1994年有机碳含量的垂直变化和缓，2006年垂直变化较剧烈．（3）土壤有机碳含量和密度的垂直分布在剖面点之间存在差异．（4）土地利用方式的变化可以改变有机碳在土壤中的贮存与分布．农业土壤向城市土壤的转变，会增加表层有机碳含量并干扰有机碳沿剖面垂直递减的分布规律．Organic carbon in urban soils, a crucial factor in the global carbon cycle, would influence the global environment. On the basis of field investigation and laboratory analysis, SOC and SOCD in Kaifeng City in 1994 and 2006 were studied. The results are as follows： Firstly, the contents of SOC and SOCD in topsoils and SOCD in profiles were higher in 2006 than in 1994, with the increasing range of 0. 99428.19 g/kg,0. 12423.39 kg/m^2and 0.39-7.59 kg/m^2, respectively. Secondly, the contents of SOC decreased with the depth and the variation were gentler in 1994 than in 2006. Thirdly, the variation of SOC and SOCD were different among profiles. Fourthly, the distribution and storage of SOC were influenced by the change of land use. For example, when farming soil was changed into urban soil, the content of SOC increased and the distribution of SOC varied complicatedly.

关 键 词：开封市 城市土壤 有机碳含量 有机碳密度 

分 类 号：S153.6[农业科学—土壤学]