东北过伐林区蒙古栎天然林土壤有机碳研究  

Soil Organic Carbon in Over-logged Forest Stands of Quercus mongolica in Northeastern China

作　　者：于洋[1] 王海燕[1] 雷相东[2] 张会儒[2] 赵琨[1] 

机构地区：[1]教育部水土保持与荒漠化防治重点实验室,北京林业大学水土保持学院,北京100083 [2]中国林业科学研究院资源信息研究所,北京100091

出　　处：《西北林学院学报》2011年第2期57-62,共6页Journal of Northwest Forestry University

基　　金：国家“十一五”科技支撑计划项目(2006BAD03A0802)

摘　　要：森林土壤有机碳库在维持森林立地生产力以及全球碳平衡过程中起着重要作用。本研究以东北过伐林区蒙古栎天然林为对象,研究不同层次（0~20 cm、20~40 cm和40~60 cm）的土壤有机碳含量和有机碳密度、及其与其他土壤特性的关系。结果表明：（1）蒙古栎林土壤有机碳含量均值为31.48 g.kg-1,0~60 cm土壤剖面有机碳密度为15.76 kg.m-2;土壤有机碳含量和碳密度均随土壤深度增加而显著减少;（2）0~20 cm土层中,除全P和有效P的含量略低,土壤养分含量均较丰富。随着土壤深度的增加,土壤养分含量降低,其在不同土层间的差异显著或极显著（除pH和全K以外）,并且土壤养分变异系数均有不同程度的差异;（3）在0~20 cm,土壤有机碳含量和碳密度均与土壤pH呈显著正相关,与土壤全N、全P和速效K呈极显著正相关;就0~60 cm土壤剖面而言,土壤有机碳含量与土壤密度呈显著负相关,土壤有机碳含量和碳密度均与土壤全N、全P、有效P和速效K呈极显著正相关。Forest soil organic carbon（SOC） is of great importance to maintain the forest site productivity and global carbon balance.Forest stands of Quercus mongolica in the over-logged forest area in northeastern China were selected to study SOC content and SOC density in the soil layers of 0-20 cm,20-40 cm and 40-60 cm.The relationship between SOC and other soil characteristics was also examined.The results showed that：（1） the mean SOC content of Q.mongolica forest was 31.48 g ·kg-1 and SOC density to the depth of 60 cm was 15.76 kg·m-2,with the increase of soil depth,SOC content and density decreased significantly;（2） soil nutrients were rich in the layer of 0-20 cm except for total and available P,with the increase of soil depth,soil nutrients concentrations decreased and significant or very significant differences were found between different soil layers except for soil pH and total K,coefficients of variation（CV） of soil nutrients varied in the soil profile;（3） in the layer of 0-20 cm,SOC content and density had significant positive correlations with soil pH,and very significant positive correlations with soil total N and P as well as available K.In the whole soil profile（0-60 cm）,SOC content had significant negative correlations with soil bulk density.SOC content and density had very significant positive correlations with total N and P as well as available P and K.

关 键 词：过伐林 蒙古栎林 土壤有机碳含量 土壤有机碳密度 土壤养分 

分 类 号：S714.6[农业科学—林学]