苏南丘陵不同林龄杉木林土壤活性有机碳变化特征  

Variation of soil labile organic carbon in different age Chinese fir plantations in south Jiangsu

作　　者：李平[1] 郑阿宝[2] 阮宏华[1] 李莉 沈玉娟[1] 赵琦齐[1] 谢涛[1] 

机构地区：[1]南京林业大学江苏省林业生态工程重点实验室,南京210037 [2]江苏省林业局,南京210036 [3]江苏省溧阳市林业站,江苏溧阳213300

出　　处：《生态学杂志》2011年第4期778-783,共6页Chinese Journal of Ecology

基　　金：国家林业公益性科研专项项目(200804006和200704005/wb02);国家自然科学基金项目(30670313)资助

摘　　要：对江苏苏南地区不同林龄阶段杉木人工林土壤总有机碳、水溶性有机碳、易氧化碳及其与土壤基本理化性质的关系进行了研究,结果表明:随着林龄增加,土壤总有机碳含量呈现先降低后增加的变化,过熟林阶段最高、中龄林阶段最低,水溶性有机碳与易氧化碳含量总体表现出与总有机碳较为一致的变化特征,二者占总有机碳的比例没有稳定变化。2种活性有机碳之间、活性有机碳与总有机碳、全氮、碳氮比呈显著相关,与全硫、土壤水分、pH、容重相关关系不显著,但在不同林龄阶段的表现有所不同。杉木林土壤有机碳在不同林龄阶段可能对森林碳循环起着不同的作用。An investigation was made on the soil total organic carbon（TOC）,water-soluble organic carbon（WSOC）,readily oxidizable carbon（ROC）,and their correlations with soil basic physicochemical properties in different age Chinese fir plantations in south Jiangsu.With the increasing age of the plantations,soil TOC content increased after an initial decrease,being the highest in over-mature stand and the lowest in middle-age stand.Soil WSOC and ROC contents had the same variation trend as soil TOC,and the WSOC/TOC and ROC/TOC ratios had no stable variation.There existed significant correlations between WSOC and ROC and among these two labile organic carbons and TOC,TN,and C/N,but no significant correlations between the labile organic carbons and soil total S,moisture content,pH,and bulk density.However,the correlations were not identical in the different age plantations.The soil organic carbon in different age Chinese fir plantations might play different roles in the carbon cycling of the forest ecosystem.

关 键 词：林龄 杉木人工林 土壤总有机碳 土壤活性有机碳 

分 类 号：S714.5[农业科学—林学]