小叶章湿地土壤可利用性碳对微生物呼吸的限制作用——三江平原为例(英文)  

Limitation of Available Carbon on Microbial Respiration in the Calamagrostis angustifolia Soil——A Case Study in Sanjiang Plain *

作　　者：徐小锋[1] 宋长春 宋霞[2] 

机构地区：[1]中国科学院东北地理与农业生态研究所,长春130012 [2]中国科学院地理科学与资源研究所,北京101001

出　　处：《中国科学院研究生院学报》2004年第4期538-542,共5页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：theKnowledgeInnovationProgramoftheChineseAcademyofSciences (KZCX1 SW 0 1,KZCX1 SW 19,KZCX3 SW 3 3 2 )

摘　　要：研究了三江平原小叶章湿地土壤中碳的可利用性对土壤中微生物呼吸的限制作用 .结果表明 ,表土和根层土中的可利用性碳显著限制微生物呼吸作用 .在所有的培养土壤中 ,起始时微生物呼吸速率较高 ,随之急剧下降 ,这可能是由于土壤物理化学及生物性质的变化所致 .土壤中有机质低于 1 0 %时 ,可以明显影响碳的可利用指数 ;大于 1 0 %以后就几乎没有影响了 .微生物生物量碳与碳的可利用指数也存在较为显著的正相关关系 .The limitation of carbon availability on microbial respiration was studied in the Calamagrostis angustifolia soil in Sanjiang Plain. The results suggest that carbon availability limits the microbial respiration in root layer soil and subsoil initially, whereas it does not limit the microbial respiration after 1.5 h incubation for recovery from the disturbance in physical, chemical and biological structure caused by sampling from the field, then after 5 h incubation when the labile carbon has been mineralized the available carbon limits the microbial respiration again. At the same time the results show that the soil organic matter affects carbon availability index significantly when its value is lower than 10%, but the effect is little when the soil organic matter is higher than 10%. The microbial biomass carbon is linearly correlated with carbon availability in the Calamagrostis angustifolia soil.

关 键 词：小叶章湿地 土壤有机质 可利用性碳 微生物呼吸 生物量碳 三江平原 物理化学 

分 类 号：S153[农业科学—土壤学]