喀斯特峰丛洼地原生林土壤团聚体有机碳的剖面分布  

Profile distribution of soil aggregates organic carbon in primary forests in Karst cluster-peak depression region

作　　者：卢凌霄 宋同清[1,2] 彭晚霞[1,2] 曾馥平[1,2] 王克林[1,2] 徐云蕾[1,2] 俞孜 刘艳[4] 

机构地区：[1]中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,长沙410125 [2]中国科学院环江喀斯特生态系统观测研究站,广西环江547100 [3]中国科学院研究生院,北京100049 [4]广西水土保持监测总站,南宁530023

出　　处：《应用生态学报》2012年第5期1167-1174,共8页Chinese Journal of Applied Ecology

基　　金：中国科学院“西部行动计划”项目(KZCX2-XB3-10)、中国科学院战略性先导科技专项(XDA05070404,XDA05050205)和中国科学院“西部之光”人才培养计划项目;“十二五”国家科技支撑计划项目(2011BAC09B02);国家自然科学基金项目(31070425,31000224,30970508)资助

摘　　要：以喀斯特峰丛洼地的伊桐、侧柏和菜豆树3个原生林植物群落为对象,分析了土壤团聚体的组成、有机碳及其剖面分布.结果表明:3个植物群落的土壤分布均以>2mm大粒径团聚体为主,约占土壤团聚体总量的76%.土壤总有机碳含量介于12.73～68.66g.kg-1之间,群落类型显著影响土壤有机碳含量及其分布.<1mm小粒径团聚体中的有机碳含量比>2mm团聚体稍高,但大部分土壤有机碳储存在大粒径团聚体中,>2mm团聚体对土壤有机碳的贡献率约70%.2～5和5～8mm团聚体含量与土壤有机碳含量呈显著正相关.提高土壤中2～8mm团聚体的含量能有效增强喀斯特地区土壤固碳能力.伊桐群落2～8mm土壤团聚体的含量及其全土有机碳含量分别达46%和37.62g.kg-1,伊桐更适合作为喀斯特地区生态恢复树种.Soil profiles were collected from three primary forests （Itoa orientalis, Platycladus orien- talis, and Radermachera sinica） in Karst cluster-peak depression region to study the composition of soil aggregates, their organic carbon contents, and the profile distribution of the organic carbon. In the three forests, 〉2 mm soil aggregates were dominant, occupying about 76% of the total. The content of soil total organic carbon ranged from 12.73 to 68.66 g.kg^l , with a significant differ-ence among the forests. The organic carbon content in 〈 1 mm soil aggregates was slightly higher than that in 〉2 mm soil aggregates, but most of soil organic carbon was stored in the soil aggregates with greater particle sizes. About 70% of soil organic carbon came from 〉2 mm soil aggregates. There was a significant positive relationship between the contents of 2-5 and 5-8 mm soil aggre- gates and the content of soil organic carbon. To increase the contents of 2-8 mm soil aggregates could effectively improve the soil carbon sequestration in Karst region. In Itoa orientalis forest, 2-8 mm soil aggregates accounted for 46% of the total, and the content of soil total organic carbon reached to 37.62 g.kg^1 , which implied that Itoa orientalis could be the suitable tree species for the ecological restoration in Karst region.

关 键 词：土壤团聚体土壤有机碳原生林喀斯特峰丛洼地 

分 类 号：S714[农业科学—林学]